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 dom::Element:Normalize {pVar nodes} { upvar $pVar parent set textNode {} foreach n $nodes { GetHandle node $n child set cleanup {} switch -- $child(node:nodeType) { textNode { if {[llength $textNode]} { # Coalesce into previous node append text(node:nodeValue) $child(node:nodeValue) # Remove this child upvar #0 $parent(node:childNodes) childNodes set idx [lsearch $childNodes $n] set childNodes [lreplace $childNodes $idx $idx] unset $n set cleanup {} PutHandle $textNode text } else { set textNode $n unset -nocomplain text array set text [array get child] } } element - document - documentFragment { set textNode {} Element:Normalize child [set $child(node:childNodes)] } default { set textNode {} } } eval $cleanup } return {} }