Ok, for everyone who is interested, too, where the clud comes from: I have asked on the AOO mailinglist and have become the answer. http://mail-archives.apache.org/mod_mbox/openoffice-users/201309.mbox/raw/%3C522C7B3F.4010100%40t-online.de%3E
it is the "cloudCallout" from presetShapeDefinitions.xml from ECMA-376. It is part of the standard specification of OOXML.
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