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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] schema versioning and RDDL
Dear All,
I started to look at the applications of using namespace URI for schema
versioning [1], [2] and RDDL [3]; and was wondering if anybody can give
any thoughts (or had already given) to the pros and cons of this approach.
The idea is to use "#" separator for namespace versioning
(not "/" as proposed in the referenced resources), i.g:
<myObj xmlns="http://www.cogx.com/myObject#v1.0">
<myProp1 value="x">
</myObj>
<myObj xmlns="http://www.cogx.com/myObject#v1.2">
<myProp1 value="x">
<myProp2 href="http://www. cogx.com">
</myObj>
Than an RDDL document at the http://www.cogx.com/myObject location can
contain the following RDDL resource elements
with ids "v1.0" and "v1.2" correspondingly:
<xhtml xmlns="http://www.w3.org/1999/xhtml"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:rddl="http://www.rddl.org/">
<head>
<title>RDDL Resources for myObject </title>
</head>
<body>
<h1>RDDL Resources for myObject</h1>
<p>
Here we are describing myObject,
How it came about,
Its relationships to other objects,
its history, details,
and other related information
that can be useful for modelers and developers.
</p>
...
<rddl:resource
id="v1.0"
xlink:href="http://www.cogx.com/myobject/myobject20040401.xsd"
xlink:title="Version 1.0 of myObject schema, approved on April 1, 2004"
xlink:role="http://www.w3.org/2000/10/XMLSchema"
xlink:arcrole="http://www.rddl.org/purposes#schema-validation"
>
<rddl:resource
id="v1.2"
xlink:href="http://www.cogx.com/myobject/myobject20040421.xsd"
xlink:title="Version 1.2 of myObject schema, approved on April 21, 2004"
xlink:role="http://www.w3.org/2000/10/XMLSchema"
xlink:arcrole="http://www.rddl.org/purposes#schema-validation"
>
...
</body>
</xhtml>
This way information about all versions of myObject can be collocated in one
RDDL document.
Does it make sense?
--Nikita
[1] http://lists.xml.org/archives/xml-dev/200103/msg00995.html
[2] http://www-106.ibm.com/developerworks/xml/library/x-tipnamsp.html
[3] http://www.rddl.org
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