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| XSD validating problem: default values |
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This message was discovered on microsoft.public.dotnet.xml.
| AL |
Hello,
I have a problem in validating xml docs that have been created via a
serialization class or dataset (generated with xsd.exe): when the xsd schema
contains a "default" value for an element or attribute: if the instance XML
doc does not express a value for such an element, validation fails.
The Schema looks like this:
<xs:schema targetNamespace="URN:testdoc"
xmlns:xs="http://www.w3.org/2001/XMLSchema"; xmlns:td="URN:testdoc"
elementFormDefault="qualified" attributeFormDefault="unqualified"
version="1.0">
<xs:element name="TestDoc">
<xs:complexType>
<xs:sequence>
<xs:element name="Paragrafo" type="xs:string"
default="ParText"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
Code for serialization:
Dim doc As TestDoc
doc = New TestDoc()
doc.Paragrafo = "ParText"
Dim ser As New Xml.Serialization.XmlSerializer(GetType(TestDoc),
"URN:testdoc")
Dim xw As New XmlTextWriter("c:\temp\testdoc.xml",
System.Text.Encoding.UTF8)
ser.Serialize(xw, doc)
the resulting xml does not express the "Paragrafo" element, if code fills in
a value equal to the default (seee above example), or if it does not fill a
value for that element:
<?xml version="1.0" encoding="utf-8"?>
<TestDoc xmlns:xsd="http://www.w3.org/2001/XMLSchema";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xmlns="URN:testdoc"/>
So, when I try to validate it, I get errors (missing element).Of course, if
I put a different value, all works pretty good.
So the question is: how can I validate such a doc? I believe I should use
XMLValidatingReader, but miss something: should I "repair", that is fill
missing values, the XML doc before validating it? And what's the correct way
to do this?
Any hint, sample code and doc reference will be greatly appreciated.
thank you,
AL.
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| SQL Server Development Team [MSFT] |
XmlDocument handle default attributes, but not default elements. A
workaround you could use is to catch the validation errors through register
your own ValidationEventHandler and skip such errors.
Hope this helps
Lanqing Dai
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