Article:		The .NET Schema Object Model
Subject:		Targeting a nested child element
Date:		2003-02-25 14:00:11
From:		Priyamvadha Lakshminarayanan
Response to: Targeting a nested child element
My mistake, the LocalElements property is not available in Version 1 of the .NET Framework. Try the following sample instead: foreach (XmlSchemaElement parentElement in schema.Elements.Values) { XmlSchemaComplexType ct = parentElement.ElementType as XmlSchemaComplexType; //Casting to complex type if (ct != null) { XmlSchemaSequence seq = (XmlSchemaSequence)ct.ContentTypeParticle; //Assuming it’s a sequence of elements foreach(XmlSchemaParticle p in seq.Items) { XmlSchemaElement elem = p as XmlSchemaElement; //Check if particle in seq is XmlSchemaElement if (elem != null) Console.WriteLine(elem.QualifiedName.ToString()); } } Thanks, Priya

Previous Message

Up

Next Message

• Targeting a nested child element
  2003-05-29 13:22:20 Carol Skelly [Reply]
  
  Hi..

  
  I also need to accomplish this in Vb.Net -- has anyone been successful with this?

  
  Also -- as you said the post-complilation Elements collection only contains top-level 'elements' -- so wouldn't we need to examine the Items collection instead to find any 'complextypes' or 'simpletypes'? ie:

  
  foreach (XmlSchemaElement parentElement in schema.Items) {

  
  Thanks for this great article! And please let me know if you can shed any light on the matter of traversing nested schema elements. Thanks!

  
  
  
  

  • Targeting a nested child element
    2004-11-15 06:36:28 Qoheleth [Reply]
    
    VB.NET version of the above code would be

    
    Dim parentElement As XmlSchemaElement
    For Each parentElement In schema.Elements.Values
    'Try Casting to complex type
    Dim ct As XmlSchemaComplexType
    Try
    ct = DirectCast(parentElement.ElementType, XmlSchemaComplexType)
    Catch ex As InvalidCastException
    ct = Nothing
    End Try
    If Not ct Is Nothing Then
    Dim seq As XmlSchemaSequence = DirectCast(ct.ContentTypeParticle, XmlSchemaSequence)

    
    'Assuming it’s a sequence of elements
    Dim p As XmlSchemaParticle
    For Each p In seq.Items
    'Check if particle in seq is XmlSchemaElement
    Dim elem As XmlSchemaElement
    Try
    elem = DirectCast(p, XmlSchemaElement)
    Catch ex As InvalidCastException
    elem = Nothing
    End Try

    
    If Not elem Is Nothing Then
    Console.WriteLine(elem.QualifiedName.ToString());
    End If
    Next
    End If
    Next

    
    
    
    
    

  • Targeting a nested child element
    2003-05-29 14:53:04 Priyamvadha Lakshminarayanan [Reply]
    
    To access nested elements, you would need to traverse down the content model of the parent element as shown in my previous post.

    
    The elements in the post-compilation Elements collection each have an ElementType property which exposes the compiled complex type or simple type of that element. To get to the child elements, you need to navigate down the complex type.

    
    The items collection is used to add items to the schema prior to compilation.