Accessibiliy Features¶

• Inhaltsverzeichnis
• Accessibiliy Features
  • Activate Accessibility Features
  • Artifact tagging
  • Paragraph tagging
  • Alternative Texts
    • • Figures
      • Math
  • XMP Meta Data
    • • Author
      • Document Title
      • Publisher
      • Chapter authors/Contributors
      • Abstract
      • Keywords
      • Copyright
      • Other
  • Colours and Embedded Images
    • Output Intent and Embedded ICC Colour Profiles
    • Image files
    • Custom Text Colours

Activate Accessibility Features¶

Add a11y to the documentclass options:

\documentclass[…,a11y]{cocotex}

For PDF 2.0 use a11y20, instead.

Artifact tagging¶

Images and other contents that fulfill decorational purposes only must be tagged as artifacts to be ignored by reading software. This can be achieved as follows:

\ccaStructStart{Artifact}Linie\ccaStructEnd{Artifact}

• there exists also an environment that is not yet thoroughly tested:

\begin{ccaArtifact}…\end{ccaArtifact}

• consider tagging decorational images
• writing lines (if not tagged as forms)
• tbc

Paragraph tagging¶

Until further notice, text paragraphs need to be tagged by the converter by adding \ccaVstructStart{P} at the beginning of each paragraph (no whitespaces between the macro and subsequent text or other macros!) and \ccaVstructEnd{P} at the end of each paragraph (no whitespaces before \ccaVstructEnd!):

\ccaVstructStart{P}Ipsum Lorem … finis.\ccaVstructEnd{P}

This must also be done in broader contexts that may(!) contain multiple paragraphs of plain text, like footnotes, captions, list items, quotations, table cells or abstracts. Which ones exactly varies from publisher style to publisher style, so if in doubt, ask your friendly neighborhood TeX developer.

Alternative Texts¶

Figures and Math both need alternative texts.

Figures¶

For figures, there are two ways to encode alt-text: the alt Parameter in the optional argument of \includegraphics (needs texlive > 2021), e.g.

\incudegraphics[...,alt={This is what the image file shows}]{image.png}

or as \tpAltText inside the tpFigure or tpSubFloat environments:

\begin{tpFigure}
  \tpCaption{This is the caption}
  \tpAltText{This is the alt text. It MUST NOT be the same as the caption!}
  \tpFig{\includegraphics{image.png}}
\end{tpFigure}

If both exist, the alt in \includegraphics takes precedence over the \tpAltText.

Math¶

both inline and display style math needs alternative texts. This is done with the \ccaAddAltText macro:

\begin{equation*}\ccaAddAltText{Z equals x minus mu divided by sigma}%
  \mathbf{Z}=\,\frac{\boldsymbol{x}-\mathbf{\mu }}{\mathbf{\sigma }}
\end{equation*}

or, for inline math:

The Variable $x\addAltText{x}$ means...

XMP Meta Data¶

• Template.xmp

PDF/UA requires meta data to be embedded into the PDF file. CoCoTeX provides two ways to do that: If the TeX run does not find a xmp file that has the same basename as the .tex document, it generates one from the data in the tpMeta environment. If there is a .xmp file (either because it was there from the beginning, or it was generated during a previous tex run), it includes that one. If the xmp file is to be generated by the converter, make sure to use the attached template.xmp (see below) and include the document specific meta data in line 24 instead of the comment.

Important: Don't remove anything in that template, especially not the PIs at the beginning and end, and the blank spaces at the bottom of the template!

Also be cautious where to use rdf:Bag, rdf:Alt and rdf:Seq!

Use the following XML tags for meta data:

Author¶

is a list of the document's main authors or edtiors, one per line:

<dc:creator>
  <rdf:Seq>
    <rdf:li>Firstname Lastname</rdf:li>
    <rdf:li>Firstname Lastname</rdf:li>
    ...
  </rdf:Seq>
</dc:creator>

Document Title¶

There can be more than one document title for various languages. The displayed title (e.g. in the pdf viewer window's top line) depends on the selected system language

<dc:title>
  <rdf:Alt>
    <rdf:li xml:lang="x-default">Default title</rdf:li>
  </rdf:Alt>
</dc:title>

Publisher¶

<dc:publisher>
  <rdf:Bag>
    <rdf:li>Publisher Name</rdf:li>
  </rdf:Bag>
</dc:publisher>

Chapter authors/Contributors¶

<dc:contributor>
  <rdf:Bag>
    <rdf:li>Firstname Lastname</rdf:li>
    <rdf:li>Firstname Midname Lastname</rdf:li>
    ...
  </rdf:Bag>
</dc:contributor>

Abstract¶

Like dc:title, dc:description allows multiple entries for different languages.

<dc:description>
  <rdf:Alt>
    <rdf:li xml:lang="x-default">...</rdf:li>
  </rdf:Alt>
</dc:description>

Keywords¶

<dc:subject>
  <rdf:Bag>
    <rdf:li>keyword 1</rdf:li>
    <rdf:li>keyword 2</rdf:li>
    ....
  </rdf:Bag>
</dc:subject>

Copyright¶

<dc:rights>
  <rdf:Alt>
    <rdf:li xml:lang="x-default">Unless otherwise indicated, this work is licensed under a Creative Commons License Attribution 4.0 International. This does not apply to quoted content and works based on other permissions.</rdf:li>
  </rdf:Alt>
</dc:rights>

Other¶

If you must, you can alter the values of <pdf:Producer> and <xmp:CreatorTool>, where pdf:Producer is the tool that generated the PDF, and xmp:CreatorTool is the Tool with which the original manuscript was created prior to any conversions or transformations.

The values of xmp:ModifyDate and xmp:CreateDate are generated and overwritten during the tex run by the ltpdfa package, so you can leave those fields as they are.

Colours and Embedded Images¶

Output Intent and Embedded ICC Colour Profiles¶

By default, CoCoTeX puts CMYK as output intent, but this can be overridden with the color-env class option:

\documentclass[…,color-env=<space>,…]{cocotex}

The Value <space> should be one of the values in the left column of the following table:

<space>	icc profile
srgb, rgb	IEC 61966-2.1 Default RGB colour space - sRGB
cmy, cmyk	Coated FOGRA39
grey, gray	ISO Coated v2 - GREY 1c - (basICColor)
natural, none	(gray)

Publisher-wide colour profile can be set with the profile Property of the titlepage Container:

\ccAddToType{Properties}{titlepage}{%
    \ccSetProperty{output-intent}{%
      profile=<path to .icc file>;%
      components=<number of colour components>;%
      identifier=<name of colour profile>%
  }}

with the following values:

• <path to .icc file> is the path to the icc colour profile relative to the .tex file, including the file extension.
• <number of colour components> is the number of colour components, e.g., 3 for RGB, 4 for CMYK, etc.
• <name of colour profile> is the name of the colour profile (default values correspond to the right column in above's table)

A custom .icc profile valid only for the current document can be embedded with the following Components inside the tpMeta environment:

\begin{tpMeta}
  …
  \tpIccProfileFile{<path to .icc file>}
  \tpIccComponents{<number of colour components>}
  \tpIccIdentifier{<name of colour profile>}
  …
\end{tpMeta}

Image files¶

The colour spaces of embedded images must match the Output Indent of the PDF file for the latter to be PDF/A2-a compatible.

A quick-and-dirty conversion can be done with imagemagick:

magick <input>  -colorspace <color_space> -profile <path_to_icc> <output>

with

• <input> the path to the input image
• <color_space> the color space the image should be converted to (cmyk, rgb, etc)
• <path_to_icc> the path to the icc profile that gets embedded into the image
• <output> the name of the output image

Custom Text Colours¶

Custom document colours get automatically converted to the Output Intent color space by LaTeX, so they may be defined with any color model. The following colour definitions are roughly equivalent:

\definecolor{myblue}{HTML}{3527FF}
\definecolor{myblue}{RGB}{53,39,255}
\definecolor{myblue}{rgb}{0.21,0.15,1}
\definecolor{myblue}{cmyk}{0.79,0.85,0,0}