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Jing is a validator for RELAX NG and other schema languages. This project was taken from http://code.google.com/p/jing-trang and mavenized for inclusion in the Wicket Stuff HTML Validator. The code was taken from the 20091111 release.

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package com.thaiopensource.relaxng.jaxp;

import com.thaiopensource.relaxng.parse.Parseable;
import com.thaiopensource.relaxng.parse.compact.CompactParseable;
import com.thaiopensource.relaxng.pattern.Pattern;
import com.thaiopensource.relaxng.pattern.NameClass;
import com.thaiopensource.relaxng.pattern.CommentListImpl;
import com.thaiopensource.relaxng.pattern.AnnotationsImpl;
import com.thaiopensource.resolver.xml.sax.SAX;
import com.thaiopensource.resolver.xml.sax.SAXResolver;
import com.thaiopensource.validation.Constants;
import com.thaiopensource.util.VoidValue;
import org.xml.sax.ErrorHandler;
import org.xml.sax.Locator;

import javax.xml.transform.sax.SAXSource;

/**
 * A SchemaFactory that supports RELAX NG Compact Syntax.
 */
public class CompactSyntaxSchemaFactory extends SchemaFactoryImpl {
  /**
   * The String that is used to identify the schema language, when the schema language is RELAX NG Compact Syntax.
   * Usually XML schema languages use an XML syntax, and the schema language can be identified by the namespace URI,
   * but this is not the case with RELAX NG Compact Syntax.  RELAX NG Compact syntax has a registered MIME type,
   * which is application/relax-ng-compact-syntax, so we use the URI corresponding to that.
   * @see javax.xml.validation.SchemaFactory#isSchemaLanguageSupported
   * @see javax.xml.validation.SchemaFactory#newInstance(String)
   */
  static final public String SCHEMA_LANGUAGE = Constants.RELAXNG_COMPACT_URI;

  public boolean isSchemaLanguageSupported(String schemaLanguage) {
    return schemaLanguage.equals(SCHEMA_LANGUAGE);
  }

  protected Parseable createParseable(SAXSource source, SAXResolver saxResolver, ErrorHandler eh) {
    return new CompactParseable(SAX.createInput(source.getInputSource()), saxResolver.getResolver(), eh);
  }
}