Thank you.   I am doing wc3 validation though a little differently than your 
sample.   
Below is some VB.Net code I used to test with.   "Try1" is using your method 
as close as I could translate it to VB.   "Try1" has the same results as your 
test.  "Try2" is how I was doing validation.  I start with a loaded 
XmlDocument (received via messaging) rather than from a file in the file 
system.   To get the XML into the XmlReader I first save it to a memory 
stream and then create the XmlReader with the content of the memory stream.   
"Try2" does not pick up the validation error on the foo element.   "Try3" is 
using my method but with the IgnoreWhitespace XMLReaderSetting set to true.  
"Try3" does pick up both validation errors.    Something about saving the 
XmlDocument to a memory stream and then creating the XmlReader from that 
stream must change the white space in the document.   

This seems to have changed at the time I installed the .Net Framework 
version 3.5 (Sp1).    I mistakenly believed the problem was caused by the bug 
identified in article 826753.   Knowing that wasn't the case helped a great 
deal!


    Sub main()
        Dim objXMLDoc As XmlDocument

        try1("c:\temp\xmlfile1.xml")

        objXMLDoc = New XmlDocument
        objXMLDoc.Load("c:\temp\xmlfile1.xml")
        try2(objXMLDoc)


        objXMLDoc = New XmlDocument
        objXMLDoc.Load("c:\temp\xmlfile1.xml")
        try3(objXMLDoc)

    End Sub

    Sub try1(ByVal astrFileName As String)
        'Validate an xml document.  Pull the document from the file system.

        System.Console.WriteLine("Try1")
        Dim objXMLReaderSettigns As XmlReaderSettings = New XmlReaderSettings
        objXMLReaderSettigns.ValidationType = ValidationType.Schema
        objXMLReaderSettigns.Schemas.Add(Nothing, "c:\temp\xmlschema1.xsd")
        AddHandler objXMLReaderSettigns.ValidationEventHandler, AddressOf 
ValidationCallBack

        Dim objXMLReader As XmlReader = XmlReader.Create(astrFileName, 
objXMLReaderSettigns)

        While objXMLReader.Read
        End While

    End Sub

    Sub try2(ByVal aobjXMLDoc As XmlDocument)
        'Validate an xml document.  XML Document is alread loaded into an 
XmlDocument object.

        System.Console.WriteLine("Try2")
        Dim objXMLReaderSettigns As XmlReaderSettings = New XmlReaderSettings
        objXMLReaderSettigns.ValidationType = ValidationType.Schema
        objXMLReaderSettigns.Schemas.Add(Nothing, "c:\temp\xmlschema1.xsd")
        AddHandler objXMLReaderSettigns.ValidationEventHandler, AddressOf 
ValidationCallBack

        Dim objMemoryStrm As System.IO.Stream = New System.IO.MemoryStream
        aobjXMLDoc.Save(objMemoryStrm)
        objMemoryStrm.Position = 0
        Dim objTextReader As XmlTextReader = New XmlTextReader(objMemoryStrm)

        Dim objXMLReader As XmlReader = XmlReader.Create(objTextReader, 
objXMLReaderSettigns)

        While objXMLReader.Read
        End While

    End Sub

    Sub try3(ByVal aobjXMLDoc As XmlDocument)
        'Validate an xml document.  XML Document is alread loaded into an 
XmlDocument object.

        System.Console.WriteLine("Try3")
        Dim objXMLReaderSettigns As XmlReaderSettings = New XmlReaderSettings
        objXMLReaderSettigns.ValidationType = ValidationType.Schema
        objXMLReaderSettigns.IgnoreWhitespace = True
        objXMLReaderSettigns.Schemas.Add(Nothing, "c:\temp\xmlschema1.xsd")
        AddHandler objXMLReaderSettigns.ValidationEventHandler, AddressOf 
ValidationCallBack

        Dim objMemoryStrm As System.IO.MemoryStream = New 
System.IO.MemoryStream
        aobjXMLDoc.Save(objMemoryStrm)
        objMemoryStrm.Position = 0
        Dim objTextReader As XmlTextReader = New XmlTextReader(objMemoryStrm)

        Dim objXMLReader As XmlReader = XmlReader.Create(objTextReader, 
objXMLReaderSettigns)

        While objXMLReader.Read
        End While

    End Sub

    Private Sub ValidationCallBack(ByVal sender As Object, ByVal args As _
        ValidationEventArgs)
        'Display the validation error.  This is only called on error
        System.Console.WriteLine("Validation error: " + args.Message)
    End Sub


The following are the results from all 3 tries:

Try1
Validation error: The 'foo' element is invalid - The value '' is invalid 
according to its datatype 'String' - The actual length is less than the 
MinLength value.
Validation error: The 'baz' attribute is invalid - The value '' is invalid 
according to its datatype 'String' - The actual length is less than the 
MinLength value.
Try2
Validation error: The 'baz' attribute is invalid - The value '' is invalid 
according to its datatype 'String' - The actual length is less than the 
MinLength value.
Try3
Validation error: The 'foo' element is invalid - The value '' is invalid 
according to its datatype 'String' - The actual length is less than the 
MinLength value.
Validation error: The 'baz' attribute is invalid - The value '' is invalid 
according to its datatype 'String' - The actual length is less than the 
MinLength value.



"Martin Honnen" wrote:

> TimB wrote:
> > Does anyone know when the issue identified in the following knowledge base 
> > article will be fixed with a service pack to the .Net Framework version 3.5?
> > 
> > http://support.microsoft.com/default.aspx/kb/826753
> > 
> > This issue prevents empty elements or attributes that have a minLength 
> > greater than zero from being identified as validation errors when validating 
> > an xml document using a schema.
> 
> That problem linked to above applies to
> 
> •	Microsoft XML Core Services 4.0
> •	Microsoft XML Core Services 4.0 Service Pack 1
> •	Microsoft XML Parser 3.0 Service Pack 3
> •	Microsoft XML Parser 3.0 Service Pack 2
> •	Microsoft XML Parser 3.0 Service Pack 1
> •	Microsoft XML Parser 3.0
> •	Microsoft XML Parser 2.6
> •	Microsoft XML Parser 2.5
> •	Microsoft XML Parser 2.0
> 
> and not to the .NET framework.
> 
> With the .NET framework and a W3C XML schema the problem does not exist:
> 
>              XmlReaderSettings xrs = new XmlReaderSettings();
>              xrs.ValidationType = ValidationType.Schema;
>              xrs.ValidationEventHandler += delegate(object sender, 
> ValidationEventArgs vargs)
>              {
>                  Console.WriteLine("{0}: {1}", vargs.Severity, 
> vargs.Message);
>              };
>              xrs.Schemas.Add(null, @"..\..\XMLSchema1.xsd");
> 
>              using (XmlReader rd = 
> XmlReader.Create(@"..\..\XMLFile1.xml", xrs))
>              {
>                  while (rd.Read()) { }
>              }
> 
> where the schema is as follows:
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
>    <xs:element name="root">
>      <xs:complexType>
>        <xs:sequence>
>          <xs:element name="foo">
>            <xs:simpleType>
>              <xs:restriction base="xs:string">
>                <xs:minLength value="2"/>
>              </xs:restriction>
>            </xs:simpleType>
>          </xs:element>
>          <xs:element name="bar">
>            <xs:complexType>
>              <xs:attribute name="baz" use="required">
>                <xs:simpleType>
>                  <xs:restriction base="xs:string">
>                    <xs:minLength value="2"/>
>                  </xs:restriction>
>                </xs:simpleType>
>              </xs:attribute>
>            </xs:complexType>
>          </xs:element>
>        </xs:sequence>
>      </xs:complexType>
>    </xs:element>
> </xs:schema>
> 
> and the instance is as follows:
> <?xml version="1.0" encoding="utf-8" ?>
> <root>
>    <foo></foo>
>    <bar baz=""/>
> </root>
> 
> 
> outputs the following two validation errors with Visual Studio 2005:
> 
> Error: The 'foo' element is invalid - The value '' is invalid according 
> to its datatype 'String' - The actual length is less than the MinLength 
> value.
> Error: The 'baz' attribute is invalid - The value '' is invalid 
> according to its datatype 'String' - The actual length is less than the 
> MinLength value.
> 
> 
> Or are you still using an XDR schema?
> 
> -- 
> 
> 	Martin Honnen --- MVP XML
> 	http://JavaScript.FAQTs.com/
>