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XML Schema for XLink 1.1

From: <Simon.Cox@csiro.au>
Date: Wed, 3 Dec 2008 00:14:30 +0900
To: <www-xml-linking-comments@w3.org>
CC: <portele@interactive-instruments.de>, <creed@opengeospatial.org>, <rsingh@opengeospatial.org>
Message-ID: <5D27281509882544A841804E4EBA914C021F196572@EXWA-MBX01.nexus.csiro.au>
Sorry if this is a late comment, but I've only just become aware of the issue.

The 2008-03-31 Working Draft for XLink 1.1 includes a (non-normative) XML Schema for Xlink.
This is a good thing, long overdue!
We note that it is based on the OASIS XBRL schema.

The Open Geospatial Consortium (OGC) has been using XLink as part of Geography Markup Language (GML) since 2001.
We also developed an XLink schema - see http://schemas.opengis.net/xlink/1.0.0/xlinks.xsd
This was always intended as a stop-gap, pending the availability of a (preferably normative ...) schema from W3C.
So we are very pleased to see this appear, and also hope that it will be posted as separate artefact in a repository.

There is one concern however: the OGC XLink schema includes the attribute groups proposed in the original XLink specification
(simpleLink, extendedLink, locatorLink, etc) and which are still shown as ATTLISTs in the DTD fragments in the draft spec.
XLinks are incorporated into GML through a reference to the simpleLink group - see http://schemas.opengis.net/gml/3.2.1/gmlBase.xsd.

We note that these attribute groups do not appear in the the proposed schema.

Would it be possible for these attribute groups to be added to the proposed schema?
This would allow OGC to transition to using the W3C schema without any changes.
AFAICT it would have no negative impacts on the proposed schema.

Simon Cox
(co-editor GML 2, GML 3)

Simon.Cox@csiro.au  CSIRO Exploration & Mining
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PO Box 1130, Bentley WA 6102  AUSTRALIA
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Received on Tuesday, 2 December 2008 15:17:15 UTC

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