I work with HL7 files which have elements in excess of 300 for each
document. It is tedious to say the least to draw the lines for these since
most of them just map across to their counterpart in the destination
document.

We are working on a tool to automatically map elements that have the same
name, cardinality  and datatype. The tool is being written in C#.  We would
like to use the XPathDocument, XPathNavigator, and XPathNodeIterator classes
to hold and  process the documents.  We have run into problems when trying
to apply this expression, "*[//Schema]"  to the XML extract below. It
returns an empty node set:

<Schema name="ADT_A01" b:BizTalkServerEditorTool_Version="1.5"
b:root_reference="ADT-A01" b:standard="XML"
xmlns="urn:schemas-microsoft-com:xml-data"
xmlns:b="urn:schemas-microsoft-com:BizTalkServer"
xmlns:d="urn:schemas-microsoft-com:datatypes">
    <b:SelectionFields />
    <ElementType name="MSH_1_FieldSeparator" content="textOnly"
model="closed" b:type="string">
      <description>Field Separator</description>
    </ElementType>
</Schema>

If we remove the namespaces and their references the expression returns a
node set when applied to this XML extract but I am confused as to what is
returned. The Name property of the XPathNodeIterator current object is
"Schema" and the Value property of this object is "Field
Separator" which is the contents of the description node.

<Schema name="ADT_A01" BizTalkServerEditorTool_Version="1.5"
root_reference="ADT-A01" standard="XML">
    <SelectionFields />
   <ElementType name="MSH_1_FieldSeparator" content="textOnly"
model="closed" type="string">
      <description>Field Separator</description>
    </ElementType>
  </Schema>


We obviously do not understand what we are doing so if anyone has some code
samples that show how to manipulate the map I would appreciate it!

The code we are using is:
  private void ultraButtonLoadMap_Click(object sender, System.EventArgs e)
  {
   if( openFileDialogMap.ShowDialog(this) == DialogResult.OK )
   {
    _segments.Clear();
    ultraLabelLoadMapPath.Text = openFileDialogMap.FileName;
    try
    {
     XPathDocument messageDoc = new
XPathDocument(openFileDialogMap.FileName);
     XPathNavigator nav = messageDoc.CreateNavigator();
     XPathNodeIterator Iterator = nav.Select( textBoxXPath.Text );
     while (Iterator.MoveNext())
     {
      if( Iterator.Current.Value.Trim().Length == 3 )
       _segments.Add(Iterator.Current.Value.Trim());
     }
     int i = 0;
     i++;
    }
    catch( Exception ex )
    {
     MessageBox.Show( ex.Message);
    }
   }
  }



Thanks!

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