Modifying the XML Schema Comparison Options
The XML Schema Comparison options can be changed in the XML Schema Comparison Options dialog box, which is called by clicking the Comparison Options 
icon in the Diff and Merge toolbar of an XML Schema Comparison window or via the Tools menu when the active comparison window is an XML Schema Comparison window.
You can also define whether or not DiffDog should start an automatic mapping when XML Schemas are loaded.
You define how DiffDog should transfer the changes in mapping of a global item to its children. Two options are available:
•Transfer global item mapping changes to children
This option transfers the mapping of global items if these items appear as children of other items but does not map the respective parent. In the screenshot below, the mapping of global item "Person" is transferred only when it appears as child of global item "Department", whereas the mapping of parent "Department" is not transferred.
•Map to according parent and transfer global item mapping changes to children
This option transfers the mapping of global items even if they do not appear as children. In the screenshot below, the mapping of both child "Person" and its parent "Department" is transferred.
To modify the XML Schema comparison options:
1.Do one of the following:
•Select the menu option Tools | Comparison Options....
•Click the Comparison Options icon in the Diff and Merge toolbar.
2.Change the settings in the XML Schema Comparison Options dialog box as required