Hi Andy,
> I am setting up the xml schema namespace the same way eclipse does when
> you create a new XSD or XML file. I entered
> *http://www.w3.org/2001/XMLSchema-instance*in the address bar of my
> browsers and got quite a surprise!
>
The XML Namespace spec(1) states that the namespace URI need not be a
valid URL (i.e. point to a valid document on the network). In other
words, you are declaring your namespaces correctly.
> http://www.w3.org/TR/xmlschema-1/#no-xsi is very confusing.
If you look at section 3.2.7 (first table) at that location, you'll see
that using 'xsi:type' is perfectly fine.
> where does libxml get the schema lang schema/dtd? As a test I put some
> typos in my xsd file. libxml generated an error when I tried to validate
> the xsd file as expected?
You don't have to worry about libxml retrieving resources at namespace
locations, that does not happen. Only the actual URI string matters (as
per (1)).
> what URL should I be using?
>
> Do I need to make a special call to cause the libxml to use this other
> location?
Nope, you're using the right URIs, no network access is necessary.
> Would you be willing to send my your sample C program?
Sure thing (I should have done so in my original reply).
[] to compile:
$ gcc `xml2-config --cflags --libs` zoo.c -o zoo
[] sample run:
$ ./zoo zoo.xml ZooRequest.xsd
Attempting to validate zoo.xml with ZooRequest.xsd
Document in zoo.xml is valid
[] contents of zoo.xml:
$ cat zoo.xml
<?xml version="1.0" encoding="UTF-8"?>
<zoo:cageRequest xmlns:zoo="http://www.example.org/Zoo";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";>
<animal xsi:type="zoo:Fish">
<name>Blue Fin Tuna</name>
<numberOfFins>4</numberOfFins>
</animal>
</zoo:cageRequest>
Hope you get things sorted out.
Piotr
(1) - http://www.w3.org/TR/REC-xml-names/#ns-decl
/**
* Sample namespace XSD validation program.
* Released into public domain.
* Piotr Sipika
*/
#include <stdlib.h>
#include <stdio.h>
#include <libxml/xmlschemas.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
int
main(int argc, char * argv[])
{
if (argc != 3)
{
fprintf(stderr, "Need file name and schema file name\n");
return EXIT_FAILURE;
}
const char *pczFile = argv[1];
const char *pczSchema = argv[2];
xmlInitParser();
xmlDocPtr pDoc = xmlReadFile(pczFile, NULL, XML_PARSE_NONET);
if (!pDoc)
{
fprintf(stderr, "Unable to read %s\n", pczFile);
xmlCleanupParser();
return EXIT_FAILURE;
}
xmlDocPtr pSchemaDoc = xmlReadFile(pczSchema, NULL, XML_PARSE_NONET);
if (!pSchemaDoc)
{
fprintf(stderr, "Unable to read %s\n", pczSchema);
xmlFreeDoc(pDoc);
xmlCleanupParser();
return EXIT_FAILURE;
}
// create actual schema
xmlSchemaParserCtxtPtr pSchemaCtxt = xmlSchemaNewDocParserCtxt(pSchemaDoc);
if (!pSchemaCtxt)
{
fprintf(stderr, "Unable to create schema context\n");
xmlFreeDoc(pDoc);
xmlFreeDoc(pSchemaDoc);
xmlCleanupParser();
return EXIT_FAILURE;
}
xmlSchemaPtr pSchema = xmlSchemaParse(pSchemaCtxt);
if (!pSchema)
{
fprintf(stderr, "Unable to create schema\n");
xmlSchemaFreeParserCtxt(pSchemaCtxt);
xmlFreeDoc(pDoc);
xmlFreeDoc(pSchemaDoc);
xmlCleanupParser();
return EXIT_FAILURE;
}
xmlSchemaValidCtxtPtr pValidCtxt = xmlSchemaNewValidCtxt(pSchema);
if (!pValidCtxt)
{
fprintf(stderr, "Unable to create validity context for schema\n");
xmlSchemaFree(pSchema);
xmlSchemaFreeParserCtxt(pSchemaCtxt);
xmlFreeDoc(pDoc);
xmlFreeDoc(pSchemaDoc);
xmlCleanupParser();
return EXIT_FAILURE;
}
fprintf(stdout, "Attempting to validate %s with %s\n", pczFile, pczSchema);
xmlSchemaFreeParserCtxt(pSchemaCtxt);
xmlFreeDoc(pSchemaDoc);
int iError = xmlSchemaValidateDoc(pValidCtxt, pDoc);
if (iError == 0)
{
fprintf(stdout, "Document in %s is valid\n", pczFile);
}
else
{
fprintf(stdout, "Document in %s is NOT valid\n", pczFile);
}
xmlSchemaFree(pSchema);
// xmlSchemaFreeParserCtxt(pSchemaCtxt);
xmlFreeDoc(pDoc);
// xmlFreeDoc(pSchemaDoc);
xmlCleanupParser();
return EXIT_SUCCESS;
}
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