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RELAX NG Converter

RELAX NG Converter is a tool to convert schemas written in various schema languages to their equivalent in RELAX NG.

It supports schemas written in XML DTD, RELAX Core, RELAX namespace, TREX, W3C XML Schema, and RELAX NG itself.

This release includes software developed by the Apache Software Foundation (https://www.apache.org/).

Usage

To convert a schema written in either RELAX Core, RELAX namespace, TREX, or W3C XML Schema, enter the following:

    java -jar rngconv.jar myschema.xsd > result.rng

The converter detects the schema language automatically (except for XML DTDs) and writes the result to "result.rng".

To convert an XML DTD, enter the following:

    java -jar rngconv.jar -dtd myschema.dtd > result.rng

Note that you need the -dtd option.

License

The most of the code is licensed under the BSD license (see license.txt). The only exception to this is a part of the code of XSDLib, which was taken from Apache, which is licensed under ASL 1.1 (see Apache-LICENSE-1.1.txt)

Known Limitations

  • This software relies on the Multi-Schema Validator (MSV). Therefore any limitations of MSV apply also to this converter. See [1] for more information.

  • RELAX Core permits undeclared attributes to appear in instance documents. This semantics is not converted. Therefore, any undeclared attributes are considered invalid after the conversion.

  • Identity constraints of W3C XML Schema are not converted. So if the source schema uses <xsd:key>,<xsd:keyref>, or <xsd:unique>, this converter ignores those declarations. The semantics of "ID", "IDREF", and "IDREFS" are converted properly.

  • It may fail to convert some datatype definitions, especially those that are derived in a very complex way with lots of facets.

  • Schemas that consist of multiple files are converted into one big RELAX NG grammar. This limitation can be used to parse modularized RELAX NG grammar and create a single monolithic grammar.

[1] Multi-Schema Validator (MSV) https://xmlark.github.io/msv/core/