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The absence of datablock properties "will certainly be resolved soon as the need for them is becoming obvious" said the [[http://wiki.blender.org/index.php/Dev:Ref/Release_Notes/2.67/Python_Nodes|Python Nodes release notes]]. So this patch allows Python scripts to create ID Properties which reference datablocks. This functionality is implemented for `PointerProperty` and now such properties can be created with Python. In addition to the standard update callback, `PointerProperty` can have a `poll` callback (standard RNA) which is useful for search menus. For details see the test included in this patch. Original author: @artfunkel Alexander (Blend4Web Team) Reviewers: brecht, artfunkel, mont29, campbellbarton Reviewed By: mont29, campbellbarton Subscribers: jta, sergey, campbellbarton, wisaac, poseidon4o, mont29, homyachetser, Evgeny_Rodygin, AlexKowel, yurikovelenov, fjuhec, sharlybg, cardboard, duarteframos, blueprintrandom, a.romanov, BYOB, disnel, aditiapratama, bliblubli, dfelinto, lukastoenne Maniphest Tasks: T37754 Differential Revision: https://developer.blender.org/D113