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The following are some comments about the UPDF specification (Universal Printer Description Format, Version 0.83.1) document. I am new to UPDF, but perhaps this is a positive thing in that it will provide the perspective of someone coming to UPDF "cold" and only having what's written down in the spec to go by. *  There is no table of contents and no index, making it impossible to use this as a reference document. *   Heading levels are not numbered like they were in 0.81.3, making an already difficult-to-follow nesting structure (see the following point) now impossible-to-follow.  There are not even page numbers in the current version! *  It is very difficult to discern the nesting of the XML elements.  You have to either flip back and find the list of sub-elements in the containing element (in 0.81.3 you could count the numbering level in the numeric header, which gets very difficult as the nest level deepens).  I would suggest using heading numbers and indenting as well to make the nesting visually obvious. *  Many elements merely list the attributes without any explanation.  While the purpose of some can be deduced from the names, this is very imprecise in a standards document and opens it up for misunderstandings and incompatibilities between vendors. *  "XML-DTD encoding of UPDF" section references a DTD file but the UPDF is actually defined via XML schema (XSD) files. Regards, Alan Hlava IBM Printing Systems Division hlava@us.ibm.com