Template:Indic letters/Tai Tham with matras/doc

Usage
is used to add the boilerplate for Tai Tham script consonant letters in articles such as Ka (Indic). It shows the vowel matras applied to the consonant and tells how the absence of a vowel is marked. While the system is simple for Pali, it is more complicated for each Tai language (Northern Thai, Tai Khün, Tai Lü and Lao), let alone all four together, and the description might need many revisions.

A typical usage would be as, for the letter High Ka.

Parameters

 * 1 or first unnamed parameter. The transliteration of the letter.  An IAST-style transliteration is used, so this might not be the same as the usual name of the letter.
 * 2 or second unnamed parameter. The letter itself in the Tai Tham script.
 * 3 or third unnamed parameter. The 'name' of the letter as used in the article.  It appears in the header of the table of matras.  It defaults to the letter plus 'a', but this is only completely suitable for resonants.  Optional
 * aa. The usual shape of the dependent vowel Ā used with the consonant when a writing system uses both round Ā (ᩣ) and tall Ā (ᩤ).  These may be regarded as presentation forms of one another, though following the precedent of Burmese, Unicode encodes them separately.  Optional and defaults to round, so tall is the only form that should appear in any invocations.
 * 1. The four consonants ᨢ, ᨤ, ᨪ and, glyphically at least, ᩌ do not occur in Lao. The presence of this parameter suppresses display of Lao-only matras.  The lo in the parameter name is the language code for Lao.
 * 1. The presence of this parameter suppresses the explanation of how further short vowels are composed and how the absence of a vowel is marked. It is intended for the second and subsequent invocation of this template on a page.  The vr stands for 'Vowel Reduction', covering both shortening and complete removal.