The Content Masking action defines a rule set to process XML data within the result set of a Microsoft SQL Server stored procedure call. Use the Content Masking action when you want to mask XML type data within the result set of a Microsoft SQL Server stored procedure call. The rule set that you specify in the Content Masking action contains a rule or rules that identify the XPath to the XML elements in the stored procedure result set that you want to mask.
For more information, see the chapter "Stored Procedure Result Set Masking."