PROPPATCH Method - Example
<XML>
<Namespace><Ref>DAV:</><AS>D</></>
<D:PropertyUpdate>
<Create><prop>
<propname>AIIM:Dublin:authors</>
<propvalue><XML:XML>
<Namespace><Ref>DAV:</><AS>D</></>
<Namespace><Ref>Z39.50:</><AS>Z</></>
<Z:Author>Jim Whitehead</>
<Z:Author>Roy Fielding</> </> </>
<Remove><propname>Z39.50:Copyright</></>