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<!DOCTYPE html>
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<html lang="en-us">
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<head>
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<meta charset="utf-8">
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<title>Charis - Developer information</title>
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<meta name="author" content="SIL Writing Systems Technology">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<link rel="stylesheet" href="./assets/css/theme.css">
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<link rel="stylesheet" href="./assets/css/webfonts.css">
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</head>
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<body>
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<div class="container">
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<article class="article">
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<header>
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<h1 class="title">Charis - Developer information</h1>
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</header>
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<h2 id="welcome-font-developers">Welcome font developers!</h2>
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<p>We welcome other developers who wish to get involved in
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supporting and enhancing these fonts or who want to modify them.</p>
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<h2 id="permissions-granted-by-the-ofl">Permissions granted by the
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OFL</h2>
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<p>SIL’s fonts are licensed according to the terms of the <a
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href="https://openfontlicense.org">SIL Open Font License</a>. The
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OFL allows the fonts to be used, studied, modified and redistributed
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freely as long as they are not sold by themselves. For details see
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the OFL.txt and OFL-FAQ.txt files in the package.</p>
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<h2 id="building-the-fonts-from-source-code">Building the fonts from
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source code</h2>
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<p>The full source code for our Latin, Greek, and Cyrillic fonts is
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available on Github:</p>
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<ul>
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<li><a href="https://github.com/silnrsi/font-charis">Charis Github
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repository</a></li>
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<li><a href="https://github.com/silnrsi/font-doulos">Doulos SIL
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Github repository</a></li>
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<li><a href="https://github.com/silnrsi/font-gentium">Gentium Github
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repository</a></li>
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<li><a href="https://github.com/silnrsi/font-andika">Andika Github
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repository</a></li>
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</ul>
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<p>Font sources are in the <a
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href="https://unifiedfontobject.org/versions/ufo3/">UFO3</a> format
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with font family structures defined using <a
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href="https://github.com/fonttools/fonttools/tree/master/Doc/source/designspaceLib">designspace</a>.
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OpenType source code is stored in the <a
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href="https://adobe-type-tools.github.io/afdko/OpenTypeFeatureFileSpecification.html">.fea</a>
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format in the UFO (features.fea) but is maintained in a separate
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file using the more efficient and powerful <a
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href="hhttps://github.com/silnrsi/feax/blob/main/docs/feaextensions.html">.feax</a>
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format.</p>
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<p>The fonts are built using a completely free and open source
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workflow using industry-standard tools (<a
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href="https://github.com/fonttools/fonttools">fonttools</a>), a
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package of custom python scripts (<a
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href="https://github.com/silnrsi/pysilfont">pysilfont</a>), and a
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build and packaging system (<a
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href="https://github.com/silnrsi/smith">Smith</a>). The whole
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toolchain is available as a Docker container.</p>
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<p>Full instructions for setting up the tools and building SIL fonts
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are available on a dedicated web site: <a
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href="https://silnrsi.github.io/silfontdev/">SIL Font Development
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Notes</a>.</p>
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<h2 id="contributing-to-the-project">Contributing to the
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project</h2>
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<p>We warmly welcome contributions to the fonts, such as new glyphs,
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enhanced smart font code, or bug fixes. The <a
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href="https://silnrsi.github.io/silfontdev/en-US/Contributing_Changes.html">brief
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overview of contributing changes</a> is a good place to begin. The
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next step is to contact us by responding to an existing issue or
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creating an issue in the Github repository and expressing your
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interest. We can then work together to plan and integrate your
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contributions.</p>
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<p>Here are a few examples of contributions that would be welcomed
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(some more than others):</p>
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<ul>
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<li>Historic/Archaic Cyrillic</li>
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<li>Mathematical glyphs</li>
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<li>Additional scripts (Armenian, etc.), and any needed OpenType
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code</li>
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</ul>
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<p>Because we want to be able to guarantee a high level of quality
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for our fonts, we will review submissions carefully. Contributions
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will need to cover all the weights and styles of the family and in
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some cases all four font projects. Please don’t be discouraged if we
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do not include a submission due to quality or incompleteness, or if
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we ask you to make specific revisions.</p>
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<p>To enable us to accept contributions in a way that honors your
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contribution and respects your copyright while preserving long-term
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flexibility for open source licensing, you would also need to agree
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to the <strong>SIL Global Contributor License Agreement for Font
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Software (v1.1)</strong> prior to sending us your contribution. To
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read more about this requirement and find out how to submit the
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required form, please visit the <a
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href="https://software.sil.org/fontcla">CLA information
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page</a>.</p>
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<footer class="footer">
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<p>This guide is from the <a href="https://software.sil.org/charis/" title="" class="active">Charis project</a> version 7 and is copyright © 1997-2025 SIL Global.</p>
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</footer>
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</article>
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</div>
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</body>
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</html>
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