Hi David,
It is coming from the formal.object.properties attribute-set, which is
"used" by the example.properties attribute-set in fo/param.xsl. It has
been that way since at least 1.68.1. You can set it to "auto" in
example.properties, or in formal.object.properties if you want to change it
for all formal object.
I think a lot of people are discovering it because they are upgrading to
FOP 0.93, which implements keeps for the first time.
Bob Stayton
Sagehill Enterprises
DocBook Consulting
bobs@sagehill.net