/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2019 Joyent, Inc.
 */

#include <libxml/parser.h>
#include <libxml/xinclude.h>
#include <sys/fm/protocol.h>
#include <assert.h>
#include <string.h>
#include <strings.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <fm/libtopo.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <topo_file.h>
#include <topo_mod.h>
#include <topo_subr.h>
#include <topo_alloc.h>
#include <topo_parse.h>
#include <topo_error.h>

static tf_rdata_t *topo_xml_walk(topo_mod_t *, tf_info_t *, xmlNodePtr,
    tnode_t *);
static tf_edata_t *enum_attributes_process(topo_mod_t *, xmlNodePtr);
static int enum_run(topo_mod_t *, tf_rdata_t *);
static int fac_enum_run(topo_mod_t *, tnode_t *, const char *);
static int fac_process(topo_mod_t *, xmlNodePtr, tf_rdata_t *, tnode_t *);
static int fac_enum_process(topo_mod_t *, xmlNodePtr, tnode_t *);
static int decorate_nodes(topo_mod_t *, tf_rdata_t *, xmlNodePtr, tnode_t *,
    tf_pad_t **);


int
xmlattr_to_stab(topo_mod_t *mp, xmlNodePtr n, const char *stabname,
    topo_stability_t *rs)
{
	xmlChar *str;
	int rv = 0;

	if (n == NULL) {
		/* If there is no Stability defined, we default to private */
		*rs = TOPO_STABILITY_PRIVATE;
		return (0);
	}
	if ((str = xmlGetProp(n, (xmlChar *)stabname)) == NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
		    "attribute to stability:\n");
		return (topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR));
	}

	if (xmlStrcmp(str, (xmlChar *)Internal) == 0) {
		*rs = TOPO_STABILITY_INTERNAL;
	} else if (xmlStrcmp(str, (xmlChar *)Private) == 0) {
		*rs = TOPO_STABILITY_PRIVATE;
	} else if (xmlStrcmp(str, (xmlChar *)Obsolete) == 0) {
		*rs = TOPO_STABILITY_OBSOLETE;
	} else if (xmlStrcmp(str, (xmlChar *)External) == 0) {
		*rs = TOPO_STABILITY_EXTERNAL;
	} else if (xmlStrcmp(str, (xmlChar *)Unstable) == 0) {
		*rs = TOPO_STABILITY_UNSTABLE;
	} else if (xmlStrcmp(str, (xmlChar *)Evolving) == 0) {
		*rs = TOPO_STABILITY_EVOLVING;
	} else if (xmlStrcmp(str, (xmlChar *)Stable) == 0) {
		*rs = TOPO_STABILITY_STABLE;
	} else if (xmlStrcmp(str, (xmlChar *)Standard) == 0) {
		*rs = TOPO_STABILITY_STANDARD;
	} else {
		xmlFree(str);
		return (topo_mod_seterrno(mp, ETOPO_PRSR_BADSTAB));
	}
	xmlFree(str);
	return (rv);
}

int
xmlattr_to_int(topo_mod_t *mp,
    xmlNodePtr n, const char *propname, uint64_t *value)
{
	xmlChar *str;
	xmlChar *estr;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "xmlattr_to_int(propname=%s)\n",
	    propname);
	if ((str = xmlGetProp(n, (xmlChar *)propname)) == NULL)
		return (topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR));

	errno = 0;
	*value = strtoull((char *)str, (char **)&estr, 0);
	if (errno != 0 || *estr != '\0') {
		/* no conversion was done */
		xmlFree(str);
		return (topo_mod_seterrno(mp, ETOPO_PRSR_BADNUM));
	}
	xmlFree(str);
	return (0);
}

int
xmlattr_to_double(topo_mod_t *mp,
    xmlNodePtr n, const char *propname, double *value)
{
	xmlChar *str;
	xmlChar *estr;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
	    "xmlattr_to_double(propname=%s)\n", propname);
	if ((str = xmlGetProp(n, (xmlChar *)propname)) == NULL)
		return (topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR));

	errno = 0;
	*value = strtold((char *)str, (char **)&estr);
	if (errno != 0 || *estr != '\0') {
		/* full or partial conversion failure */
		xmlFree(str);
		return (topo_mod_seterrno(mp, ETOPO_PRSR_BADNUM));
	}
	xmlFree(str);
	return (0);
}

static int
xmlattr_to_fmri(topo_mod_t *mp,
    xmlNodePtr xn, const char *propname, nvlist_t **rnvl)
{
	xmlChar *str;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "xmlattr_to_fmri(propname=%s)\n",
	    propname);
	if ((str = xmlGetProp(xn, (xmlChar *)propname)) == NULL)
		return (topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR));
	if (topo_mod_str2nvl(mp, (const char *)str, rnvl) < 0) {
		xmlFree(str);
		return (-1);
	}
	xmlFree(str);
	return (0);
}

static topo_type_t
xmlattr_to_type(topo_mod_t *mp, xmlNodePtr xn, xmlChar *attr)
{
	topo_type_t rv;
	xmlChar *str;
	if ((str = xmlGetProp(xn, (xmlChar *)attr)) == NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR, "%s attribute missing",
		    attr);
		(void) topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR);
		return (TOPO_TYPE_INVALID);
	}
	if (xmlStrcmp(str, (xmlChar *)Int32) == 0) {
		rv = TOPO_TYPE_INT32;
	} else if (xmlStrcmp(str, (xmlChar *)UInt32) == 0) {
		rv = TOPO_TYPE_UINT32;
	} else if (xmlStrcmp(str, (xmlChar *)Int64) == 0) {
		rv = TOPO_TYPE_INT64;
	} else if (xmlStrcmp(str, (xmlChar *)UInt64) == 0) {
		rv = TOPO_TYPE_UINT64;
	} else if (xmlStrcmp(str, (xmlChar *)FMRI) == 0) {
		rv = TOPO_TYPE_FMRI;
	} else if (xmlStrcmp(str, (xmlChar *)String) == 0) {
		rv = TOPO_TYPE_STRING;
	} else if (xmlStrcmp(str, (xmlChar *)Double) == 0) {
		rv = TOPO_TYPE_DOUBLE;
	} else if (xmlStrcmp(str, (xmlChar *)Int32_Arr) == 0) {
		rv = TOPO_TYPE_INT32_ARRAY;
	} else if (xmlStrcmp(str, (xmlChar *)UInt32_Arr) == 0) {
		rv = TOPO_TYPE_UINT32_ARRAY;
	} else if (xmlStrcmp(str, (xmlChar *)Int64_Arr) == 0) {
		rv = TOPO_TYPE_INT64_ARRAY;
	} else if (xmlStrcmp(str, (xmlChar *)UInt64_Arr) == 0) {
		rv = TOPO_TYPE_UINT64_ARRAY;
	} else if (xmlStrcmp(str, (xmlChar *)String_Arr) == 0) {
		rv = TOPO_TYPE_STRING_ARRAY;
	} else if (xmlStrcmp(str, (xmlChar *)FMRI_Arr) == 0) {
		rv = TOPO_TYPE_FMRI_ARRAY;
	} else {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "Unrecognized type attribute value '%s'.\n", str);
		(void) topo_mod_seterrno(mp, ETOPO_PRSR_BADTYPE);
		xmlFree(str);
		return (TOPO_TYPE_INVALID);
	}
	xmlFree(str);
	return (rv);
}

static int
xlate_common(topo_mod_t *mp, xmlNodePtr xn, topo_type_t ptype, nvlist_t *nvl,
    const char *name)
{
	int rv;
	uint64_t ui;
	double dbl;
	uint_t i = 0, nelems = 0;
	nvlist_t *fmri;
	xmlChar *str;
	char **strarrbuf;
	void *arrbuf;
	nvlist_t **nvlarrbuf;
	xmlNodePtr cn;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "xlate_common(name=%s)\n", name);
	switch (ptype) {
	case TOPO_TYPE_INT32:
		if (xmlattr_to_int(mp, xn, Value, &ui) < 0)
			return (-1);
		rv = nvlist_add_int32(nvl, name, (int32_t)ui);
		break;
	case TOPO_TYPE_UINT32:
		if (xmlattr_to_int(mp, xn, Value, &ui) < 0)
			return (-1);
		rv = nvlist_add_uint32(nvl, name, (uint32_t)ui);
		break;
	case TOPO_TYPE_INT64:
		if (xmlattr_to_int(mp, xn, Value, &ui) < 0)
			return (-1);
		rv = nvlist_add_int64(nvl, name, (int64_t)ui);
		break;
	case TOPO_TYPE_UINT64:
		if (xmlattr_to_int(mp, xn, Value, &ui) < 0)
			return (-1);
		rv = nvlist_add_uint64(nvl, name, ui);
		break;
	case TOPO_TYPE_DOUBLE:
		if (xmlattr_to_double(mp, xn, Value, &dbl) < 0)
			return (-1);
		rv = nvlist_add_double(nvl, name, dbl);
		break;
	case TOPO_TYPE_FMRI:
		if (xmlattr_to_fmri(mp, xn, Value, &fmri) < 0)
			return (-1);
		rv = nvlist_add_nvlist(nvl, name, fmri);
		nvlist_free(fmri);
		break;
	case TOPO_TYPE_STRING:
		if ((str = xmlGetProp(xn, (xmlChar *)Value)) == NULL)
			return (-1);
		rv = nvlist_add_string(nvl, name, (char *)str);
		xmlFree(str);
		break;
	case TOPO_TYPE_INT32_ARRAY:
	case TOPO_TYPE_UINT32_ARRAY:
	case TOPO_TYPE_INT64_ARRAY:
	case TOPO_TYPE_UINT64_ARRAY:
	case TOPO_TYPE_STRING_ARRAY:
	case TOPO_TYPE_FMRI_ARRAY:
		for (cn = xn->xmlChildrenNode; cn != NULL; cn = cn->next)
			if ((xmlStrcmp(cn->name, (xmlChar *)Propitem) == 0) ||
			    (xmlStrcmp(cn->name, (xmlChar *)Argitem) == 0))
				nelems++;

		if (nelems < 1) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR, "No <propitem> "
			    "or <argitem> elements found for array val");
			return (-1);
		}
		break;
	default:
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "Unrecognized type attribute (ptype = %d)\n", ptype);
		return (topo_mod_seterrno(mp, ETOPO_PRSR_BADTYPE));
	}

	switch (ptype) {
	case TOPO_TYPE_INT32_ARRAY:
		if ((arrbuf = topo_mod_alloc(mp, (nelems * sizeof (int32_t))))
		    == NULL)
			return (topo_mod_seterrno(mp, ETOPO_NOMEM));
		for (cn = xn->xmlChildrenNode; cn != NULL; cn = cn->next) {
			if ((xmlStrcmp(cn->name, (xmlChar *)Propitem) == 0) ||
			    (xmlStrcmp(cn->name, (xmlChar *)Argitem) == 0)) {

				if (xmlattr_to_int(mp, cn, Value, &ui) < 0)
					return (-1);
				((int32_t *)arrbuf)[i++] = (int32_t)ui;
			}
		}

		rv = nvlist_add_int32_array(nvl, name, (int32_t *)arrbuf,
		    nelems);
		topo_mod_free(mp, arrbuf, (nelems * sizeof (int32_t)));
		break;
	case TOPO_TYPE_UINT32_ARRAY:
		if ((arrbuf = topo_mod_alloc(mp, (nelems * sizeof (uint32_t))))
		    == NULL)
			return (topo_mod_seterrno(mp, ETOPO_NOMEM));
		for (cn = xn->xmlChildrenNode; cn != NULL; cn = cn->next) {
			if ((xmlStrcmp(cn->name, (xmlChar *)Propitem) == 0) ||
			    (xmlStrcmp(cn->name, (xmlChar *)Argitem) == 0)) {

				if (xmlattr_to_int(mp, cn, Value, &ui) < 0)
					return (-1);
				((uint32_t *)arrbuf)[i++] = (uint32_t)ui;
			}
		}

		rv = nvlist_add_uint32_array(nvl, name, (uint32_t *)arrbuf,
		    nelems);
		topo_mod_free(mp, arrbuf, (nelems * sizeof (uint32_t)));
		break;
	case TOPO_TYPE_INT64_ARRAY:
		if ((arrbuf = topo_mod_alloc(mp, (nelems * sizeof (int64_t))))
		    == NULL)
			return (topo_mod_seterrno(mp, ETOPO_NOMEM));
		for (cn = xn->xmlChildrenNode; cn != NULL; cn = cn->next) {
			if ((xmlStrcmp(cn->name, (xmlChar *)Propitem) == 0) ||
			    (xmlStrcmp(cn->name, (xmlChar *)Argitem) == 0)) {

				if (xmlattr_to_int(mp, cn, Value, &ui) < 0)
					return (-1);
				((int64_t *)arrbuf)[i++] = (int64_t)ui;
			}
		}

		rv = nvlist_add_int64_array(nvl, name, (int64_t *)arrbuf,
		    nelems);
		topo_mod_free(mp, arrbuf, (nelems * sizeof (int64_t)));
		break;
	case TOPO_TYPE_UINT64_ARRAY:
		if ((arrbuf = topo_mod_alloc(mp, (nelems * sizeof (uint64_t))))
		    == NULL)
			return (topo_mod_seterrno(mp, ETOPO_NOMEM));
		for (cn = xn->xmlChildrenNode; cn != NULL; cn = cn->next) {
			if ((xmlStrcmp(cn->name, (xmlChar *)Propitem) == 0) ||
			    (xmlStrcmp(cn->name, (xmlChar *)Argitem) == 0)) {

				if (xmlattr_to_int(mp, cn, Value, &ui) < 0)
					return (-1);
				((uint64_t *)arrbuf)[i++] = ui;
			}
		}

		rv = nvlist_add_uint64_array(nvl, name, arrbuf,
		    nelems);
		topo_mod_free(mp, arrbuf, (nelems * sizeof (uint64_t)));
		break;
	case TOPO_TYPE_STRING_ARRAY:
		if ((strarrbuf = topo_mod_alloc(mp, (nelems * sizeof (char *))))
		    == NULL)
			return (topo_mod_seterrno(mp, ETOPO_NOMEM));
		for (cn = xn->xmlChildrenNode; cn != NULL; cn = cn->next) {
			if ((xmlStrcmp(cn->name, (xmlChar *)Propitem) == 0) ||
			    (xmlStrcmp(cn->name, (xmlChar *)Argitem) == 0)) {

				if ((str = xmlGetProp(cn, (xmlChar *)Value))
				    == NULL)
					return (-1);

				strarrbuf[i++] =
				    topo_mod_strdup(mp, (const char *)str);
				xmlFree(str);
			}
		}

		rv = nvlist_add_string_array(nvl, name, strarrbuf, nelems);
		topo_mod_strfreev(mp, strarrbuf, nelems);
		break;
	case TOPO_TYPE_FMRI_ARRAY:
		if ((nvlarrbuf = topo_mod_alloc(mp, (nelems *
		    sizeof (nvlist_t *)))) == NULL)
			return (topo_mod_seterrno(mp, ETOPO_NOMEM));
		for (cn = xn->xmlChildrenNode; cn != NULL; cn = cn->next) {
			if ((xmlStrcmp(cn->name, (xmlChar *)Propitem) == 0) ||
			    (xmlStrcmp(cn->name, (xmlChar *)Argitem) == 0)) {

				if ((str = xmlGetProp(cn, (xmlChar *)Value))
				    == NULL)
					return (-1);

				if (topo_mod_str2nvl(mp, (const char *)str,
				    &(nvlarrbuf[i++])) < 0) {
					xmlFree(str);
					return (-1);
				}
				xmlFree(str);
			}
		}

		rv = nvlist_add_nvlist_array(nvl, name, nvlarrbuf,
		    nelems);
		topo_mod_free(mp, nvlarrbuf, (nelems * sizeof (nvlist_t *)));
		break;
	}

	if (rv != 0) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "Nvlist construction failed.\n");
		return (topo_mod_seterrno(mp, ETOPO_NOMEM));
	} else
		return (0);
}

static int
xmlprop_xlate(topo_mod_t *mp, xmlNodePtr xn, nvlist_t *nvl)
{
	topo_type_t ptype;
	xmlChar *str;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "xmlprop_xlate\n");
	if ((str = xmlGetProp(xn, (xmlChar *)Immutable)) != NULL) {
		if (xmlStrcmp(str, (xmlChar *)False) == 0)
			(void) nvlist_add_boolean_value(nvl, INV_IMMUTE,
			    B_FALSE);
		else
			(void) nvlist_add_boolean_value(nvl, INV_IMMUTE,
			    B_TRUE);
		xmlFree(str);
	} else {
		(void) nvlist_add_boolean_value(nvl, INV_IMMUTE, B_TRUE);
	}

	if ((ptype = xmlattr_to_type(mp, xn, (xmlChar *)Type))
	    == TOPO_TYPE_INVALID)
		return (-1);

	if (nvlist_add_int32(nvl, INV_PVALTYPE, ptype) != 0)
		return (-1);

	return (xlate_common(mp, xn, ptype, nvl, INV_PVAL));
}

static int
dependent_create(topo_mod_t *mp,
    tf_info_t *xinfo, tf_pad_t *pad, xmlNodePtr dxn, tnode_t *ptn)
{
	tf_rdata_t *rp, *pp, *np;
	xmlChar *grptype;
	int sibs = 0;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "dependent_create\n");
	if ((grptype = xmlGetProp(dxn, (xmlChar *)Grouping)) == NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "Dependents missing grouping attribute");
		return (topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR));
	}

	pp = NULL;
	if (xmlStrcmp(grptype, (xmlChar *)Siblings) == 0) {
		rp = pad->tpad_sibs;
		sibs++;
	} else if (xmlStrcmp(grptype, (xmlChar *)Children) == 0) {
		rp = pad->tpad_child;
	} else {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "Dependents have bogus grouping attribute");
		xmlFree(grptype);
		return (topo_mod_seterrno(mp, ETOPO_PRSR_BADGRP));
	}
	xmlFree(grptype);
	/* Add processed dependents to the tail of the list */
	while (rp != NULL) {
		pp = rp;
		rp = rp->rd_next;
	}
	if ((np = topo_xml_walk(mp, xinfo, dxn, ptn)) == NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "error within dependent .xml topology: "
		    "%s\n", topo_strerror(topo_mod_errno(mp)));
		return (-1);
	}
	if (pp != NULL)
		pp->rd_next = np;
	else if (sibs == 1)
		pad->tpad_sibs = np;
	else
		pad->tpad_child = np;
	return (0);
}

static int
dependents_create(topo_mod_t *mp,
    tf_info_t *xinfo, tf_pad_t *pad, xmlNodePtr pxn, tnode_t *ptn)
{
	xmlNodePtr cn;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "dependents_create\n");
	for (cn = pxn->xmlChildrenNode; cn != NULL; cn = cn->next) {
		if (xmlStrcmp(cn->name, (xmlChar *)Dependents) == 0) {
			if (dependent_create(mp, xinfo, pad, cn, ptn) < 0)
				return (-1);
		}
	}
	return (0);
}

static int
prop_create(topo_mod_t *mp,
    nvlist_t *pfmri, tnode_t *ptn, const char *gnm, const char *pnm,
    topo_type_t ptype, int flag)
{
	nvlist_t *fmri, **fmriarr;
	uint32_t ui32, *ui32arr;
	uint64_t ui64, *ui64arr;
	int32_t i32, *i32arr;
	int64_t i64, *i64arr;
	double dbl;
	uint_t nelem;
	char *str, **strarr;
	int err, e;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "prop_create(pgrp = %s, "
	    "prop = %s)\n", gnm, pnm);
	switch (ptype) {
	case TOPO_TYPE_INT32:
		e = nvlist_lookup_int32(pfmri, INV_PVAL, &i32);
		break;
	case TOPO_TYPE_UINT32:
		e = nvlist_lookup_uint32(pfmri, INV_PVAL, &ui32);
		break;
	case TOPO_TYPE_INT64:
		e = nvlist_lookup_int64(pfmri, INV_PVAL, &i64);
		break;
	case TOPO_TYPE_UINT64:
		e = nvlist_lookup_uint64(pfmri, INV_PVAL, &ui64);
		break;
	case TOPO_TYPE_DOUBLE:
		e = nvlist_lookup_double(pfmri, INV_PVAL, &dbl);
		break;
	case TOPO_TYPE_FMRI:
		e = nvlist_lookup_nvlist(pfmri, INV_PVAL, &fmri);
		break;
	case TOPO_TYPE_STRING:
		e = nvlist_lookup_string(pfmri, INV_PVAL, &str);
		break;
	case TOPO_TYPE_INT32_ARRAY:
		e = nvlist_lookup_int32_array(pfmri, INV_PVAL, &i32arr, &nelem);
		break;
	case TOPO_TYPE_UINT32_ARRAY:
		e = nvlist_lookup_uint32_array(pfmri, INV_PVAL, &ui32arr,
		    &nelem);
		break;
	case TOPO_TYPE_INT64_ARRAY:
		e = nvlist_lookup_int64_array(pfmri, INV_PVAL, &i64arr,
		    &nelem);
		break;
	case TOPO_TYPE_UINT64_ARRAY:
		e = nvlist_lookup_uint64_array(pfmri, INV_PVAL, &ui64arr,
		    &nelem);
		break;
	case TOPO_TYPE_STRING_ARRAY:
		e = nvlist_lookup_string_array(pfmri, INV_PVAL, &strarr,
		    &nelem);
		break;
	case TOPO_TYPE_FMRI_ARRAY:
		e = nvlist_lookup_nvlist_array(pfmri, INV_PVAL, &fmriarr,
		    &nelem);
		break;
	default:
		e = ETOPO_PRSR_BADTYPE;
	}
	if (e != 0) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "prop_create: prop value lookup failed.\n");
		return (topo_mod_seterrno(mp, e));
	}
	switch (ptype) {
	case TOPO_TYPE_INT32:
		e = topo_prop_set_int32(ptn, gnm, pnm, flag, i32, &err);
		break;
	case TOPO_TYPE_UINT32:
		e = topo_prop_set_uint32(ptn, gnm, pnm, flag, ui32, &err);
		break;
	case TOPO_TYPE_INT64:
		e = topo_prop_set_int64(ptn, gnm, pnm, flag, i64, &err);
		break;
	case TOPO_TYPE_UINT64:
		e = topo_prop_set_uint64(ptn, gnm, pnm, flag, ui64, &err);
		break;
	case TOPO_TYPE_DOUBLE:
		e = topo_prop_set_double(ptn, gnm, pnm, flag, dbl, &err);
		break;
	case TOPO_TYPE_FMRI:
		e = topo_prop_set_fmri(ptn, gnm, pnm, flag, fmri, &err);
		break;
	case TOPO_TYPE_STRING:
		e = topo_prop_set_string(ptn, gnm, pnm, flag, str, &err);
		break;
	case TOPO_TYPE_INT32_ARRAY:
		e = topo_prop_set_int32_array(ptn, gnm, pnm, flag, i32arr,
		    nelem, &err);
		break;
	case TOPO_TYPE_UINT32_ARRAY:
		e = topo_prop_set_uint32_array(ptn, gnm, pnm, flag, ui32arr,
		    nelem, &err);
		break;
	case TOPO_TYPE_INT64_ARRAY:
		e = topo_prop_set_int64_array(ptn, gnm, pnm, flag, i64arr,
		    nelem, &err);
		break;
	case TOPO_TYPE_UINT64_ARRAY:
		e = topo_prop_set_uint64_array(ptn, gnm, pnm, flag, ui64arr,
		    nelem, &err);
		break;
	case TOPO_TYPE_STRING_ARRAY:
		e = topo_prop_set_string_array(ptn, gnm, pnm, flag,
		    (const char **)strarr, nelem, &err);
		break;
	case TOPO_TYPE_FMRI_ARRAY:
		e = topo_prop_set_fmri_array(ptn, gnm, pnm, flag,
		    (const nvlist_t **)fmriarr, nelem, &err);
		break;
	}
	if (e != 0 && err != ETOPO_PROP_DEFD) {

		/*
		 * Some properties may have already been set
		 * in topo_node_bind() or topo_prop_inherit if we are
		 * enumerating from a static .xml file
		 */
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR, "prop set "
		    "failed %s/%s:%s\n", gnm, pnm, topo_strerror(err));
		return (topo_mod_seterrno(mp, err));
	}
	return (0);
}

static int
props_create(topo_mod_t *mp,
    tnode_t *ptn, const char *gnm, nvlist_t **props, int nprops)
{
	topo_type_t ptype;
	boolean_t pim;
	char *pnm;
	int32_t i32;
	int flag;
	int pn;
	int e;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "props_create(pgrp = %s)\n",
	    gnm);
	for (pn = 0; pn < nprops; pn++) {
		e = nvlist_lookup_string(props[pn], INV_PNAME, &pnm);
		if (e != 0) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
			    "props create lookup (%s) failure: %s",
			    INV_PNAME, strerror(e));
			return (topo_mod_seterrno(mp, ETOPO_PRSR_NVPROP));
		}
		e = nvlist_lookup_boolean_value(props[pn], INV_IMMUTE, &pim);
		if (e != 0) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
			    "props create lookup (%s) failure: %s",
			    INV_IMMUTE, strerror(e));
			return (topo_mod_seterrno(mp, ETOPO_PRSR_NVPROP));
		}
		flag = (pim == B_TRUE) ?
		    TOPO_PROP_IMMUTABLE : TOPO_PROP_MUTABLE;

		e = nvlist_lookup_int32(props[pn], INV_PVALTYPE, &i32);
		if (e != 0) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
			    "props create lookup (%s) failure: %s",
			    INV_PVALTYPE, strerror(e));
			return (topo_mod_seterrno(mp, ETOPO_PRSR_NVPROP));
		}
		ptype = (topo_type_t)i32;
		if (prop_create(mp, props[pn], ptn, gnm, pnm, ptype, flag) < 0)
			return (-1);
	}
	return (0);
}

static int
pgroups_create(topo_mod_t *mp, tf_pad_t *pad, tnode_t *ptn)
{
	topo_pgroup_info_t pgi;
	nvlist_t **props;
	char *gnm;
	char *nmstab, *dstab;
	uint32_t rnprops, nprops;
	uint32_t gv;
	int pg;
	int e;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "pgroups_create: %s=%d\n",
	    topo_node_name(ptn), topo_node_instance(ptn));
	for (pg = 0; pg < pad->tpad_pgcnt; pg++) {
		e = nvlist_lookup_string(pad->tpad_pgs[pg],
		    INV_PGRP_NAME, &gnm);
		if (e != 0) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
			    "pad lookup (%s) failed (%s).\n",
			    INV_PGRP_NAME, strerror(errno));
			return (topo_mod_seterrno(mp, ETOPO_PRSR_NVPROP));
		}
		e = nvlist_lookup_string(pad->tpad_pgs[pg],
		    INV_PGRP_NMSTAB, &nmstab);
		if (e != 0) {
			if (e != ENOENT) {
				topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
				    "pad lookup (%s) "
				    "failed.\n", INV_PGRP_NMSTAB);
				return (topo_mod_seterrno(mp,
				    ETOPO_PRSR_NVPROP));
			} else {
				nmstab = TOPO_STABSTR_PRIVATE;
			}
		}
		e = nvlist_lookup_string(pad->tpad_pgs[pg],
		    INV_PGRP_DSTAB, &dstab);
		if (e != 0) {
			if (e != ENOENT) {
				topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
				    "pad lookup (%s) failed.\n",
				    INV_PGRP_DSTAB);
				return (topo_mod_seterrno(mp,
				    ETOPO_PRSR_NVPROP));
			} else {
				dstab = TOPO_STABSTR_PRIVATE;
			}
		}
		e = nvlist_lookup_uint32(pad->tpad_pgs[pg],
		    INV_PGRP_VER, &gv);
		if (e != 0) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
			    "pad lookup (%s) failed.\n",
			    INV_PGRP_VER);
			return (topo_mod_seterrno(mp, ETOPO_PRSR_NVPROP));
		}
		pgi.tpi_name = gnm;
		pgi.tpi_namestab = topo_name2stability(nmstab);
		pgi.tpi_datastab = topo_name2stability(dstab);
		pgi.tpi_version = gv;
		if (topo_pgroup_create(ptn, &pgi, &e) != 0) {
			if (e != ETOPO_PROP_DEFD) {
				topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
				    "pgroups create failure: %s\n",
				    topo_strerror(e));
				return (-1);
			}
		}
		e = nvlist_lookup_uint32(pad->tpad_pgs[pg],
		    INV_PGRP_NPROP, &rnprops);
		/*
		 * The number of properties could be zero if the property
		 * group only contains propmethod declarations
		 */
		if (rnprops > 0) {
			e |= nvlist_lookup_nvlist_array(pad->tpad_pgs[pg],
			    INV_PGRP_ALLPROPS, &props, &nprops);
			if (rnprops != nprops) {
				topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
				    "recorded number of props %d does not "
				    "match number of props recorded %d.\n",
				    rnprops, nprops);
			}
			if (props_create(mp, ptn, gnm, props, nprops) < 0)
				return (-1);
		}
	}
	return (0);
}

static nvlist_t *
pval_record(topo_mod_t *mp, xmlNodePtr xn)
{
	nvlist_t *pnvl = NULL;
	xmlChar *pname;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "pval_record\n");
	if ((pname = xmlGetProp(xn, (xmlChar *)Name)) == NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
		    "propval lacks a name\n");
		(void) topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR);
		return (NULL);
	}
	if (topo_mod_nvalloc(mp, &pnvl, NV_UNIQUE_NAME) < 0) {
		xmlFree(pname);
		return (NULL);
	}
	if (nvlist_add_string(pnvl, INV_PNAME, (char *)pname) < 0) {
		xmlFree(pname);
		nvlist_free(pnvl);
		return (NULL);
	}
	xmlFree(pname);
	/* FMXXX stability of the property name */

	if (xmlprop_xlate(mp, xn, pnvl) < 0) {
		nvlist_free(pnvl);
		return (NULL);
	}
	return (pnvl);
}


struct propmeth_data {
	const char *pg_name;
	const char *prop_name;
	topo_type_t prop_type;
	const char *meth_name;
	topo_version_t meth_ver;
	nvlist_t *arg_nvl;
};

static int
register_method(topo_mod_t *mp, tnode_t *ptn, struct propmeth_data *meth)
{
	int err;

	if (topo_prop_method_version_register(ptn, meth->pg_name,
	    meth->prop_name, meth->prop_type, meth->meth_name, meth->meth_ver,
	    meth->arg_nvl, &err) != 0) {

		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR, "failed to register "
		    "propmethod %s for property \"%s\" in propgrp %s on node "
		    "%s=%d (%s)\n",
		    meth->meth_name, meth->prop_name, meth->pg_name,
		    topo_node_name(ptn), topo_node_instance(ptn),
		    topo_strerror(err));
		return (-1);
	}
	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
	    "registered method %s on %s=%d\n",
	    meth->meth_name, topo_node_name(ptn), topo_node_instance(ptn));

	return (0);
}

static int
pmeth_record(topo_mod_t *mp, const char *pg_name, xmlNodePtr xn, tnode_t *tn,
    const char *rname, const char *ppgrp_name)
{
	nvlist_t *arg_nvl = NULL;
	xmlNodePtr cn;
	xmlChar *meth_name = NULL, *prop_name = NULL;
	xmlChar *arg_name = NULL;
	uint64_t meth_ver, is_mutable = 0, is_nonvolatile = 0;
	topo_type_t prop_type;
	struct propmeth_data meth;
	int ret = 0, err;
	topo_type_t ptype;
	tnode_t *tmp;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "pmeth_record: %s=%d "
	    "(pgrp=%s)\n", topo_node_name(tn), topo_node_instance(tn), pg_name);

	/*
	 * Get propmethod attribute values
	 */
	if ((meth_name = xmlGetProp(xn, (xmlChar *)Name)) == NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "propmethod element lacks a name attribute\n");
		return (topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR));
	}
	if (xmlattr_to_int(mp, xn, Version, &meth_ver) < 0) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "propmethod element lacks version attribute\n");
		ret = topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR);
		goto pmr_done;
	}
	/*
	 * The "mutable" and "nonvoltile" attributes are optional.  If not
	 * specified we default to false (0)
	 */
	(void) xmlattr_to_int(mp, xn, Mutable, &is_mutable);
	(void) xmlattr_to_int(mp, xn, Nonvolatile, &is_nonvolatile);

	if ((prop_name = xmlGetProp(xn, (xmlChar *)Propname)) == NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "propmethod element lacks propname attribute\n");
		ret = topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR);
		goto pmr_done;
	}
	if ((prop_type = xmlattr_to_type(mp, xn, (xmlChar *)Proptype))
	    == TOPO_TYPE_INVALID) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "error decoding proptype attribute\n");
		ret = topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR);
		goto pmr_done;
	}

	/*
	 * Allocate method argument nvlist
	 */
	if (topo_mod_nvalloc(mp, &arg_nvl, NV_UNIQUE_NAME) < 0) {
		ret = topo_mod_seterrno(mp, ETOPO_NOMEM);
		goto pmr_done;
	}

	/*
	 * Iterate through the argval nodes and build the argval nvlist
	 */
	for (cn = xn->xmlChildrenNode; cn != NULL; cn = cn->next) {
		if (xmlStrcmp(cn->name, (xmlChar *)Argval) == 0) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
			    "found argval element\n");
			if ((arg_name = xmlGetProp(cn, (xmlChar *)Name))
			    == NULL) {
				topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
				    "argval element lacks a name attribute\n");
				ret = topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR);
				goto pmr_done;
			}
			if ((ptype = xmlattr_to_type(mp, cn, (xmlChar *)Type))
			    == TOPO_TYPE_INVALID) {
				ret = topo_mod_seterrno(mp, ETOPO_PRSR_BADTYPE);
				xmlFree(arg_name);
				break;
			}
			if (xlate_common(mp, cn, ptype, arg_nvl,
			    (const char *)arg_name) != 0) {
				ret = topo_mod_seterrno(mp, ETOPO_PRSR_BADTYPE);
				xmlFree(arg_name);
				break;
			}
		}
		if (arg_name) {
			xmlFree(arg_name);
			arg_name = NULL;
		}
	}

	if (ret != 0)
		goto pmr_done;

	/*
	 * Register the prop method for all of the nodes in our range
	 */
	meth.pg_name = (const char *)pg_name;
	meth.prop_name = (const char *)prop_name;
	meth.prop_type = prop_type;
	meth.meth_name = (const char *)meth_name;
	meth.meth_ver = meth_ver;
	meth.arg_nvl = arg_nvl;

	/*
	 * If the propgroup element is under a range element, we'll apply
	 * the method to all of the topo nodes at this level with the same
	 * range name.
	 *
	 * Otherwise, if the propgroup element is under a node element
	 * then we'll simply register the method for this node.
	 */
	if (strcmp(ppgrp_name, Range) == 0) {
		for (tmp = tn; tmp != NULL; tmp = topo_child_next(NULL, tmp)) {
			if (strcmp(rname, topo_node_name(tmp)) == 0) {
				if (register_method(mp, tmp, &meth) != 0) {
					ret = topo_mod_seterrno(mp,
					    ETOPO_PRSR_REGMETH);
					goto pmr_done;
				}
				if (is_mutable) {
					if (topo_prop_setmutable(tmp,
					    meth.pg_name, meth.prop_name, &err)
					    != 0) {
						ret = topo_mod_seterrno(mp,
						    ETOPO_PRSR_REGMETH);
						goto pmr_done;
					}
				}
				if (is_nonvolatile) {
					if (topo_prop_setnonvolatile(tmp,
					    meth.pg_name, meth.prop_name, &err)
					    != 0) {
						ret = topo_mod_seterrno(mp,
						    ETOPO_PRSR_REGMETH);
						goto pmr_done;
					}
				}
			}
		}
	} else {
		if (register_method(mp, tn, &meth) != 0) {
			ret = topo_mod_seterrno(mp, ETOPO_PRSR_REGMETH);
			goto pmr_done;
		}
		if (is_mutable) {
			if (topo_prop_setmutable(tn, meth.pg_name,
			    meth.prop_name, &err) != 0) {
				ret = topo_mod_seterrno(mp,
				    ETOPO_PRSR_REGMETH);
				goto pmr_done;
			}
		}
		if (is_nonvolatile) {
			if (topo_prop_setnonvolatile(tn, meth.pg_name,
			    meth.prop_name, &err) != 0) {
				ret = topo_mod_seterrno(mp,
				    ETOPO_PRSR_REGMETH);
				goto pmr_done;
			}
		}
	}

pmr_done:
	if (meth_name)
		xmlFree(meth_name);
	if (prop_name)
		xmlFree(prop_name);
	nvlist_free(arg_nvl);
	return (ret);
}


static int
pgroup_record(topo_mod_t *mp, xmlNodePtr pxn, tnode_t *tn, const char *rname,
    tf_pad_t *rpad, int pi, const char *ppgrp_name)
{
	topo_stability_t nmstab, dstab;
	uint64_t ver;
	xmlNodePtr cn;
	xmlChar *name;
	nvlist_t **apl = NULL;
	nvlist_t *pgnvl = NULL;
	int pcnt = 0;
	int ai = 0;
	int e;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "pgroup_record\n");
	if ((name = xmlGetProp(pxn, (xmlChar *)Name)) == NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "propgroup lacks a name\n");
		return (topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR));
	}
	if (xmlattr_to_int(mp, pxn, Version, &ver) < 0) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "propgroup lacks a version\n");
		return (topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR));
	}
	if (xmlattr_to_stab(mp, pxn, Namestab, &nmstab) < 0) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "propgroup lacks name-stability\n");
		return (topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR));
	}
	if (xmlattr_to_stab(mp, pxn, Datastab, &dstab) < 0) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "propgroup lacks data-stability\n");
		return (topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR));
	}

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "pgroup %s\n", (char *)name);
	for (cn = pxn->xmlChildrenNode; cn != NULL; cn = cn->next) {
		if (xmlStrcmp(cn->name, (xmlChar *)Propval) == 0)
			pcnt++;
	}

	if (topo_mod_nvalloc(mp, &pgnvl, NV_UNIQUE_NAME) < 0) {
		xmlFree(name);
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "failed to allocate propgroup nvlist\n");
		return (topo_mod_seterrno(mp, ETOPO_NOMEM));
	}

	e = nvlist_add_string(pgnvl, INV_PGRP_NAME, (char *)name);
	e |= nvlist_add_uint32(pgnvl, INV_PGRP_NMSTAB, nmstab);
	e |= nvlist_add_uint32(pgnvl, INV_PGRP_DSTAB, dstab);
	e |= nvlist_add_uint32(pgnvl, INV_PGRP_VER, ver);
	e |= nvlist_add_uint32(pgnvl, INV_PGRP_NPROP, pcnt);
	if (pcnt > 0)
		if (e != 0 ||
		    (apl = topo_mod_zalloc(mp, pcnt * sizeof (nvlist_t *)))
		    == NULL) {
			xmlFree(name);
			nvlist_free(pgnvl);
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
			    "failed to allocate nvlist array for properties"
			    "(e=%d)\n", e);
			return (topo_mod_seterrno(mp, ETOPO_NOMEM));
		}
	for (cn = pxn->xmlChildrenNode; cn != NULL; cn = cn->next) {
		if (xmlStrcmp(cn->name, (xmlChar *)Propval) == 0) {
			if (ai < pcnt) {
				if ((apl[ai] = pval_record(mp, cn)) == NULL)
					break;
			}
			ai++;
		} else if (xmlStrcmp(cn->name, (xmlChar *)Prop_meth) == 0) {
			if (pmeth_record(mp, (const char *)name, cn, tn, rname,
			    ppgrp_name) < 0)
				break;
		}
	}
	xmlFree(name);
	if (pcnt > 0) {
		e |= (ai != pcnt);
		e |= nvlist_add_nvlist_array(pgnvl, INV_PGRP_ALLPROPS, apl,
		    pcnt);
		for (ai = 0; ai < pcnt; ai++)
			nvlist_free(apl[ai]);
		topo_mod_free(mp, apl, pcnt * sizeof (nvlist_t *));
		if (e != 0) {
			nvlist_free(pgnvl);
			return (-1);
		}
	}
	rpad->tpad_pgs[pi] = pgnvl;
	return (0);
}

static int
pgroups_record(topo_mod_t *mp, xmlNodePtr pxn, tnode_t *tn, const char *rname,
    tf_pad_t *rpad, const char *ppgrp)
{
	xmlNodePtr cn;
	int pi = 0;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "pgroups_record: pxn->name=%s\n",
	    pxn->name);
	for (cn = pxn->xmlChildrenNode; cn != NULL; cn = cn->next) {
		if (xmlStrcmp(cn->name, (xmlChar *)Propgrp) == 0) {
			if (pgroup_record(mp, cn, tn, rname, rpad, pi++, ppgrp)
			    < 0)
				return (-1);
		}
	}
	return (0);
}

/*
 * psn:	pointer to a "set" XML node
 * key: string to search the set for
 *
 * returns: 1, if the set contains key
 *          0, otherwise
 */
static int
set_contains(topo_mod_t *mp, char *key, char *set)
{
	char *prod;
	int rv = 0;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "set_contains(key = %s, "
	    "setlist = %s)\n", key, set);

	prod = strtok((char *)set, "|");
	if (prod && (strcmp(key, prod) == 0))
		return (1);

	while ((prod = strtok(NULL, "|")))
		if (strcmp(key, prod) == 0)
			return (1);

	return (rv);
}


/*
 * Process the property group and dependents xmlNode children of
 * parent xmlNode pxn.
 */
static int
pad_process(topo_mod_t *mp, tf_rdata_t *rd, xmlNodePtr pxn, tnode_t *ptn,
    tf_pad_t **rpad)
{
	xmlNodePtr cn, gcn, psn, ecn, target;
	xmlNodePtr def_set = NULL;
	tnode_t *ct;
	tf_pad_t *new = *rpad;
	tf_rdata_t tmp_rd;
	int pgcnt = 0;
	int dcnt = 0;
	int ecnt = 0;
	int joined_set = 0, inst;
	xmlChar *set;
	char *key;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
	    "pad_process beneath %s=%d\n", topo_node_name(ptn),
	    topo_node_instance(ptn));
	if (new == NULL) {
		for (cn = pxn->xmlChildrenNode; cn != NULL; cn = cn->next) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
			    "cn->name is %s \n", (char *)cn->name);
			/*
			 * We're iterating through the XML children looking for
			 * four types of elements:
			 *   1) dependents elements
			 *   2) unconstrained pgroup elements
			 *   3) pgroup elements constrained by set elements
			 *   4) enum-method elements for the case that we want
			 *	to post-process a statically defined node
			 */
			if (xmlStrcmp(cn->name, (xmlChar *)Dependents) == 0)
				dcnt++;
			else if (xmlStrcmp(cn->name, (xmlChar *)Propgrp) == 0)
				pgcnt++;
			else if (xmlStrcmp(cn->name, (xmlChar *)Enum_meth)
			    == 0) {
				ecn = cn;
				ecnt++;
			} else if (xmlStrcmp(cn->name, (xmlChar *)Set) == 0) {
				if (joined_set)
					continue;
				set = xmlGetProp(cn, (xmlChar *)Setlist);

				if (mp->tm_hdl->th_product)
					key = mp->tm_hdl->th_product;
				else
					key = mp->tm_hdl->th_platform;

				/*
				 * If it's the default set then we'll store
				 * a pointer to it so that if none of the other
				 * sets apply to our product we can fall
				 * back to this one.
				 */
				if (strcmp((char *)set, "default") == 0)
					def_set = cn;
				else if (set_contains(mp, key, (char *)set)) {
					psn = cn;
					joined_set = 1;
					for (gcn = cn->xmlChildrenNode;
					    gcn != NULL; gcn = gcn->next) {
						if (xmlStrcmp(gcn->name,
						    (xmlChar *)Propgrp) == 0)
							pgcnt++;
					}
				}
				xmlFree(set);
			}
		}
		/*
		 * If we haven't found a set that contains our product AND
		 * a default set exists, then we'll process it.
		 */
		if (!joined_set && def_set) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
			    "Falling back to default set\n");
			joined_set = 1;
			psn = def_set;
			for (gcn = psn->xmlChildrenNode; gcn != NULL;
			    gcn = gcn->next) {
				if (xmlStrcmp(gcn->name, (xmlChar *)Propgrp)
				    == 0)
					pgcnt++;
			}
		}
		topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
		    "pad_process: dcnt=%d, pgcnt=%d, ecnt=%d, joined_set=%d\n",
		    dcnt, pgcnt, ecnt, joined_set);
		/*
		 * If an enum-method element was found, AND we're a child of a
		 * node element, then we invoke the enumerator so that it can do
		 * post-processing of the node.
		 */
		if (ecnt && (strcmp((const char *)pxn->name, Node) == 0)) {
			if ((tmp_rd.rd_einfo = enum_attributes_process(mp, ecn))
			    == NULL)
				return (-1);
			tmp_rd.rd_mod = mp;
			tmp_rd.rd_name = rd->rd_name;
			tmp_rd.rd_min = rd->rd_min;
			tmp_rd.rd_max = rd->rd_max;
			tmp_rd.rd_pn = ptn;
			if (enum_run(mp, &tmp_rd) < 0) {
				/*
				 * Note the failure but continue on
				 */
				topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
				    "pad_process: enumeration failed.\n");
			}
			tf_edata_free(mp, tmp_rd.rd_einfo);
		}
		/*
		 * Here we allocate an element in an intermediate data structure
		 * which keeps track property groups and dependents of the range
		 * currently being processed.
		 *
		 * This structure is referenced in pgroups_record() to create
		 * the actual property groups in the topo tree
		 */
		if ((new = tf_pad_new(mp, pgcnt, dcnt)) == NULL)
			return (-1);

		if (pgcnt > 0) {
			new->tpad_pgs =
			    topo_mod_zalloc(mp, pgcnt * sizeof (nvlist_t *));
			if (new->tpad_pgs == NULL) {
				tf_pad_free(mp, new);
				return (-1);
			}
		}
		/*
		 * If the property groups are contained within a set
		 * then they will be one level lower in the XML tree.
		 */
		if (joined_set)
			target = psn;
		else
			target = pxn;

		/*
		 * If there is no "node" element under the "range"
		 * element, then we need to attach the facility node to
		 * each node in this range.
		 *
		 * Otherwise we only attach it to the current node
		 */
		if (xmlStrcmp(target->name, (xmlChar *)Range) == 0 ||
		    xmlStrcmp(target->name, (xmlChar *)Set) == 0) {
			for (ct = topo_child_first(rd->rd_pn);
			    ct != NULL;
			    ct = topo_child_next(rd->rd_pn, ct)) {

				if (strcmp(topo_node_name(ct),
				    rd->rd_name) != 0)
					continue;

				inst = topo_node_instance(ct);
				if (inst < rd->rd_min || inst > rd->rd_max)
					continue;

				if (fac_enum_process(mp, target, ct) < 0)
					return (-1);

				if (fac_process(mp, target, rd, ct) < 0)
					return (-1);
			}
		} else {
			if (fac_enum_process(mp, target, ptn) < 0)
				return (-1);
			if (fac_process(mp, target, rd, ptn) < 0)
				return (-1);
		}
		if (pgcnt > 0 && pgroups_record(mp, target, ptn, rd->rd_name,
		    new, (const char *)pxn->name) < 0) {
			tf_pad_free(mp, new);
			return (-1);
		}
		*rpad = new;
	}

	if (new->tpad_dcnt > 0)
		if (dependents_create(mp, rd->rd_finfo, new, pxn, ptn) < 0)
			return (-1);

	if (new->tpad_pgcnt > 0)
		if (pgroups_create(mp, new, ptn) < 0)
			return (-1);

	return (0);
}


static int
fac_enum_process(topo_mod_t *mp, xmlNodePtr pn, tnode_t *ptn)
{
	xmlNodePtr cn;
	xmlChar *fprov = NULL;
	int rv = 0;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
	    "fac_enum_process() called for %s=%d\n", topo_node_name(ptn),
	    topo_node_instance(ptn));

	for (cn = pn->xmlChildrenNode; cn != NULL; cn = cn->next) {

		if (xmlStrcmp(cn->name, (xmlChar *)"fac-enum") != 0)
			continue;

		if ((fprov = xmlGetProp(cn, (xmlChar *)Provider)) == NULL)
			goto fenumdone;
		/*
		 * Invoke enum entry point in facility provider which will
		 * cause the facility enumeration node method to be
		 * registered.
		 */
		if (fac_enum_run(mp, ptn, (const char *)fprov) != 0) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
			    "fac_enum_process: enum entry point failed!\n");
			goto fenumdone;
		}
		xmlFree(fprov);
	}
	return (0);
fenumdone:
	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "fac-enum processing failed\n");

	if (fprov != NULL)
		xmlFree(fprov);

	return (rv);
}


static int
fac_process(topo_mod_t *mp, xmlNodePtr pn, tf_rdata_t *rd, tnode_t *ptn)
{
	xmlNodePtr cn;
	xmlChar *fname = NULL, *ftype = NULL, *provider = NULL;
	tnode_t *ntn = NULL;
	tf_idata_t *newi;
	int err;
	topo_pgroup_info_t pgi;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
	    "fac_process() called for %s=%d\n", topo_node_name(ptn),
	    topo_node_instance(ptn));

	for (cn = pn->xmlChildrenNode; cn != NULL; cn = cn->next) {

		if (xmlStrcmp(cn->name, (xmlChar *)Facility) != 0)
			continue;

		if ((fname = xmlGetProp(cn, (xmlChar *)Name)) == NULL)
			goto facdone;

		topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
		    "processing facility node '%s'\n", fname);

		if ((ftype = xmlGetProp(cn, (xmlChar *)Type)) == NULL)
			goto facdone;

		if ((provider = xmlGetProp(cn, (xmlChar *)Provider)) == NULL)
			goto facdone;

		if (xmlStrcmp(ftype, (xmlChar *)Sensor) != 0 &&
		    xmlStrcmp(ftype, (xmlChar *)Indicator) != 0)
			goto facdone;

		if ((ntn = topo_node_facbind(mp, ptn, (char *)fname,
		    (char *)ftype)) == NULL)
			goto facdone;

		pgi.tpi_name = TOPO_PGROUP_FACILITY;
		pgi.tpi_namestab = TOPO_STABILITY_PRIVATE;
		pgi.tpi_datastab = TOPO_STABILITY_PRIVATE;
		pgi.tpi_version = 1;
		if (topo_pgroup_create(ntn, &pgi, &err) != 0) {
			if (err != ETOPO_PROP_DEFD) {
				topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
				    "pgroups create failure: %s\n",
				    topo_strerror(err));
				return (-1);
			}
		}
		/*
		 * Invoke enum entry point in the facility provider module,
		 * which will cause the provider methods to be registered on
		 * this node
		 */
		if (fac_enum_run(mp, ntn, (const char *)provider) != 0) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR, "fac_process: "
			    "enum entry point failed for provider %s!\n",
			    provider);
			goto facdone;
		}

		if ((newi = tf_idata_new(mp, 0, ntn)) == NULL)
			goto facdone;

		if (tf_idata_insert(&rd->rd_instances, newi) < 0)
			goto facdone;

		if (pad_process(mp, rd, cn, ntn, &newi->ti_pad) < 0)
			goto facdone;

		topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "done with "
		    "facility %s=%s.\n", ftype, fname);

		xmlFree(ftype);
		xmlFree(fname);
		xmlFree(provider);
	}

	return (0);

facdone:
	topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR, "facility processing failed\n");

	if (ftype != NULL)
		xmlFree(ftype);
	if (fname != NULL)
		xmlFree(fname);
	if (provider != NULL)
		xmlFree(provider);
	if (ntn != NULL)
		topo_node_unbind(ntn);

	return (0);
}

static int
node_process(topo_mod_t *mp, xmlNodePtr nn, tf_rdata_t *rd)
{
	xmlChar *str;
	topo_instance_t inst;
	tf_idata_t *newi;
	tnode_t *ntn;
	uint64_t ui;
	int rv = -1;
	int s = 0;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
	    "node_process %s\n", rd->rd_name);

	if (xmlattr_to_int(mp, nn, Instance, &ui) < 0)
		goto nodedone;
	inst = (topo_instance_t)ui;

	if ((str = xmlGetProp(nn, (xmlChar *)Static)) != NULL) {
		if (xmlStrcmp(str, (xmlChar *)True) == 0)
			s = 1;
		xmlFree(str);
	}

	if (s == 0) {
		if (topo_mod_enumerate(rd->rd_mod, rd->rd_pn,
		    rd->rd_finfo->tf_scheme, rd->rd_name, inst, inst,
		    s == 1 ? &s : NULL) < 0)
			goto nodedone;
	}
	ntn = topo_node_lookup(rd->rd_pn, rd->rd_name, inst);

	if (ntn == NULL) {

		/*
		 * If this is a static node declaration, we can
		 * ignore the lookup failure and continue
		 * processing.  Otherwise, something
		 * went wrong during enumeration
		 */
		if (s == 1)
			rv = 0;
		goto nodedone;
	}
	if ((newi = tf_idata_new(mp, inst, ntn)) == NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "node_process: tf_idata_new failed.\n");
		goto nodedone;
	}
	if (tf_idata_insert(&rd->rd_instances, newi) < 0) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "node_process: tf_idata_insert failed.\n");
		goto nodedone;
	}
	if (pad_process(mp, rd, nn, ntn, &newi->ti_pad) < 0)
		goto nodedone;
	if (fac_process(mp, nn, rd, ntn) < 0)
		goto nodedone;
	rv = 0;
nodedone:
	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "done with node %s.\n",
	    rd->rd_name);
	return (rv);
}

static tf_edata_t *
enum_attributes_process(topo_mod_t *mp, xmlNodePtr en)
{
	tf_edata_t *einfo;
	uint64_t ui;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "enum_attributes_process\n");
	if ((einfo = topo_mod_zalloc(mp, sizeof (tf_edata_t))) == NULL) {
		(void) topo_mod_seterrno(mp, ETOPO_NOMEM);
		return (NULL);
	}
	einfo->te_name = (char *)xmlGetProp(en, (xmlChar *)Name);
	if (einfo->te_name == NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "Enumerator name attribute missing.\n");
		(void) topo_mod_seterrno(mp, ETOPO_PRSR_NOATTR);
		goto enodedone;
	}

	/*
	 * Check for recursive enumeration
	 */
	if (strcmp(einfo->te_name, mp->tm_name) == 0) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "Recursive enumeration detected for %s\n",
		    einfo->te_name);
		(void) topo_mod_seterrno(mp, ETOPO_ENUM_RECURS);
		goto enodedone;
	}
	if (xmlattr_to_int(mp, en, Version, &ui) < 0)
		goto enodedone;
	einfo->te_vers = (int)ui;

	return (einfo);

enodedone:
	if (einfo->te_name != NULL)
		xmlFree(einfo->te_name);
	topo_mod_free(mp, einfo, sizeof (tf_edata_t));
	return (NULL);
}

static int
enum_run(topo_mod_t *mp, tf_rdata_t *rd)
{
	topo_hdl_t *thp = mp->tm_hdl;
	int e = -1;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "enum_run\n");
	/*
	 * Check if the enumerator module is already loaded.
	 * Module loading is single-threaded at this point so there's
	 * no need to worry about the module going away or bumping the
	 * ref count.
	 */
	if ((rd->rd_mod = topo_mod_lookup(thp, rd->rd_einfo->te_name,
	    0)) == NULL) {
		if ((rd->rd_mod = topo_mod_load(mp, rd->rd_einfo->te_name,
		    rd->rd_einfo->te_vers)) == NULL) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
			    "enum_run: mod_load of %s failed: %s.\n",
			    rd->rd_einfo->te_name,
			    topo_strerror(topo_mod_errno(mp)));
			(void) topo_hdl_seterrno(thp, topo_mod_errno(mp));
			return (e);
		}
	}
	/*
	 * We're live, so let's enumerate.
	 */
	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "enumerate request. (%s)\n",
	    rd->rd_einfo->te_name);
	e = topo_mod_enumerate(rd->rd_mod, rd->rd_pn, rd->rd_einfo->te_name,
	    rd->rd_name, rd->rd_min, rd->rd_max, NULL);
	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "back from enumeration. %d\n",
	    e);
	if (e != 0) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "Enumeration failed (%s)\n",
		    topo_strerror(topo_mod_errno(mp)));
		(void) topo_hdl_seterrno(thp, EMOD_PARTIAL_ENUM);
		return (topo_mod_seterrno(mp, EMOD_PARTIAL_ENUM));
	}
	return (e);
}

static int
fac_enum_run(topo_mod_t *mp, tnode_t *node, const char *name)
{
	topo_hdl_t *thp = mp->tm_hdl;
	topo_mod_t *fmod;
	int e = -1;

	topo_dprintf(thp, TOPO_DBG_XML, "fac_enum_run\n");
	/*
	 * Check if the enumerator module is already loaded.
	 * Module loading is single-threaded at this point so there's
	 * no need to worry about the module going away or bumping the
	 * ref count.
	 */
	if ((fmod = topo_mod_lookup(thp, name, 0)) == NULL) {
		if ((fmod = topo_mod_load(mp, name, TOPO_VERSION)) == NULL) {
			topo_dprintf(thp, TOPO_DBG_ERR,
			    "fac_enum_run: mod_load of %s failed: %s.\n",
			    name, topo_strerror(topo_mod_errno(mp)));
			(void) topo_hdl_seterrno(thp, topo_mod_errno(mp));
			return (e);
		}
	}
	/*
	 * We're live, so let's enumerate.
	 */
	topo_dprintf(thp, TOPO_DBG_XML, "fac enumerate request. (%s)\n", name);
	e = topo_mod_enumerate(fmod, node, name, name, 0, 0, NULL);
	topo_dprintf(thp, TOPO_DBG_XML, "back from enumeration. %d\n", e);
	if (e != 0) {
		topo_dprintf(thp, TOPO_DBG_ERR,
		    "Facility provider enumeration failed (%s)\n",
		    topo_strerror(topo_mod_errno(mp)));
		(void) topo_hdl_seterrno(thp, EMOD_PARTIAL_ENUM);
		return (topo_mod_seterrno(mp, EMOD_PARTIAL_ENUM));
	}
	return (e);
}

int
decorate_nodes(topo_mod_t *mp, tf_rdata_t *rd, xmlNodePtr pxn, tnode_t *ptn,
    tf_pad_t **rpad)
{
	tnode_t *ctn;

	ctn = topo_child_first(ptn);
	while (ctn != NULL) {
		/* Only care about instances within the range */
		if (strcmp(topo_node_name(ctn), rd->rd_name) != 0) {
			ctn = topo_child_next(ptn, ctn);
			continue;
		}
		if (pad_process(mp, rd, pxn, ctn, rpad) < 0)
			return (-1);
		if (decorate_nodes(mp, rd, pxn, ctn, rpad) < 0)
			return (-1);
		ctn = topo_child_next(ptn, ctn);
	}
	return (0);
}

int
topo_xml_range_process(topo_mod_t *mp, xmlNodePtr rn, tf_rdata_t *rd)
{
	/*
	 * The range may have several children xmlNodes, that may
	 * represent the enumeration method, property groups,
	 * dependents, nodes or services.
	 */
	xmlNodePtr cn, enum_node = NULL, pmap_node = NULL;
	xmlChar *pmap_name;
	tnode_t *ct;
	int e, ccnt = 0;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "topo_xml_range_process\n"
	    "process %s range beneath %s\n", rd->rd_name,
	    topo_node_name(rd->rd_pn));

	e = topo_node_range_create(mp,
	    rd->rd_pn, rd->rd_name, rd->rd_min, rd->rd_max);
	if (e != 0 && topo_mod_errno(mp) != EMOD_NODE_DUP) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
		    "Range create failed due to %s.\n",
		    topo_strerror(topo_mod_errno(mp)));
		return (-1);
	}

	/*
	 * Before we process any of the other child xmlNodes, we iterate through
	 * the children and looking for either enum-method or propmap elements.
	 */
	for (cn = rn->xmlChildrenNode; cn != NULL; cn = cn->next)
		if (xmlStrcmp(cn->name, (xmlChar *)Enum_meth) == 0)
			enum_node = cn;
		else if (xmlStrcmp(cn->name, (xmlChar *)Propmap) == 0)
			pmap_node = cn;

	/*
	 * If we found an enum-method element, process it first
	 */
	if (enum_node != NULL) {
		if ((rd->rd_einfo = enum_attributes_process(mp, enum_node))
		    == NULL)
			return (-1);
		if (enum_run(mp, rd) < 0) {
			/*
			 * Note the failure but continue on
			 */
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
			    "Enumeration failed.\n");
		}
	}

	/*
	 * Next, check if a propmap element was found and if so, load it in
	 * and parse it.
	 */
	if (pmap_node != NULL) {
		topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "found a propmap "
		    "element\n");
		if ((pmap_name = xmlGetProp(pmap_node, (xmlChar *)Name))
		    == NULL) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
			    "propmap element missing name attribute.\n");
		} else {
			if (topo_file_load(mp, rd->rd_pn,
			    (const char *)pmap_name,
			    rd->rd_finfo->tf_scheme, 1) < 0) {

				topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
				    "topo_xml_range_process: topo_file_load"
				    "failed: %s.\n",
				    topo_strerror(topo_mod_errno(mp)));
			}
			xmlFree(pmap_name);
		}
	}

	/* Now look for nodes, i.e., hard instances */
	for (cn = rn->xmlChildrenNode; cn != NULL; cn = cn->next) {
		if (xmlStrcmp(cn->name, (xmlChar *)Node) == 0) {
			if (node_process(mp, cn, rd) < 0) {
				topo_dprintf(mp->tm_hdl, TOPO_DBG_ERR,
				    "node processing failed: %s.\n",
				    topo_strerror(topo_mod_errno(mp)));
				return (topo_mod_seterrno(mp,
				    EMOD_PARTIAL_ENUM));
			}
			ccnt++;
		}
	}

	/*
	 * Finally, process the property groups and dependents
	 *
	 * If the TF_PROPMAP flag is set for the XML file we're currently
	 * processing, then this XML file was loaded via propmap.  In that case
	 * we call a special routine to recursively apply the propgroup settings
	 * to all of nodes in this range
	 */
	if (rd->rd_finfo->tf_flags & TF_PROPMAP)
		(void) decorate_nodes(mp, rd, rn, rd->rd_pn, &rd->rd_pad);
	else {
		ct = topo_child_first(rd->rd_pn);
		while (ct != NULL) {
			/* Only care about instances within the range */
			if (strcmp(topo_node_name(ct), rd->rd_name) != 0) {
				ct = topo_child_next(rd->rd_pn, ct);
				continue;
			}
			if (pad_process(mp, rd, rn, ct, &rd->rd_pad)
			    < 0)
				return (-1);

			if (fac_process(mp, rn, rd, ct) < 0)
				return (-1);

			ct = topo_child_next(rd->rd_pn, ct);
			ccnt++;
		}
	}

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "topo_xml_range_process: end "
	    "range process %s\n", rd->rd_name);

	return (0);
}

static tf_rdata_t *
topo_xml_walk(topo_mod_t *mp,
    tf_info_t *xinfo, xmlNodePtr croot, tnode_t *troot)
{
	xmlNodePtr curr, def_set = NULL;
	tf_rdata_t *rr, *pr, *rdp;
	xmlChar *set;
	char *key;
	int joined_set = 0;

	topo_dprintf(mp->tm_hdl, TOPO_DBG_XML, "topo_xml_walk\n");
	rr = pr = NULL;
	/*
	 * First iterate through all the XML nodes at this level to look for
	 * set nodes.
	 */
	for (curr = croot->xmlChildrenNode; curr != NULL; curr = curr->next) {
		if (curr->name == NULL) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
			    "topo_xml_walk: Ignoring nameless xmlnode\n");
			continue;
		}
		if (xmlStrcmp(curr->name, (xmlChar *)Set) == 0) {
			if (joined_set)
				continue;

			set = xmlGetProp(curr, (xmlChar *)Setlist);

			if (mp->tm_hdl->th_product)
				key = mp->tm_hdl->th_product;
			else
				key = mp->tm_hdl->th_platform;

			/*
			 * If it's the default set then we'll store
			 * a pointer to it so that if none of the other
			 * sets apply to our product we can fall
			 * back to this one.
			 */
			if (strcmp((char *)set, "default") == 0)
				def_set = curr;
			else if (set_contains(mp, key, (char *)set)) {
				joined_set = 1;
				if ((rdp = topo_xml_walk(mp, xinfo, curr,
				    troot)) == NULL) {
					topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
					    "topo_xml_walk: failed1\n");
				} else {
					if (pr == NULL) {
						rr = pr = rdp;
					} else {
						pr->rd_next = rdp;
						pr = rdp;
					}
					rr->rd_cnt++;
				}
			}
			xmlFree(set);
		}
	}
	/*
	 * If we haven't found a set that contains our product AND a default set
	 * exists, then we'll process it.
	 */
	if (!joined_set && def_set) {
		if ((rdp = topo_xml_walk(mp, xinfo, def_set, troot)) == NULL) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
			    "topo_xml_walk: failed2\n");
		}
		if (pr == NULL) {
			rr = pr = rdp;
		} else {
			pr->rd_next = rdp;
			pr = rdp;
		}
		rr->rd_cnt++;
	}
	/*
	 * Now we're interested in children xmlNodes of croot tagged
	 * as 'ranges'.  These define what topology nodes may exist, and need
	 * to be verified.
	 */
	for (curr = croot->xmlChildrenNode; curr != NULL; curr = curr->next) {
		if (curr->name == NULL) {
			topo_dprintf(mp->tm_hdl, TOPO_DBG_XML,
			    "topo_xml_walk: Ignoring nameless xmlnode\n");
			continue;
		}
		if (xmlStrcmp(curr->name, (xmlChar *)Range) != 0)
			continue;
		if ((rdp = tf_rdata_new(mp, xinfo, curr, troot)) == NULL) {
			/*
			 * Range processing error, continue walk
			 */
			continue;
		}
		if (pr == NULL) {
			rr = pr = rdp;
		} else {
			pr->rd_next = rdp;
			pr = rdp;
		}
		rr->rd_cnt++;
	}

	return (rr);
}

/*
 *  Convert parsed xml topology description into topology nodes
 */
int
topo_xml_enum(topo_mod_t *tmp, tf_info_t *xinfo, tnode_t *troot)
{
	xmlNodePtr xroot;

	topo_dprintf(tmp->tm_hdl, TOPO_DBG_XML, "topo_xml_enum\n");

	if ((xroot = xmlDocGetRootElement(xinfo->tf_xdoc)) == NULL) {
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
		    "Couldn't get root xmlNode.\n");
		return (-1);
	}
	if ((xinfo->tf_rd = topo_xml_walk(tmp, xinfo, xroot, troot)) == NULL) {
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
		    "error within .xml topology: %s\n",
		    topo_strerror(topo_mod_errno(tmp)));
		return (-1);
	}
	return (0);
}

/*
 * Load an XML tree from filename and read it into a DOM parse tree.
 */
static tf_info_t *
txml_file_parse(topo_mod_t *tmp,
    int fd, const char *filenm, const char *escheme)
{
	xmlValidCtxtPtr vcp;
	xmlNodePtr cursor;
	xmlDocPtr document;
	xmlDtdPtr dtd = NULL;
	xmlChar *scheme = NULL;
	char *dtdpath = NULL;
	int readflags = 0;
	tf_info_t *r;
	int e, validate = 0;

	topo_dprintf(tmp->tm_hdl, TOPO_DBG_XML,
	    "txml_file_parse(filenm=%s, escheme=%s)\n", filenm, escheme);

	/*
	 * Since topologies can XInclude other topologies, and libxml2
	 * doesn't do DTD-based validation with XInclude, by default
	 * we don't validate topology files.  One can force
	 * validation, though, by creating a TOPOXML_VALIDATE
	 * environment variable and creating a TOPO_DTD environment
	 * variable with the path to the DTD against which to validate.
	 */
	if (getenv("TOPOXML_VALIDATE") != NULL) {
		dtdpath = getenv("TOPO_DTD");
		if (dtdpath != NULL)
			xmlLoadExtDtdDefaultValue = 0;
		validate = 1;
	}

	/*
	 * Splat warnings and errors related to parsing the topology
	 * file if the TOPOXML_PERROR environment variable exists.
	 */
	if (getenv("TOPOXML_PERROR") == NULL)
		readflags = XML_PARSE_NOERROR | XML_PARSE_NOWARNING;

	if ((document = xmlReadFd(fd, filenm, NULL, readflags)) == NULL) {
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
		    "txml_file_parse: couldn't parse document.\n");
		return (NULL);
	}

	/*
	 * Verify that this is a document type we understand.
	 */
	if ((dtd = xmlGetIntSubset(document)) == NULL) {
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
		    "document has no DTD.\n");
		xmlFreeDoc(document);
		return (NULL);
	}

	if (strcmp((const char *)dtd->SystemID, TOPO_DTD_PATH) != 0) {
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
		    "document DTD unknown; bad topology file\n");
		xmlFreeDoc(document);
		return (NULL);
	}

	if ((cursor = xmlDocGetRootElement(document)) == NULL) {
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR, "document is empty.\n");
		xmlFreeDoc(document);
		return (NULL);
	}

	/*
	 * Make sure we're looking at a topology description in the
	 * expected scheme.
	 */
	if (xmlStrcmp(cursor->name, (xmlChar *)Topology) != 0) {
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
		    "document is not a topology description.\n");
		xmlFreeDoc(document);
		return (NULL);
	}
	if ((scheme = xmlGetProp(cursor, (xmlChar *)Scheme)) == NULL) {
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
		    "topology lacks a scheme.\n");
		(void) topo_mod_seterrno(tmp, ETOPO_PRSR_NOATTR);
		xmlFreeDoc(document);
		return (NULL);
	}
	if (xmlStrcmp(scheme, (xmlChar *)escheme) != 0) {
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
		    "topology in unrecognized scheme, %s, expecting %s\n",
		    scheme, escheme);
		(void) topo_mod_seterrno(tmp, ETOPO_PRSR_BADSCH);
		xmlFree(scheme);
		xmlFreeDoc(document);
		return (NULL);
	}

	if (dtdpath != NULL) {
		dtd = xmlParseDTD(NULL, (xmlChar *)dtdpath);
		if (dtd == NULL) {
			topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
			    "Could not parse DTD \"%s\".\n",
			    dtdpath);
			xmlFree(scheme);
			xmlFreeDoc(document);
			return (NULL);
		}

		if (document->extSubset != NULL)
			xmlFreeDtd(document->extSubset);

		document->extSubset = dtd;
	}

	if (xmlXIncludeProcessFlags(document, XML_PARSE_XINCLUDE) == -1) {
		xmlFree(scheme);
		xmlFreeDoc(document);
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
		    "couldn't handle XInclude statements in document\n");
		return (NULL);
	}

	if (validate) {
		if ((vcp = xmlNewValidCtxt()) == NULL) {
			xmlFree(scheme);
			xmlFreeDoc(document);
			return (NULL);
		}
		vcp->warning = xmlParserValidityWarning;
		vcp->error = xmlParserValidityError;

		e = xmlValidateDocument(vcp, document);

		xmlFreeValidCtxt(vcp);

		if (e == 0)
			topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
			    "Document is not valid.\n");
	}

	if ((r = tf_info_new(tmp, document, scheme)) == NULL) {
		xmlFree(scheme);
		xmlFreeDoc(document);
		return (NULL);
	}

	xmlFree(scheme);
	scheme = NULL;
	return (r);
}

tf_info_t *
topo_xml_read(topo_mod_t *tmp, const char *path, const char *escheme)
{
	int fd;
	tf_info_t *tip;

	if ((fd = open(path, O_RDONLY)) < 0) {
		topo_dprintf(tmp->tm_hdl, TOPO_DBG_ERR,
		    "failed to open %s for reading\n", path);
		return (NULL);
	}
	tip = txml_file_parse(tmp, fd, path, escheme);
	(void) close(fd);
	return (tip);
}