Combining characters/Extenders, etc. in Unicode

Paul W. Abrahams abrahams at
Mon Aug 9 19:13:41 BST 1999

The XML spec defines certain character classes (in Appendix B) that are
derived from the Unicode standard.   Could someone explain what is meant
by Ideographics, Combining Characters, and Extenders?  I'd like to get
this information without having to buy a whole book on Unicode, but so
far I haven't been able to find it.

Paul Abrahams
abrahams at

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