start parsing a grammar.
For an attribute to have a default value, it must be optional.
  11314:70@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  11320:76@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7440:66@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7448:65@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7456:69@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  10961:75@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  10977:76@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  10961:75@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  10977:76@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  10961:75@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  10977:76@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  4477:71@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7440:66@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7448:65@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7456:69@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7440:66@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7448:65@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7456:69@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7440:66@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7448:65@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  7456:69@file:///C:/work/odcp/26300/orig10.rng
For an attribute to have a default value, it must be optional.
  2539:78@file:///C:/work/odcp/26300/orig10.rng
There are more than one patterns that can match the "tracked-changes" element, and some of them have attribute default values and some of them dont. For the schema to be compatible, there must be a functional mapping from element and attribute names to default values.
  5966:43@file:///C:/work/odcp/26300/orig10.rng
  19467:18@file:///C:/work/odcp/26300/orig10.rng
The "ID" type of the "id" attribute has ID semantics but a competing attribute doesnt have the same type.
  19458:20@file:///C:/work/odcp/26300/orig10.rng
  19467:18@file:///C:/work/odcp/26300/orig10.rng
  10102:35@file:///C:/work/odcp/26300/orig10.rng
The "ID" type of the "id" attribute has ID semantics but a competing attribute doesnt have the same type.
  19458:20@file:///C:/work/odcp/26300/orig10.rng
  11344:22@file:///C:/work/odcp/26300/orig10.rng
  10102:35@file:///C:/work/odcp/26300/orig10.rng