Fixed in following commit available in next branch of git repository.
Author: Peter A. Bigot <email@example.com>
Date: Wed Oct 9 14:16:03 2013 -0500
trac/219: append with mixed content creates unbound ElementContent
This occured only with wildcards, and was due to too lax filtering of
unrecognized values. Only material that has enough information identify
an element may be added as a wildcard. Other material may be accepted
as mixed content, if the type permits this.
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