Note: '<!--' and '-->' mark the beginning and end of comments and
the '<' and '>' mark the beginning and end of 'elements' which
provide the structuring. I will make liberal use of comments below
each line to explain what is meant above.
NOTE: THIS EXAMPLE IS TO PRESENT IDEAS FOR DISCUSSION. DO NOT TAKE
THIS AS A PROPOSAL.
POST /printer/killtree HTTP/1.1
Content-Type = text/xml
Content-Length = ???
<?XML version="1.0" encoding='UTF-8'>
<!-- XML version charset for operation -->
<?namespace href = "http://www.pwg.org/pub/pwg/ipp/" As = "P"?>
<?namespace href = "http://printing.eng.sun.com/jobSheets/" As = "S"?>
<!-- defines 'P' and 'S' as abbreviation for URLs so that -->
<!-- element names can be unique within name spaces -->
<!-- an element name of the form P:foo means that foo is defined -->
<!-- by the pwg url -->
<P:operation version = "1.1" name = "printJob" xml:lang="en">
<!-- ipp version operation name language -->
<P:operation-attributes>
<!-- operation attributes -->
<P:job-name xml:lang="de">mein Stoff</P:job-name>
<!-- note job-name's language is overridden easily -->
<P:requesting-user-name>Wolfgang</P:requesting-user-name>
</P:operation-attributes>
<!-- end of operation attributes -->
<P:job-attributes>
<P:job-priority>50</P:job-priority>
<P:sides ><P:side-type value=two-sided-long-edge/></P:sides>
<!-- the value is a key-word. Keywords can be done several ways -->
<P:job-sheets><P: job-sheet-type S:custom-job-sheet\></P:job-sheets>
<!-- the value is a key-word local to Sun -->
<P:resolution>
<!-- below is a sample structured value -->
<P:cross-feed>300</P:cross-feed>
<P:feed>300</P:feed>
<P:units>inch</P:units>
</P:resolution>
</P:job-attributes>
</P:operation>
<!-- document data is a problem -->