[PLS1.0] i18n comment: Why orthography attribute?

Comment from the i18n review of:
http://www.w3.org/TR/2006/WD-pronunciation-lexicon-20060131/

Comment 27
At http://www.w3.org/International/reviews/0603-pls10/
Editorial/substantive: S
Owner: RI

Location in reviewed document:
4.5

Comment: 
What is the value of the orthography attribute?


We see no value, and its purpose is not expressed in the text.