Document Structure Description


Document Structure Description, or DSD, is a schema language for XML, that is, a language for describing valid XML documents. It's an alternative to DTD or the W3C XML Schema.
An example of DSD in its simplest form:
<dsd ="http://www.brics.dk/DSD/2.0"
="http://example.com">

<if><element =""/>
<declare>
<attribute =""/>
<attribute =""/>
<contents>
<element =""/>
</contents>
</declare>
</if>

<if><element =""/>
<declare>
<contents>
</contents>
</declare>
</if>

</dsd>
This says that element named "foo" in the XML namespace "http://example.com" may have two attributes, named "first" and "second". A "foo" element may not have any character data. It must contain one subelement, named "bar", also in the "http://example.com" namespace. A "bar" element is not allowed any attributes, character data or subelements.
One XML document that would be valid according to the above DSD would be:
<foo ="http://example.com" ="">
<bar/>
</foo>

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