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Subject:
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XSD composite key constraint
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Posted By:
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aldwinenriquez
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Post Date:
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8/15/2005 3:20:50 AM
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How do I implement composite key constraint for an xsd element I have. Basically I need to ensure that the two attributes (USERID and COURSEID) cannot be duplicated in the xml that I have.
How do I do that?
Aldwin Enriquez
"Dont you ever give up!"
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Reply By:
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aldwinenriquez
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Reply Date:
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8/15/2005 4:06:47 AM
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I got it guys..I used xs:key element..
<xs:key name="unq_USER_COURSE">
<xs:selector xpath="Courses"/>
<xs:field xpath="@USERID"/>
<xs:field xpath="@COURSEID"/>
</xs:key>
Aldwin Enriquez
"Dont you ever give up!"
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Reply By:
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mhkay
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Reply Date:
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8/15/2005 4:20:23 AM
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Use an xsd:unique element with more than one xsd:field child; the combination of all the xsd:field's defines the composite key.
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference
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