It is also proposed to add the following values allowed for mathvariant: Applying the HTML algorithm would set the first two items LTR, but then switch directions upon encountering the letter ; thus the last three items are reversed. The top-level html tag determines the directional context which can be changed on lower-level elements using the dir attribute.
This document has been produced by the members of the Math Interest Group. The overall mathematical directionality should be determined by a new dir attribute on the outermost math element which takes one of the values ltr or rtl ; the default is ltr.
Such stretching does occasionally appear, but is rare, in European mathematics. In the same way that European mathematics broadens the set of distinct symbols available by using bold face, Fraktur or other styles, so does Arabic mathematics but typically by varying strokes, adding tails or other extensions.
Implementors are encouraged to make it feasible for users to choose dotted or undotted mathematical symbol fonts easily in accord with local tastes. Moreover, since the mathematical material may commonly contain text and symbols coming from both Arabic and European languages, the question of how the Unicode bidirectional algorithm [UnicodeBiDi] should be applied arises.
Although letters in "tailed" and "stretched" forms are semantically distinct from the "initial" forms, they can be simulated by connecting with a particular final form of HEH and the final form of ALEF, respectively, and applying glyph shaping. The differences in names, number formatting and of course the language used for the connecting words are all due to localization.
We are aware of only one mathematical notation unique to Persian writing, the notation used for limits: There are two kinds of symbols: The terms Moroccan, Maghreb and Machrek will be used to indicate the general geographic areas where these styles are used, but there are no clearly defined borders between the regions.
The current MathML specification points out that the only combinations of characters and mathvariant that have an unambiguous interpretation are those that correspond to the SMP Math Alphanumeric Symbols. Some font families are designed to meet with the requirements of typesetting mathematical documents in an Arabic notation.ღWhere Tangents Meetღ Chapter 1+2
The Arabic notation for factorial is a sort of enclosure. In this Note, we have attempted to examine all notational conventions in current use with Arabic and languages written using Arabic script, without giving preference to one form over another. Indeed, it is considered an important point of Arabic calligraphy that they are not: Here, the most striking difference is that the overall mathematical layout is the mirror image of the preceding examples, that is, the mathematical directionality is RTL.
Both dotted and undotted alphabetic symbols are encountered in this Note. To the best of our knowledge, the unique notations described here cover all known differences. It is proposed to consider the mathvariant "normal", when applied to Arabic, to mean the result of glyph shaping, and in particular, the "isolated" style for single character tokens. This Note describes the notational issues encountered in presenting mathematics within Arabic and other RTL languages, in particular focusing on how these notations differ from the model described by MathML2.
As an example, consider the MathML fragment: This is a draft document and may be updated, replaced or obsoleted by other documents at any time.
Within any given "paragraph", directional runs are then ordered according to the overall directional context. All adjacent strongly-typed RTL characters such as a in a single Arabic word will be presented in right-to-left order, and vice versa for strongly-typed LTR characters.
In this Note, we simply encourage developers to implement this feature for the appropriate Arabic symbols. But even then, the desired ordering would need to be marked up as two separate mtext elements: