XLIFF 2.0 Comments - attributes from xml namespace

In section 2.3.2, both xml:lang and xml:namespace are defined. They are also listed as optional attributes for <source> and <target>. Shouldn’t we also define xmlns in that section and list it as an optional attribute
 for <xliff> since this is the main mechanism for declaring a module’s namespace? For example:

 

<xliff xmlns:xlf="urn:oasis:names:tc:xliff:document:2.0" xmlns:val="urn:oasis:names:tc:xliff:validation:2.0" xmlns:ctr="urn:oasis:names:tc:xliff:changeTracking:2.0" xmlns:mda="urn:oasis:names:tc:xliff:metadata:2.0"
 xmlns:mtc="urn:oasis:names:tc:xliff:matches:2.0" xmlns:res="urn:oasis:names:tc:xliff:resourceData:2.0" version="2.0" srcLang="en-US" tgtLang="de-DE">

Thanks,

Ryan