XML Security introduction
- Ensure authenticity, integrity and confidentiality of
    parts of XML documents
    
- Operating on a "bucket of bits" is easy
 - Operating on parts of XML documents requires identification and
        processing in:
        
- abstract (data model) manner
 - consistently serialized (octets) manner
 
 
 - Specific XML issues:
    
- selecting subsets of a document
 - canonicalizing subsets
 
 
