Tagged PDF - Math

Tagged PDF - Math

[Christoph Reller]

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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.

Christoph

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Re: Tagged PDF - Math

[Hans Hagen]

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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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
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