The line property is read-only and returns the number of the line that contains the parse error.

In the following example the file 'staff.xml' is loaded which includes an error: the second employee element does not include an 'ssn' attribute which is required by the DTD. If a parse error occurs, as it does in this case, an alert displays the number of the line where it occurs.

Note:
Where no parse error occurs, the errorCode property returns 0.

XML:
<staff>
   <employee ssn="123456" pay="3">
      <name>John Sullivan</name>
      <position>senior executive</position>
   </employee>
   <employee>
      <name>Mary Lopez</name>
      <position>personal assistant</position>
   </employee>
</staff>

Code (VBScript):
Set objXMLDoc = CreateObject("Microsoft.XMLDOM")
objXMLDoc.async = False
objXMLDoc.load("staff.xml")
Set ParseErr = objXMLDoc.parseError
If ParseErr.errorCode <> 0 Then
   alert("Error Line: " & ParseErr.line)
End If

The alert displays the following message:

Output:
Error Line: 9