Fixed at rev 13243.
expanded recommendations on values of @xml:id
Expanded section to list example of xml:id usag...
Allow a text-wrapper element (e.g. ab) in notatedMusic
Provide place to record the Unicode Normalization Form used
Link to Unicode spec: http://unicode.org/reports/tr15/#Quick_Check_Table
Updated P5 to new alpha version
Tagging the 2.8.0 release of P5.