[dsdl-discuss] Full validation of Atom feeds containing extensions

Dear colleagues,

I wrote a note about full validation of Atom feeds containing extensions
such as OpenSearch and Google Calendar. Hisashi Miyashita, my
co-author, implemented an NVDL validator for such validation.

        Abstract

        The RELAX NG schema in RFC 4287 (The Atom Syndication Format)
        does not provide full validation of Atom feeds containing
        extensions. Rather, this schema skips extension elements and
        attributes, even when extension elements further contain Atom
        feeds or entries. This document shows that ISO/IEC 19757-4
        Namespace-based Validation Dispatching Language (NVDL for short)
        allows full validation of atom feeds containing extensions. NVDL
        decomposes atom feeds containing extensions into (1)
        extension-free atom and (2) extensions so that (1) and (2) are
        validated separately. As an example, an NVDL script for Google
        Calendar is presented. This NVDL script reveals validation
        errors of atom entries embedded in Google Calendar extension
        elements.

This note is available at:

http://www.asahi-net.or.jp/~eb2m-mrt/atomextensions/atomextensions.html

The validator is available at:

http://www.asahi-net.or.jp/~eb2m-mrt/nvdl/SnRNV-1.0.zip

Cheers,

-- 
MURATA Makoto <murata@hokkaido.email.ne.jp>
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