How about wrapping the parts you want to sign with a tag like this: 

<specialPart signature="FCC8DB26CBB972B478FB080736B33953">
   ...
</specialPart>

[download]

Update: It seems that jfroebe has already given you a pointer to this Introduction to XML Digital Signatures in which the topic of signing specific portions of a document is addressed.

 

In reply to Re: digitally sign XML Document by EdwardG
in thread digitally sign XML Document by piyush.shourie

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