The following passage in section v.1 (http://www.tei-c.org/release/doc/tei-p5-doc/en/html/SG.html#SG11) has been inherited from the original intro to SGML:
> Three characteristics of XML distinguish it from other markup languages:
> 1. its emphasis on descriptive rather than procedural markup;
> 2. its notion of documents as instances of a document type;
> 3. its independence of any one hardware or software system.
I suspect the comparison is really no longer true, since at a minimum XML shares these features with other SGML-based languages. Perhaps the thing to do is remove the comparative aspect and just state these as strengths of XML, i.e. "XML has three main strengths:"