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[bug 37746] string ids for content model and format.

Description

[bug 37746] string ids for content model and format.

The content model is stored as a varbinary(32), the format
as varbinary(64).

If the standard model resp. format is used, null is written
to the database instead of the actual id, saving space.

Change-Id: I32659b49a9ad3cb8ecae9019562cff7de42b65f9

Details