Schema validation with Xerces and JAXP 2003-01-08 - By Jesus M. Salvo Jr.
I am not sure though how to turn on Schema validation without using DTD
validation. So here are some questions:
1) If Schema validation is turned on, and the XML Schema source is
specified by an HTTP URL, is the parser supposed to fetch ( HTTP GET )
the schema from the specified URL?
2) [ Schema validation via JAXP ]
According to:
http://xml.apache.org/~edwingo/jaxp-ri-1.2.0-fcs/docs/samples.html#Schema
( referenced from: http://java.sun.com/xml/jaxp/faq.html#XMLSchema )
private static final String MM7_NS_URI =
"http://www.3gpp.org/ftp/Specs/archive/23_series/23.140/schema/REL-5-MM7-1-0";
private static final String JAXP_SCHEMA_LANGUAGE =
"http://java.sun.com/xml/jaxp/properties/schemaLanguage";
private static final String W3C_XML_SCHEMA =
"http://www.w3.org/2001/XMLSchema";
private static final String JAXP_SCHEMA_SOURCE =
"http://java.sun.com/xml/jaxp/properties/schemaSource";
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setNamespaceAware( true );
factory.setValidating( true );
factory.setAttribute( JAXP_SCHEMA_LANGUAGE, W3C_XML_SCHEMA );
factory.setAttribute( JAXP_SCHEMA_SOURCE, new URL( MM7_NS_URI ));
.. but when I did that, and answer to my question [1] is true, I cannot
see ( by running a sniffer on my local box ) any HTTP requests to the
specified URL of the schema(s) ... not even fetching the SOAP XML schema.
( no errors are returned by the parser )
Is:
DocumentBuilderFactory.setValidating( true ) equivalent to
DOMParser.setFeature( "http://xml.org/sax/features/validation", true ) ?
What is the equivalent of
DOMParser.setFeature(
"http://apache.org/xml/features/validation/schema", true ) and
DOMParser.setFeature(
"http://apache.org/xml/features/validation/schema-full-checking", true )
via JAXP?
3) However, if I directly do this ( not via JAXP but via Xerces 2.2
directly ):
DOMParser parser = new DOMParser();
parser.setFeature( "http://xml.org/sax/features/validation", true );
parser.setFeature( "http://apache.org/xml/features/validation/schema",
true );
parser.setFeature(
"http://apache.org/xml/features/validation/schema-full-checking", true );
... then I do get validation ... but it was reporting a DTD validation
error:
[Error] :2:178: cvc-elt.1: Cannot find the declaration of element
'SOAP-ENV:Envelope'.
... but I only want Schema validation
Any ideas?
--
Jesus M. Salvo Jr.
Mobile Internet Group Pty Ltd
(formerly Softgame International Pty Ltd)
M: +61 409 126699
T: +61 2 94604777
F: +61 2 94603677
PGP Public key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xC0BA5348
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