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<a href="http://www.xmlsoft.org/html/libxml-xmlIO.html#xmlRegisterInputCallbacks" rel="nofollow">xmlRegisterInputCallbacks</a> is what you're probably looking for. The advantage, they let you construct some kind of a virtual I/O layer. The disadvantage, inputcallbacks are set globally (there is however <a href="http://www.xmlsoft.org/html/libxml-xmlIO.html#xmlPopInputCallbacks" rel="nofollow">xmlPopInputCallbacks</a> and <a href="http://www.xmlsoft.org/html/libxml-xmlIO.html#xmlCleanupInputCallbacks" rel="nofollow">xmlCleanupInputCallbacks</a>). The code below (built upon code from <a href="http://knol2share.blogspot.be/2009/05/validate-xml-against-xsd-in-c.html" rel="nofollow">http://knol2share.blogspot.be</a>) demonstrates the use of <a href="http://www.xmlsoft.org/html/libxml-xmlIO.html#xmlCleanupInputCallbacks" rel="nofollow">xmlRegisterInputCallbacks</a>. All xml and xsd files are loaded from the file system, except when the URI contains "DataTypes.xsd" the schema is fetched from a string. (since schemaLocation is only a hint one could for example prefix schema's "test.xsd": the main xml schema (please ignore the reference to peacelane.org, namespaces are from a hobby project, just occurred to me now www.peacelane.org might exist, apparently it does...) <pre class="lang-xml prettyprint-override"><code><schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://peacelane.org/ApplianceType/config/45/LIGHTING1/ARC" xmlns:dt="http://peacelane.org/ApplianceType/config/45/DataTypes" targetNamespace="http://peacelane.org/ApplianceType/config/45/LIGHTING1/ARC" elementFormDefault="qualified"> <import namespace="http://peacelane.org/ApplianceType/config/45/DataTypes" schemaLocation="DataTypes.xsd" /> <complexType name="ConfigType"> <sequence> <element name="housecode" type="dt:char" /> </sequence> </complexType> <element name="Config" type="tns:ConfigType"/> </schema> </code></pre> "test.xml": a test xml to validate <pre class="lang-xml prettyprint-override"><code><?xml version="1.0"?> <Config xmlns="http://peacelane.org/ApplianceType/config/45/LIGHTING1/ARC"> <housecode>A</housecode> </Config> </code></pre> "main.c": the actual code (update the paths for "XMLFileName" and "XSDFileName") <pre class="lang-c prettyprint-override"><code>#define LIBXML_SCHEMAS_ENABLED #include <libxml/xmlschemastypes.h> #include <stdio.h> static const char *databaseSchema = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" " <schema elementFormDefault=\"qualified\" xmlns:tns=\"http://peacelane.org/ApplianceType/config/45/DataTypes\" targetNamespace=\"http://peacelane.org/ApplianceType/config/45/DataTypes\" xmlns=\"http://www.w3.org/2001/XMLSchema\">" " <simpleType name=\"char\">" " <restriction base=\"string\">" " <length value=\"1\" />" " </restriction>" " </simpleType>" " </schema>"; //----------------------------------------------------------------------------- //-- SQL Callbacks (~ simulated db actions) //----------------------------------------------------------------------------- static void* sqlOpen(const char * URI) { return ((void *) databaseSchema ); } static int sqlClose(void * context) { return (0); } static int sqlRead(void * context, char * buffer, int len) { const char* result= (const char *) context; int rlen = strlen(result); memcpy(buffer, result, rlen); return rlen +1; } static int sqlMatch(const char * URI) { if ((URI != NULL )&& (strstr(URI, "DataTypes.xsd") != NULL) )return 1; return 0; } //----------------------------------------------------------------------------- //-- File callbacks //----------------------------------------------------------------------------- static void* fileOpen(const char * URI) { if (URI == NULL ) return (NULL ); FILE* fh = fopen(URI, "rt"); return ((void *) fh); } static int fileClose(void * context) { FILE* fh = (FILE*) context; if (fh != NULL ) fclose(fh); return (0); } static int fileRead(void * context, char * buffer, int len) { FILE* fh = (FILE*) context; fseek(fh, 0L, SEEK_END); long flen = ftell(fh); rewind(fh); if (buffer != NULL ) fread(buffer, flen, 1, fh); return flen + 1; } static int fileMatch(const char * URI) { if ((URI != NULL )) if (strstr(URI, "DataTypes.xsd") == NULL ) { return (1); } return (0); } //----------------------------------------------------------------------------- //-- Main //----------------------------------------------------------------------------- int main(int argc, char *argv[]) { xmlDocPtr doc; xmlSchemaPtr schema = NULL; xmlSchemaParserCtxtPtr ctxt; char *XMLFileName = "/home/dogguts/Projects/libxml2tests/xsdparse/Debug/test.xml"; char *XSDFileName = "/home/dogguts/Projects/libxml2tests/xsdparse/Debug/test.xsd"; xmlLineNumbersDefault(1); if (xmlRegisterInputCallbacks(fileMatch, fileOpen, fileRead, fileClose) < 0) { fprintf(stderr, "failed to register File handler\n"); exit(1); } if (xmlRegisterInputCallbacks(sqlMatch, sqlOpen, sqlRead, sqlClose) < 0) { fprintf(stderr, "failed to register SQL handler\n"); exit(1); } ctxt = xmlSchemaNewParserCtxt(XSDFileName); xmlSchemaSetParserErrors(ctxt, (xmlSchemaValidityErrorFunc) fprintf, (xmlSchemaValidityWarningFunc) fprintf, stderr); schema = xmlSchemaParse(ctxt); xmlSchemaFreeParserCtxt(ctxt); xmlSchemaDump(stdout, schema); doc = xmlReadFile(XMLFileName, NULL, 0); if (doc == NULL ) { fprintf(stderr, "Could not parse %s\n", XMLFileName); } else { xmlSchemaValidCtxtPtr ctxt; int ret; ctxt = xmlSchemaNewValidCtxt(schema); xmlSchemaSetValidErrors(ctxt, (xmlSchemaValidityErrorFunc) fprintf, (xmlSchemaValidityWarningFunc) fprintf, stderr); ret = xmlSchemaValidateDoc(ctxt, doc); if (ret == 0) { printf("%s validates\n", XMLFileName); } else if (ret > 0) { printf("%s fails to validate\n", XMLFileName); } else { printf("%s validation generated an internal error\n", XMLFileName); } xmlSchemaFreeValidCtxt(ctxt); xmlFreeDoc(doc); } if (schema != NULL ) xmlSchemaFree(schema); xmlSchemaCleanupTypes(); xmlCleanupParser(); xmlMemoryDump(); return (0); } </code></pre> <hr> Notice that, for brevity, the above code doesnt' perform any checks wether (file, memory,...) operations succeeded.
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1. POAdd additional xsd schemas with libXml2
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1. COI see this question dates from nov. 2012. If by any chance you (or someone else) found a better/other solution, care to share it here?
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