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Copyright C 2009, 2010 The CentOS Project. All rights
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reserved.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.2 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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<title>CentOS Artwork Repository: 3.23.4 Concepts</title>
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3.23.4 Concepts

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Inside <tt>`trunk/Translations'</tt> directory, we use "translation

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entries" to organize artworks "translation files" and their
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"translation templates".
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Translation Entries
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Translation entries exists for each artwork you want to produce.

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Translation entries can be empty directories, or directories
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containing translation files and translation templates.  
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When translation entries are empty directories, the identity entry is

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used as reference to create file names and directories layout for
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rendered files.  In this case, the centos-art script takes
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one design template and outputs one non-translated file for each
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design template available.  This configuration is mainly used to
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produce non-translatable artworks like themes' backgrounds.
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When translation entries contain translation files, the translation

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entry implements the CentOS release schema and is used as reference to
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create file names and directories layout for translated artworks. In
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this case, the centos-art script applies one translation
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file to one design template to create one translated instance which is
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used to output one translated file. When the translated file is
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rendered, the centos-art script remove the previous instance
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and takes the next file in the list of translation files to repate the
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whole process once again, and so on for all files in the list. This
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configuration is mainly used to produce translatable artworks like
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Anaconda's progress slide images.
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To find out correspondence between translation entries and identity

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entries, you need to look the path of both translation entries and
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identity entries. For example, if you are using the Modern's artisitic
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motif, the identity entry for Anaconda progress artwork is:
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trunk/Identity/Themes/Motifs/Modern/Distro/Anaconda/Progress
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and its translation entry is:

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trunk/Translations/Identity/Themes/Distro/Anaconda/Progress
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Note how the <tt>`Translations/'</tt> directory prefixes <tt>`Identity/'</tt>

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directory, also how static values (e.g., Identity, Themes, Distro,
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etc.) in the identity's entry path remain in translation's entry path,
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and how variable values like theme names (e.g., Modern) are stript out
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from translation's entry path. The same convenction can be applied to
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other identity entries in order to determine their translation
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entries, or to other translation entries to determine their identity
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entries.
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info

Note

Translation entries related to identity entries under

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<tt>`trunk/Identity/Themes/Motifs'</tt> do not use <tt>`Motifs/'</tt> in the
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path.  We've done this because <tt>`trunk/Identity/Themes/Models'</tt>
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structure, the other structure under <tt>`trunk/Identity/Themes'</tt>,
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doesn't require translation paths so far. So in the sake of saving
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characters space when building translation entries for
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<tt>`trunk/Identity/Themes/Motifs'</tt> structure, we organize Motifs
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translation entries under <tt>`trunk/Translations/Identity/Themes/'</tt>
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directly. 
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If for some reason <tt>`trunk/Identity/Themes/Models'</tt> structure

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requires translation entries, we need to re-oraganize the current
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directory structure accordingly.
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Translation entries, as described above, can be re-used by similar

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identity entries. For example the following identity entries:
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trunk/Identity/Themes/Motifs/Modern/Distro/Anaconda/Progress/
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trunk/Identity/Themes/Motifs/TreeFlower/Distro/Anaconda/Progress/
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trunk/Identity/Themes/Motifs/Mettle/Distro/Anaconda/Progress/
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are all valid identity entries able to re-use translation files inside

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Anaconda progress translation entry (the one shown in our example
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above). This way, you can create several identity entries and maintain
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just one translation entry for all of them.  Once you change the
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translation files inside the common translation entry, changes inside
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identity entries will take effect inside the next you render them.
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Trying to make things plain and simple: inside CentOS Artwork

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Repository, graphic designers can concentrate their efforts in
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artworks look and feel (the identity entries), and translators in
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artworks translations (the translation entries).
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Translation Markers
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Translation markers are used in "Theme Model Designs" and

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"Translation Files" as replacement patterns to commit content
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translation.  When you are rendering content using
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centos-art script inisde <tt>`trunk/Identity'</tt> structure,
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artistic motifs and translation files are applied to model designs to
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produce translated content as result. In order to have the appropriate
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translation in content rendered, markers defintion in translation
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files should match markers in model designs exactly. 
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Translation Markers

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Figure 3.1: The image rendering flow.

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Translation markers can be whatever text you want, but as convenction

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we use the following to represent releases of CentOS distribution:
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<samp>`=MINOR_RELEASE='</samp>
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Replace with minor release of CentOS distribution. In the schema M.N, the minor

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release is represented by the N letter.
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<samp>`=MAJOR_RELEASE='</samp>
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Replace with major release of CentOS distribution. In the schema M.N,

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the major release is represented by the M letter.
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<samp>`=RELEASE='</samp>
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Replace the full release of CentOS distribution. It is

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<samp>`=MAJOR_RELEASE=.=MINOR_RELEASE='</samp> basically. 
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Specific translation markers convenctions are described inside

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specific translation entries. Read translation entries documentation
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to know more about supported translation markers.
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Translation markers standardization creates a common point of

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reference for translators and graphic designers. To have a clean
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definition of translation markers makes possible that translators and
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graphic designers can work together but independently one another.
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Translation Templates
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Translation temlpates are organized inside translation entries, under

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<tt>`Tpl/'</tt> directory. There is just one <tt>`Tpl/'</tt> per translation
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entry. The translation template directory contains common translations
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files for different release-specific translation directories.  The
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translation template directory may be used as base to build
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non-reusable translations.
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Translation Files
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Translation files are text files with sed's commands inside,

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replacement commands mainly. As convenction, translation file names
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end in <samp>`.sed'</samp>. Translation files are used by centos-art
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script to produce translated artworks for specific major releases of
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CentOS Distribution. There are common translation files, specific
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translation, and template translation files.
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For example, the Firstboot artwork of CentOS distribution uses the

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images <tt>`splash-small.png'</tt> and <tt>`firstboot-left.png'</tt> as based
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to control its visual style. The <tt>`splash-small.png'</tt> image
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contains, in its graphic design, the release number information of
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CentOS distribution. So the <tt>`splash-small.png'</tt> is
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release-specific. In the other hand, the <tt>`firstboot-left.png'</tt>
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doesn't contain release number information. So the
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<tt>`firstboot-left.png'</tt> is not release-specific.
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If we want to produce Firstboot artwork for different major releases

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of CentOS distribution, using a monolithic visual identity, all
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Firstboot images should have the same visual style and, at the same
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time, the release-specific information in the release-specific images. 
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info

Note

The monolithic visual identity is implemented using

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theme models (see section trunk/Identity/Themes/Models) and artistic
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motifs (see section trunk/Identity/Themes/Motifs).
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Assuming that both theme models and theme motifs are ready for using,

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the initial translation entry to produce Firstboot artworks would look
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like the following:
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trunk/Translations/Identity/Themes/Distro/BootUp/Firstboot/
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|-- Tpl
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|   `-- splash-small.sed    <-- template translation file
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`-- firstboot-left.sed      <-- common translation file
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With this translation entry, the centos-art command is able

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to produce the image <tt>`firstboot-left.png'</tt> only. To produce
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<tt>`splash-small.png'</tt> images for major releases (e.g., 3, 4, 5, and
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6) of CentOS distribution we need to produce the release-specific
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translation files using the centos-art script as following:
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centos-art render --translation=/home/centos/artwork/trunk/Translations/Identity/Themes/BootUp/Firstboot --filter='3,4,5,6'
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The above command produces the following translation entiry:

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trunk/Translations/Identity/Themes/Distro/BootUp/Firstboot/
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|-- 3
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|   `-- splash-small.sed        <-- specific translation file
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|-- 4
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|   `-- splash-small.sed        <-- specific translation file
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|-- 5
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|   `-- splash-small.sed        <-- specific translation file
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|-- 6
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|   `-- splash-small.sed        <-- specific translation file
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|-- Tpl
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|   `-- splash-small.sed        <-- template translation file
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`-- firstboot-left.sed          <-- common translation file
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At this point centos-art is able to produce the Firstboot

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artwork images for major releases of CentOS distribution. To add new
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release-specific translation files, run the translation rendering
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command with the release number you want to produce translation files
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for in the <samp>`--filter='release-number''</samp> argument.
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Template Translation Files
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Template translation files are translation files stored inside

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translation template directory. Template translation files are used by
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centos-art script to produce specific translation files
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only. Template translation files may be empty or contain
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sed's replacement commands. If template translation files
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are empty files, the final specifc translation file built from it
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contains release-specific replacement commands only. For example, the
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Firstboot <tt>`splash-small.sed'</tt> template translation file looks like
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the following:
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# -------------------------------------
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# $Id: splash-small.sed 5316 2010-04-04 04:42:12Z al $
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# -------------------------------------
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In the above template translation file there are three comments lines,

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but when you render it, the centos-art adds the
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release-specific replacement commands. In our Firstboot example, after
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rendering Firstboot translation entry, the <tt>`splash-small.sed'</tt>
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translation file specific to CentOS 5, looks like the following:
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# Warning: Do not modify this file directly. This file is created
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# automatically using 'centos-art' command line interface.  Any change
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# you do in this file will be lost the next time you update
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# translation files using 'centos-art' command line interface. If you
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# want to improve the content of this translation file, improve its
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# template file instead and run the 'centos-art' command line
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# interface later to propagate your changes.
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# -------------------------------------
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# $Id: splash-small.sed 5316 2010-04-04 04:42:12Z al $
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# -------------------------------------
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# Release number information.
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s!=RELEASE=!=MAJOR_RELEASE=.=MINOR_RELEASE=!g
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s!=MINOR_RELEASE=!0!g
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s!=MAJOR_RELEASE=!5!g
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If template translation files are not empty, replacement commands

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inside template translation files are preserved inside
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release-specific translation files.  For example, consider the English
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template translation file of Anaconda progress welcome slide.  The
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translation template directory structure looks like the following:
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trunk/Translations/Identity/Themes/Distro/Anaconda/Progress/
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`-- Tpl
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    `-- en
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        `-- 01-welcome.sed
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and if we render translation files for CentOS 4 and CentOS 5 major

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releases, the translation entry would look like the following:
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trunk/Translations/Identity/Themes/Distro/Anaconda/Progress/
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|-- 4
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|   `-- en
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|       `-- 01-welcome.sed
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|-- 5
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|   `-- en
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|       `-- 01-welcome.sed
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`-- Tpl
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    `-- en
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        `-- 01-welcome.sed
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info

Note

Release-specific translation directories preserve

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template translation directory structure and file names.
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In the example above, the template translation file looks like the

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following:
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# ------------------------------------------------------------
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# $Id: 01-welcome.sed 4959 2010-03-18 02:27:24Z al $
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# ------------------------------------------------------------
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s/=TITLE=/Welcome to CentOS =MAJOR_RELEASE= !/
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s/=TEXT1=/Thank you for installing CentOS =MAJOR_RELEASE=./
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s/=TEXT2=/CentOS is an enterprise-class Linux Distribution derived from sources freely provided to the public by a prominent North American Enterprise Linux vendor./
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s/=TEXT3=/CentOS conforms fully with the upstream vendors redistribution policy and aims to be 100% binary compatible. CentOS mainly changes packages to remove upstream vendor branding and artwork./
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s/=TEXT4=//
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s/=TEXT5=//
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s/=TEXT6=//
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s!=URL=!http://www.centos.org/!
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and after render release-specific translation files, specific

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translation files look like the following:
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# Warning: Do not modify this file directly. This file is created
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# automatically using 'centos-art' command line interface.  Any change
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# you do in this file will be lost the next time you update
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# translation files using 'centos-art' command line interface. If you
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# want to improve the content of this translation file, improve its
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# template file instead and run the 'centos-art' command line
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# interface later to propagate your changes.
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# ------------------------------------------------------------
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# $Id: 01-welcome.sed 4959 2010-03-18 02:27:24Z al $
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# ------------------------------------------------------------
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s/=TITLE=/Welcome to CentOS =MAJOR_RELEASE= !/
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s/=TEXT1=/Thank you for installing CentOS =MAJOR_RELEASE=./
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s/=TEXT2=/CentOS is an enterprise-class Linux Distribution derived from sources freely provided to the public by a prominen t North American Enterprise Linux vendor./
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s/=TEXT3=/CentOS conforms fully with the upstream vendors redistribution policy and aims to be 100% binary compatible. Cent OS mainly changes packages to remove upstream vendor branding and artwork./
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s/=TEXT4=//
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s/=TEXT5=//
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s/=TEXT6=//
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s!=URL=!http://www.centos.org/!
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# Release number information.
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s!=RELEASE=!=MAJOR_RELEASE=.=MINOR_RELEASE=!g
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s!=MINOR_RELEASE=!0!g
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s!=MAJOR_RELEASE=!5!g
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In the example above, relevant lines begin with the <samp>`s'</samp> word

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followed by a separation character (e.g., <samp>`/'</samp>, <samp>`!'</samp>, etc.).
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These lines have the following format:
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s/REGEXP/REPLACEMENT/FLAGS
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The <samp>`/'</samp> characters may be uniformly replaced by any other single

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character within any given s command.  The <samp>`/'</samp>
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character (or whatever other character is used in its stead) can
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appear in the REGEXP or REPLACEMENT only if it is preceded by a
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<samp>`\'</samp> character.
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The s command is probably the most important in

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sed and has a lot of different options.  Its basic concept
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is simple: the s command attempts to match the pattern space
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against the supplied REGEXP; if the match is successful, then that
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portion of the pattern space which was matched is replaced with
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REPLACEMENT.
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Info

Tip

For more information about how to use sed's

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replacement commands and flags, read sed's documentation
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manual using the following command:
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info sed
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In the context of our translation files, the REGEXP space is where you

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define translation markers and REPLACEMENT space is where you define
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the translation text you want to have after artwork rendering.
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Sometimes we use the FLAG component with the <samp>`g'</samp> command to apply
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the replacements globally.
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Info

Tip

Use sed's <samp>`g'</samp> flag when one translation

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marker needs to be replaced many times in the same translation file.
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Inside translation files, you can use translation markers not only in

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the REGEXP space but in the REPLACEMENT space too. In order for this
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configuration to work, the REPLACEMENT of translation markers need to
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be define after its definition. For example, see in the
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release-specific translation file above how the
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<samp>`s!=MAJOR_RELASE=!5!g'</samp> replacement command is defined
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after <samp>`=MAJOR_RELASE='</samp> translation marker definition in
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the REPLACEMENT space of <samp>`=TITLE='</samp> translation marker replacement
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command.
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Common Translation Files
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Common translation files contain common localization or no

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localization at all for their related artworks.  They are in the root
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directory of the translation entry. Common translation files create
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common artworks for all major releases of CentOS Distribution.
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Specific Translation Files
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Specific translation files contain specific localization for their

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related artworks. Specific translation files are not in the root
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directory of the translation entry. Specific translation files are
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inside directories which describe the type of translation they are
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doing. 
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Translation Rendering
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When rendering translations, the centos-art script checks

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the translation entry to verify that it has a translation template
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directory inside. The translation template directory (<tt>`Tpl/'</tt>)
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contains common translation files used to build release-specific
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translation files. If the translation template directory doesn't exist
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inside the translation entry the translation rendering fails. In this
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case the centos-art script outputs a message and quits
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script execution.
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Translation (Pre-)Rendering Configuration Scripts
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When the centos-art script finds a translation template

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directory inside translation entry, it looks for translations
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pre-rendering configuration scripts for that translation entry.
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Translation pre-rendeirng configuration scripts let you extend
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translation's default functionality (described below). 
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Translation pre-rendering configuration scripts are stored in the

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<tt>`trunk/Scripts'</tt> directory structure, inside the appropriate
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language implementation. If you are using centos-art Bash's
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implementation, the translation pre-rendering scripts are store in the
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<tt>`trunk/Scripts/Bash/Config'</tt> location; if you are using
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centos-art Python's implementation, then translation
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pre-rendering scripts are stored in the
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<tt>`trunk/Scripts/Python/Config'</tt> location, and so on for other
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implementations.
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Bash's translation pre-rendering configuration scripts look like the

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following:
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#!/bin/bash
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#
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# loadConfiguration.sh -- brief description here.
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#
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# Copyright (C) YEAR YOURNAME
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# 
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# 
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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# USA.
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# 
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# ----------------------------------------------------------------------
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# $Id$
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# ----------------------------------------------------------------------
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function loadConfiguration {
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...
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}
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Translation pre-rendering scripts are function scripts loaded and

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executed when rendering a translation entry. Translation pre-rendering
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scripts are loaded using the translation entry being rendered as
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reference. For example, suppose you are using the
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centos-art Bash's implementation, and you are rendering
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translations for CentOS brands, in this situation the translation
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entry would be:
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trunk/Translations/Identity/Brands
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and the entry inside the translation pre-rendering configuration

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structure would be
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trunk/Scripts/Bash/Config/Identity/Brands
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Once the centos-art Bash's implementation detects that

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translation pre-rendering configuration directory exists, it looks for
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the <tt>`render.conf.sh'</tt> script file. If the <tt>`render.conf.sh'</tt>
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file exists, it is loaded and executed. Once the <tt>`render.conf.sh'</tt>
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file has been executed the translation rendering is over and the
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script execution ends.
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Translations Rendering Default Functionality
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In contrast, if there is no <tt>`render.conf.sh'</tt> file or it isn't

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written as a function script, the centos-art script ignores
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it and passes to apply default translation process instead.
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The default translation process takes place using translation

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templates available inside translation entry. It is simple. The
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centos-art script takes the template structure and
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duplicates it inside a release-specific translation structure using
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the <samp>`release-number'</samp> value, passed in the
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<samp>`--filter='release-number''</samp> argument, as reference. Inside
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release-specific translation files, release number replacements are
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added at the end of each file to provide release-specific translation
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to release-specific translation markers inside translation files.
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