[NTG-context] Tagged PDF - Math

Hans Hagen pragma at wxs.nl
Fri May 30 11:43:37 CEST 2014


On 5/30/2014 9:33 AM, Christoph Reller wrote:
> Hi,
>
> ConTeXt can produce tagged PDF - this is really cool! (At the moment
> ConTeXt/luaTeX seems to be the only macropackage/TeX-engine that is able to
> do this.)
>
> What is the status of producing structure information for math? After a
> quick evaluation I observe two issues:
>
> 1. Empty entry in RoleMap:
> ConTeXt wisely uses the RoleMap entry of the StructTreeRoot element in a
> PDF to map structure element names to standard element names. In PDF terms,
> RoleMap is a dictionary with keys and values. Unfortunately, certain math
> elements seem to lead to a corrupt RoleMap, e.g., the usage of a square
> root results in an empty dictionary key with corresponding value "\Span". A
> minimal example is:
>
> \setuptagging[state=start]
> \starttext
> \startformula
> \sqrt{A}
> \stopformula
> \stoptext
>
> 2. Structure element contains index of type "real number":
> According to the PDF Reference V 1.7 (see Table 10.10) a structure element
> dictionary's "K" entry can be an integer (e.g. "2") that denotes an index
> for a marked-content sequence. When tagging math, ConTeXt sometimes
> produces a real value (e.g. "2.000") instead. A minimal example is: (In
> this example the last element "B" receives such a "real number" index)
>
> \setuptagging[state=start]
> \starttext
> \startformula
> A = B
> \stopformula
> \stoptext
>
> I am using ConTeXt version 2014.05.27 13:38.
>
> Thanks in advance for any feedback.

fixed in next beta

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