July 2004
Intermediate to advanced
479 pages
12h 30m
English
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Check the Integrity of a W3C Schema
Use the
xni.XMLGrammarBuilder class from Xerces to do some
extra checking on your schemas.
Whether you create a W3C XSD Schema
with the same tools you use to create other XML documents or use a
specialized schema-generation tool to create one, parsing it against
the schema in the Schema for Schemas appendix of the W3C Schema
recommendation (http://www.w3.org/TR/xmlschema-1/#normative-schemaSchema)
may alert you to some problems, such as whether you mistyped the name
of a schema definition element or put one schema definition element
inside of another where it doesn’t belong. There are
other potential errors that this won’t catch,
though; for example, what if your maxOccurs value
for one element is less than the minOccurs value
for the same element?
The xni.XMLGrammarBuilder class manages this
multidocument validation by creating a compiled version of that
schema in memory and then re-using that compiled version for each
instance document passed to it. Like any compiler, it makes various
integrity checks as it compiles. If you’re
developing an XSD schema, this round of checks can help you before
you’ve created your first document that conforms to
that schema.
Imagine that you just drafted a schema, badschema.xsd, which has the following problems:
In the content model for the
orderelement, theitemNumelement has amaxOccursvalue of1and aminOccursvalue of4. If the value must be greater than or equal to 4 or and less than or equal to 1, that ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.