Methods and apparatus to maintain validity of shared information

A method performed by an extensible markup language (XML) document management client, the method comprising:

• sending, to an XML document management server, a communication requesting an XML document,
• wherein the communication causes the XML document management server to generate a subset of the XML document for the principal such that validity of the subset is ensured by including all document parts required according to an XML schema despite the principal having access rights to only certain parts of the XML document but not other parts, and
• wherein the other parts are included in the subset without values.

A mobile communication device comprising:

• a processor executing an XML document management client configured to send, to an XML document management server, a communication requesting an XML document,
• wherein the communication causes the XML document management server to generate a subset of the XML document for the principal such that validity of the subset is ensured by including all document parts required according to an XML schema despite the principal having access rights to only certain parts of the XML document but not other parts, and
• wherein the other parts are included in the subset without values.