Validating Xml with an with the longer form of EndElement fails

[Labm1ce]

' First create Xml document

Dim oXmlDocument As New System.Xml.XmlDocument
oXmlDocument.LoadXml("<Trees><Oak TreeType=""deciduous""></Oak></Trees>")
oXmlDocument.Save("Trees.xml")

' .NET save xml document with spaces

<Trees>
<Oak TreeType=""deciduous"">
</Oak>
</Trees>

' Because there is spaces between <Oak ...and </Oakvalidation against an
xsd schema will now fail. Complains about white space.
' However, if the endelemnt </Oakwas removed and we closed the orginal Oak
like this:

<Trees>
<Oak TreeType=""deciduous""/>
</Trees>

' Validation succeeds. How can this be??

' validation code
Dim oXMLReader As Xml.XmlTextReader
Dim oXMLDoc As Xml.XmlDocument
Dim oXMLValidate As Xml.XmlValidatingReader
oXMLReader = New Xml.XmlTextReader("Trees.xml")
oXMLValidate = New Xml.XmlValidatingReader(oXMLReader)
oXMLValidate.ValidationType = Xml.ValidationType.Schema
dim oSchemaCollection As System.Xml.Schema.XmlSchemaCollection
oSchemaCollection = New System.Xml.Schema.XmlSchemaCollection
oSchemaCollection.Add(Nothing, "Trees.xsd") ' get .Net to autogenerate
oXMLValidate.Schemas.Add(oSchemaCollection)
oXMLDoc = New Xml.XmlDocument
oXMLDoc.Load(oXMLValidate)

[Martin Honnen]

Labm1ce wrote:

<Trees>
<Oak TreeType=""deciduous""/>
</Trees>

It depends obviously on the schema definition of the Oak element that
you have not shown. If that element has been defined to be empty then it
is not allowed to have any text content, not even white space content.
--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Labm1ce]

I think you missed the point of my question.

This doesn't work:
<Oak TreeType=""deciduous"">
</Oak>
This does work:
<Oak TreeType=""deciduous""></Oak>
This also works:
<Oak TreeType=""deciduous""/>

My question is why is the Validating schema giving me a WhiteSpace error and
the Xml that the .Save function created which by the way added the white
space. All three versions of the xml should be acceptable, but I can't
validate the first one.

Here's the xml schema file:
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="Trees">
<xs:complexType>
<xs:sequence>
<xs:element name="Oak">
<xs:complexType>
<xs:attribute name="TreeType" type="xs:string" use="required" />
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>

"Martin Honnen" wrote:

It depends obviously on the schema definition of the Oak element that
you have not shown. If that element has been defined to be empty then it
is not allowed to have any text content, not even white space content.

[Martin Honnen]

Labm1ce wrote:

I think you missed the point of my question.

No, I don't think so, there is a difference between an element that has
no content at all and one that has white space content when it comes to
schema validation.

My question is why is the Validating schema giving me a WhiteSpace error and
the Xml that the .Save function created which by the way added the white
space. All three versions of the xml should be acceptable, but I can't
validate the first one.

<xs:element name="Oak">
<xs:complexType>
<xs:attribute name="TreeType" type="xs:string" use="required" />
</xs:complexType>
</xs:element>

That way the element is defined to have no content at all, only that
attribute. So the validator is right to complain if there is white space
in the element. The main problem is in my view that the Save method
inserts that white space in the element, that should not happen and is a
bug in my view.

You might be able to avoid the problem of Save inserting white space by
setting
oXmlDocument.PreserveWhitespace = True
before you load that string with LoadXml.

Or you need to change the schema to e.g.

<xs:element name="Oak">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="TreeType" type="xs:string" use="required" />
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>

then

<Oak TreeType="whatever">
</Oak>

is allowed.


--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Labm1ce]

Doing this:
oXmlDocument.PreserveWhitespace = True

as suggested makes the XmlDocument not to do space tabbing. Which is
exactly what I need. :-)

Thanks