I posted her as an XSLT adjacent question. I figured if anyone was
using ant with xslt it would be here.

Since posting, I continued to work on the problem. For the record, I
 dropped the use of the xslt task and switched to the Java task to
run my stylesheets. For whatever reason, I was having issues with
getting a catalog resolver to work with the  xslt task. The ant error
was a

Catalog resolution with Ant is hit-and-miss.  I've sometimes added
'resolver.jar' to the Saxon directory or the Ant 'lib' directory, and
sometimes recreated the catalog as an <xmlcatalog> in the Ant build file.

generic I/O message which I discovered was an issue about not finding
 the DTD. After switching to Java, I discovered that the xslt task
had an optimization feature, that if the stylesheet or content hadn't
changed, it skipped running. I never verified, but that added to the
flakiness I

I use XSLT to scan the real XSLT for <xsl:include> and <xsl:import> and
generate a temporary Ant build file with Ant <path> elements for the
dependencies of every XSLT file.  The real build file imports that file.

Tony Graham.
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Senior Architect
XML Division
Antenna House, Inc.
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Skerries, Ireland
tgraham@xxxxxxxxxxxxx