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February 19, 20260 citationsOpen Access

What is a character? UTF-8, Unicode, and the Xchar wordset

MEM. Anton Ertl

Key Points

  • The study aims to clarify the definition of a character in the context of Unicode and UTF-8 encoding.
  • Analyzed the concepts of code units and code points in UTF-8.
  • Discussed the implications of glyph representation in relation to Unicode standards.
  • Examined the usage of xchar words in programming contexts.
  • Identified that Unicode does not have a clear definition of 'character'.
  • Demonstrated that glyphs can be made of multiple code points.
  • Established that while xchar words exist, they are rarely used in practical applications.

Abstract

Unicode has the concepts of code unit (1 byte in UTF-8) and code point (1--4 bytes in UTF-8). It does not clearly define "character"; a glyph can consist of several code points. UTF-8 works great with Forth-94: Use strings to represent glyphs (or sequences of glyphs). Therefore the xchar words see little use, but they are there if you really want to deal with code points.

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Cite This Study

M. Anton Ertl (2025) studied this question.

synapsesocial.com/papers/6996a7b5ecb39a600b3ed997https://doi.org/10.34726/11824
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