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12 <title>GLEP 34 -- Per-Category metadata.xml Files</title>
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25 [<b><a href="./glep-0034.txt">GLEP Source</a></b>]
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27 <table class="rfc2822 docutils field-list" frame="void" rules="none">
28 <col class="field-name" />
29 <col class="field-body" />
30 <tbody valign="top">
31 <tr class="field"><th class="field-name">GLEP:</th><td class="field-body">34</td>
32 </tr>
33 <tr class="field"><th class="field-name">Title:</th><td class="field-body">Per-Category metadata.xml Files</td>
34 </tr>
35 <tr class="field"><th class="field-name">Version:</th><td class="field-body">1.4</td>
36 </tr>
37 <tr class="field"><th class="field-name">Author:</th><td class="field-body">Ciaran McCreesh &lt;ciaranm&#32;&#97;t&#32;gentoo.org&gt;</td>
38 </tr>
39 <tr class="field"><th class="field-name">Last-Modified:</th><td class="field-body"><a class="reference" href="http://www.gentoo.org/cgi-bin/viewcvs/xml/htdocs/proj/en/glep/glep-0034.txt?cvsroot=gentoo">2005/05/02 20:30:24</a></td>
40 </tr>
41 <tr class="field"><th class="field-name">Status:</th><td class="field-body">Final</td>
42 </tr>
43 <tr class="field"><th class="field-name">Type:</th><td class="field-body">Standards Track</td>
44 </tr>
45 <tr class="field"><th class="field-name">Content-Type:</th><td class="field-body"><a class="reference" href="glep-0012.html">text/x-rst</a></td>
46 </tr>
47 <tr class="field"><th class="field-name">Created:</th><td class="field-body">11-March-2005</td>
48 </tr>
49 <tr class="field"><th class="field-name">Post-Date:</th><td class="field-body">11-March-2005, 13-March-2005, 2-May-2005</td>
50 </tr>
51 </tbody>
52 </table>
53 <hr />
54 <div class="contents topic" id="contents">
55 <p class="topic-title first"><a name="contents">Contents</a></p>
56 <ul class="simple">
57 <li><a class="reference" href="#abstract" id="id9" name="id9">Abstract</a></li>
58 <li><a class="reference" href="#motivation" id="id10" name="id10">Motivation</a></li>
59 <li><a class="reference" href="#specification" id="id11" name="id11">Specification</a><ul>
60 <li><a class="reference" href="#examples" id="id12" name="id12">Examples</a></li>
61 <li><a class="reference" href="#implementation-requirements" id="id13" name="id13">Implementation Requirements</a></li>
62 </ul>
63 </li>
64 <li><a class="reference" href="#backwards-compatibility" id="id14" name="id14">Backwards Compatibility</a></li>
65 <li><a class="reference" href="#references" id="id15" name="id15">References</a></li>
66 <li><a class="reference" href="#copyright" id="id16" name="id16">Copyright</a></li>
67 </ul>
68 </div>
69 <div class="section" id="abstract">
70 <h1><a class="toc-backref" href="#id9" name="abstract">Abstract</a></h1>
71 <p>A <tt class="docutils literal"><span class="pre">metadata.xml</span></tt> file <a class="footnote-reference" href="#id6" id="id1" name="id1">[1]</a> is currently used to provide extra metadata
72 (long descriptions, herd and maintainer information) about a package. It
73 is proposed that these files also be used to describe the purpose of a
74 category.</p>
75 </div>
76 <div class="section" id="motivation">
77 <h1><a class="toc-backref" href="#id10" name="motivation">Motivation</a></h1>
78 <p>Category names are short and not entirely clear. Adding arbitrary length
79 long descriptions to categories would provide several advantages:</p>
80 <ul class="simple">
81 <li>It would clarify the meaning of categories for users, who may not be
82 aware of some of the abbreviations or acronyms we use.</li>
83 <li>With the use of XML <tt class="docutils literal"><span class="pre">lang=&quot;&quot;</span></tt> attributes, it would allow for
84 additional non-English descriptions (simply using longer category names
85 would not allow this).</li>
86 <li>It would help developers better select a relevant category for their
87 package, rather than dumping everything into <tt class="docutils literal"><span class="pre">sys-apps</span></tt> and
88 <tt class="docutils literal"><span class="pre">app-misc</span></tt> as is done currently.</li>
89 <li>It would help illustrate which categories are too broad or badly defined
90 in scope, making any future category splits easier.</li>
91 </ul>
92 </div>
93 <div class="section" id="specification">
94 <h1><a class="toc-backref" href="#id11" name="specification">Specification</a></h1>
95 <p>It is proposed that the existing <tt class="docutils literal"><span class="pre">metadata.xml</span></tt> format <a class="footnote-reference" href="#id6" id="id2" name="id2">[1]</a> be used.
96 Even though XML sucks, there is already a framework in place for these
97 files. The filename will be <tt class="docutils literal"><span class="pre">blah-misc/metadata.xml</span></tt>. The character set
98 used shall be UTF-8 for consistency with GLEP 31 <a class="footnote-reference" href="#id7" id="id3" name="id3">[2]</a>.</p>
99 <p>A new top level <tt class="docutils literal"><span class="pre">&lt;catmetadata&gt;</span></tt> element shall be added to the DTD. This
100 is necessary because the existing <tt class="docutils literal"><span class="pre">&lt;pkgmetadata&gt;</span></tt> element is not
101 appropriately named, and doing a global rename would be impractical. Using
102 a different element would also permit additional category-specific data to
103 be added at a later date.</p>
104 <p>The existing <tt class="docutils literal"><span class="pre">&lt;longdescription&gt;</span></tt> elements shall be used for
105 descriptions. The <tt class="docutils literal"><span class="pre">lang</span></tt> attribute shall be used to indicate the human
106 language of the description -- all categories must have at least an
107 English (<tt class="docutils literal"><span class="pre">en</span></tt>) description.</p>
108 <p>The <tt class="docutils literal"><span class="pre">&lt;herd&gt;</span></tt> and <tt class="docutils literal"><span class="pre">&lt;maintainer&gt;</span></tt> elements are not generally relevant at
109 the category level. They may be specified as a fall-back &quot;assume that
110 everything in this category is maintained by these people&quot;, but this must
111 not be used as a replacement for proper per-package metadata.</p>
112 <div class="section" id="examples">
113 <h2><a class="toc-backref" href="#id12" name="examples">Examples</a></h2>
114 <p>The <tt class="docutils literal"><span class="pre">app-vim</span></tt> category could use a <tt class="docutils literal"><span class="pre">metadata.xml</span></tt> file like the
115 following:</p>
116 <pre class="literal-block">
117 &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
118 &lt;!DOCTYPE catmetadata SYSTEM &quot;http://www.gentoo.org/dtd/metadata.dtd&quot;&gt;
119 &lt;catmetadata&gt;
120 &lt;longdescription lang=&quot;en&quot;&gt;
121 The app-vim category contains plugins and syntax file
122 packages for the Vim text editor.
123 &lt;/longdescription&gt;
124 &lt;longdescription lang=&quot;de&quot;&gt;
125 Die Kategorie app-vim enthält Plugins und Syntax-Pakete
126 für den Vim Texteditor.
127 &lt;/longdescription&gt;
128 &lt;/catmetadata&gt;
129 </pre>
130 </div>
131 <div class="section" id="implementation-requirements">
132 <h2><a class="toc-backref" href="#id13" name="implementation-requirements">Implementation Requirements</a></h2>
133 <p>The DTD file would need to be updated to include the <tt class="docutils literal"><span class="pre">&lt;catmetadata&gt;</span></tt>
134 element.</p>
135 <p>A metadata file would have to be added to every category in the tree. This
136 could be done over a period of time.</p>
137 <p><tt class="docutils literal"><span class="pre">repoman</span></tt> would need a few small changes to be able to handle
138 per-category metadata files.</p>
139 <p>The &quot;packages.gentoo.org metadata&quot; bug <a class="footnote-reference" href="#id8" id="id4" name="id4">[3]</a> would need to be
140 updated to ask for category descriptions as well.</p>
141 <p>The metadata documentation <a class="footnote-reference" href="#id6" id="id5" name="id5">[1]</a> would require some additions.</p>
142 </div>
143 </div>
144 <div class="section" id="backwards-compatibility">
145 <h1><a class="toc-backref" href="#id14" name="backwards-compatibility">Backwards Compatibility</a></h1>
146 <p>The metadata DTD will remain backwards compatible.</p>
147 <p>The category metadata files will need to be considered &quot;optional until
148 implemented&quot; rather than immediately becoming mandatory.</p>
149 </div>
150 <div class="section" id="references">
151 <h1><a class="toc-backref" href="#id15" name="references">References</a></h1>
152 <table class="docutils footnote" frame="void" id="id6" rules="none">
153 <colgroup><col class="label" /><col /></colgroup>
154 <tbody valign="top">
155 <tr><td class="label"><a name="id6">[1]</a></td><td><em>(<a class="fn-backref" href="#id1">1</a>, <a class="fn-backref" href="#id2">2</a>, <a class="fn-backref" href="#id5">3</a>)</em> Gentoo Metadata,
156 (<a class="reference" href="http://www.gentoo.org/proj/en/devrel/handbook/handbook.xml?part=2&amp;chap=4">http://www.gentoo.org/proj/en/devrel/handbook/handbook.xml?part=2&amp;chap=4</a>)</td></tr>
157 </tbody>
158 </table>
159 <table class="docutils footnote" frame="void" id="id7" rules="none">
160 <colgroup><col class="label" /><col /></colgroup>
161 <tbody valign="top">
162 <tr><td class="label"><a class="fn-backref" href="#id3" name="id7">[2]</a></td><td>GLEP 31: Character Sets for Portage Tree Items
163 (<a class="reference" href="http://www.gentoo.org/proj/en/glep/glep-0031.html">http://www.gentoo.org/proj/en/glep/glep-0031.html</a>)</td></tr>
164 </tbody>
165 </table>
166 <table class="docutils footnote" frame="void" id="id8" rules="none">
167 <colgroup><col class="label" /><col /></colgroup>
168 <tbody valign="top">
169 <tr><td class="label"><a class="fn-backref" href="#id4" name="id8">[3]</a></td><td>Gentoo bug 66917
170 (<a class="reference" href="http://bugs.gentoo.org/show_bug.cgi?id=66917">http://bugs.gentoo.org/show_bug.cgi?id=66917</a>)</td></tr>
171 </tbody>
172 </table>
173 </div>
174 <div class="section" id="copyright">
175 <h1><a class="toc-backref" href="#id16" name="copyright">Copyright</a></h1>
176 <p>This document has been placed in the public domain.</p>
177 <!-- vim: set tw=74 fileencoding=utf-8 : -->
178 </div>
179
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