dbhtml_dir — Specifies a directory name in which to write files
<?dbhtml dir="path"?>
When chunking output, use the <?dbhtml dir?> PI
as a child of a chunk source to cause the output of that
chunk to be written to the specified directory; also, use it
as a child of a mediaobject to specify a
directory into which any long-description files for that
mediaobject will be written.