Define or modify Access Control information.
Sends Access Control information which is merged with the current access rights of the Library. Exact semantics depend on the actual Access Control implementation.
Note that in the case of the default ACL implementation:
Setting grant/deny rights on a Library member replaces the rights of this member (they are not merged with former values). For example, if the current rights on /users/joe are:
<member path='/users/joe'> <grant user="joe" permissions='Read'/> <grant user="jane" permissions='Read'/> </member>
then setting the following new rights would remove rights for user jane:
<accesscontrol> <member path='/users/joe'><grant user="joe" permissions='All'/></member> </accesscontrol>
It is possible to define access-rights on non-existing collections or documents.
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