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Trang, a multi-format schema converter based on RELAX NG.

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package com.thaiopensource.relaxng.input.parse;

import com.thaiopensource.datatype.DatatypeLibraryLoader;
import com.thaiopensource.relaxng.edit.SchemaCollection;
import com.thaiopensource.relaxng.edit.Pattern;
import com.thaiopensource.relaxng.edit.NameClass;
import com.thaiopensource.relaxng.edit.SourceLocation;
import com.thaiopensource.relaxng.input.InputFailedException;
import com.thaiopensource.relaxng.input.InputFormat;
import com.thaiopensource.relaxng.parse.IllegalSchemaException;
import com.thaiopensource.relaxng.parse.Parseable;
import com.thaiopensource.relaxng.translate.util.EncodingParam;
import com.thaiopensource.relaxng.translate.util.InvalidParamsException;
import com.thaiopensource.relaxng.translate.util.ParamProcessor;
import com.thaiopensource.resolver.Resolver;
import com.thaiopensource.resolver.xml.sax.SAXResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import java.io.IOException;

public abstract class ParseInputFormat implements InputFormat {
  private final boolean commentsNeedTrimming;
  protected ParseInputFormat(boolean commentsNeedTrimming) {
    this.commentsNeedTrimming = commentsNeedTrimming;
  }

  public SchemaCollection load(String uri, String[] params, String outputFormat, ErrorHandler eh, Resolver resolver)
          throws InputFailedException, InvalidParamsException, IOException, SAXException {
    final InputSource in = new InputSource(uri);
    ParamProcessor pp = new ParamProcessor();
    pp.declare("encoding",
               new EncodingParam() {
                 protected void setEncoding(String encoding) {
                   in.setEncoding(encoding);
                 }
               });
    pp.process(params, eh);
    Parseable parseable = makeParseable(in, new SAXResolver(resolver), eh);
    try {
      return SchemaBuilderImpl.parse(parseable,
                                     uri,
                                     eh,
                                     new DatatypeLibraryLoader(),
                                     commentsNeedTrimming);
    }
    catch (IllegalSchemaException e) {
      throw new InputFailedException();
    }
  }

  protected abstract Parseable makeParseable(InputSource in, SAXResolver resolver, ErrorHandler eh) throws SAXException;
}