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> ## Further Information

> For further information on the Simple API for XML processing (SAX) standard, see:

> - The SAX standard page: `http://www.saxproject.org/`

> For more information on schema-based validation mechanisms, see:

> - The W3C standard validation mechanism, XML Schema: `http://www.w3c.org/XML/Schema`
> - RELAX NG's regular-expression based validation mechanism: `http://www.oasis-open.org/committees/relax-ng/`
> - Schematron's assertion-based validation mechanism: `http://www.ascc.net/xml/resource/schematron/schematron.html`

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