I'm using an XmlValidatingReader to read an XML document and parse it against
my schema.  While I'm reading each node, I need to determine if the schema
allows an ID attribute for the node.  The ID is optional so it may not exist
in the XML document.  Is there a way to determine if the attribute is allowed
or not?  I can't seem to find any information on this anywhere.

Hi J

You use the classes in the System.Xml.Schema namespace to do this. Here's
some (inefficient!) code that shows how to read through a document, and test
whether the element can have an attribute called "id"...

HTH

Nigel Armstrong

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
        Dim t As New System.Xml.XmlTextReader("C:\testa.xml")
        Dim v As New System.Xml.XmlValidatingReader(t)
        v.ValidationType = Xml.ValidationType.Schema
        AddHandler v.ValidationEventHandler, AddressOf VEH
        Dim som As System.Xml.Schema.XmlSchema =
System.Xml.Schema.XmlSchema.Read(New IO.FileStream("C:\test.xsd",
IO.FileMode.Open), AddressOf VEH)
        som.Compile(AddressOf VEH)

        While v.Read
            If v.NodeType = Xml.XmlNodeType.Element Then
                Dim oc As System.Xml.Schema.XmlSchemaObjectCollection =
som.Items
                For Each o As Object In oc
                    If TypeOf o Is System.Xml.Schema.XmlSchemaElement Then
                        If o.Name = v.Name Then
                            Dim ct As System.Xml.Schema.XmlSchemaComplexType
= o.SchemaType
                            For Each a As
System.Xml.Schema.XmlSchemaAttribute In ct.Attributes
                                If a.Name = "id" Then
                                    MessageBox.Show(v.Name & " has an id
attribute")
                                End If
                            Next
                        End If
                    End If
                Next
            End If
        End While
        v.Close()
    End Sub

    Private Sub VEH(ByVal sender As Object, ByVal e As
System.Xml.Schema.ValidationEventArgs)
        Debug.WriteLine(e.Message)
    End Sub

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Let's try that again...

This is a little better - but it does rely on the fact that all the elements
in my particular schema are complex types...

HTH more!

Nigel Armstrong

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
        Dim t As New System.Xml.XmlTextReader("C:\testa.xml")
        Dim v As New System.Xml.XmlValidatingReader(t)
        v.ValidationType = Xml.ValidationType.Schema
        AddHandler v.ValidationEventHandler, AddressOf VEH

        While v.Read
            If v.NodeType = Xml.XmlNodeType.Element Then
                Dim ct As System.Xml.Schema.XmlSchemaComplexType =
CType(v.SchemaType, System.Xml.Schema.XmlSchemaComplexType)
                For Each a As System.Xml.Schema.XmlSchemaAttribute In
ct.Attributes
                    If a.Name = "id" Then
                        MessageBox.Show(v.Name & " has an id attribute")
                    End If
                Next
            End If
        End While
        v.Close()
    End Sub

    Private Sub VEH(ByVal sender As Object, ByVal e As
System.Xml.Schema.ValidationEventArgs)
        Debug.WriteLine(e.Message)
    End Sub

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