Microsoft Typography | Developer information | Specifications | OpenType font development
Thai OpenType Specification | Terms | Shaping | Features | Other | Appendix


Terms

The following terms are useful for understanding the layout features and script rules discussed in this document.

Base Glyph - Any glyph that can have a diacritic mark above or below it. Layout operations are defined in terms of a base glyph, not a base character, as a ligature may act as the base.

Character - Each character represents a Unicode character code point. For example the 'ko kai' character is U+0E01.

Combining Mark - A vowel sign or tone mark which is positioned above or below a character to provide pronunciation guidance.

Cluster - the effective "unit" of Thai writing systems; consisting of a consonant, vowel signs, combining tone marks, and independent vowel letters.

Glyph - A glyph represents a form of one or more characters.



this page was last updated 25 February 2002
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Thai OpenType Specification | Terms | Shaping | Features | Other | Appendix
Microsoft Typography | Developer information | Specifications | OpenType font development