This procedure is defined in the server but not documented via ad_proc or proc_doc and may be intended as a private interface.
The procedure is defined as:
proc tdav::read_xml {} {
set xml [ns_getcontent -as_file false -binary false]
ns_log debug "\n-----tdav::read_xml XML = -----\n $xml \n ----- end ----- \n "
return $xml
}