"Linear representation", "linear string" and "professional form" need to be defined.
The string _0^1 is used as an example. (i) This needs to be explained. (ii) The syntax for it needs to be specified. (iii) Where can it be used (iv) Does that mean "_" and "^" are special characters in text so can’t be used as themselves If so, how can we use them without their special meaning (v) What other special characters are there
Revise the text to address this comment
7.1.2.23 [20-22]
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Proposed Disposition of DIS 29500 Comment GB-0535 (Modified: 2007-12-20) Agreed; the following changes will be made: 1. Part 4, §7.1.2.23, page 4,987, lines 2022: CtrlPr is also used to save properties on characters used in the " Linear representation " (Linear representation is equivalent to "built-down format" in the publicly available Unicode document UTN 28) of an equation, that are not displayed in the " Professional form " (Professional form is equivalent to "built-up format" in the publically available Unicode document UTN 28) . For example, the " linear string " (a string of characters in linear representation) _0^1 might have color on the _ or ^. Though these characters are not displayed in Professional form, their formatting is stored. Such characters can be used as themselves by preceding them with a backslash, for example, \^. In Office MathML, this property is represented by the <m:lit/> run property. A complete description of linear form/format, its use, its syntax, and its behaviour is fully documented in Unicode Technical Note #28. 2. Add to Part 1, §3, the following normative reference: Unicode Technical Note #28, http://unicode.org/notes/tn28/UTN28-PlainTextMath-v2.pdf
