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Mode=Remove says: - - - - - - When the Mode attribute is set to a value of "http://www.w3.org/2002/ws/ra/edcopies/ws-fra/Modes/Remove" the resource representation referenced by the children of the Expression element MUST be deleted from the resource representation. - - - - - - This doesn't say what to do if the data is already missing. We don't want people to consider this an error condition. Proposal: reword it like this: This Mode value indicates that the resource representation referenced by the children of the Expression element MUST be deleted from the resource representation. If the fragment is absent, or if the Expression evaluates to an empty fragment, then this operation MUST have no effect.
resolved with This Mode value indicates that the resource representation referenced by the children of the Expression element MUST be deleted from the resource representation. If the target fragment is not present then this operation MUST have no effect.