From: Philippe Verdy (firstname.lastname@example.org)
Date: Fri Mar 26 2004 - 10:25:15 EST
From: "Antoine Leca" <Antoine10646@leca-marti.org>
> Avarangal asked about
> > the requirements by educational establishments is the ability
> > to print and display dependent vowels without dotted circles.
> John Cowan answered:
> > Avarangal scripsit:
> >> Can any one provide information on the sequences used for diplaying
> >> and printing dependent vowels as standalones.
> > The standards-conforming way to do so is to precede the dependent
> > vowel with a space character (U+0020).
> Does it fullfil the need (i.e., displaying _without_ dotted circles).
> If so, where is it written?
Space is a base character, then it combines with the next diacritic with which
it creates a "default grapheme cluster" which should be interpreted as if it was
a single character identity. It is NOT defective. Note that NBSP can be used as
well instead of SPACE, if you need that SPACE keeps its role of a keyword
To display the dotted circle, you can use a defective combining sequence
starting by the diacritic or vowel sign: for example use a control followed by
the isolated diacritic or vowel sign, or code the diacritic or vowel sign at the
beginning of a parsed plain-text element (in XML, HTML, XHTML or SGML, this is
normally delimited after character entities have been parsed and resolved). You
may also code explicitly the dotted circle symbol followed by the diacritic or
vowel sign to create a non defective combining sequence starting by that base
Now how would you interpret differently SPACE+diacritic or SPACE+vowel sign? If
you display a dotted circle there, then you'll display two separate glyphs for a
single grapheme cluster, and this is not intended by the normal Unicode
character model. It may be useful for debugging purpose or as a help tool to
compose text, but not to render an actual text out of an input context, and this
should require special code in the renderer to disable that feature in fonts or
Note that some fonts may incorrectly display SPACE+diacritic or SPACE+vowel sign
with a dotted circle after a space. This is not a issue with Unicode but with
the font or with the renderer.
This archive was generated by hypermail 2.1.5 : Fri Mar 26 2004 - 10:59:54 EST