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    <p>Actually it is not difficult to patch libxml2 (this walkthrough was done on Ubuntu 11.04 with Python 2.7.3)</p> <p>First define a test program <code>wbr_test.py</code>:</p> <pre><code>from lxml import etree from cStringIO import StringIO wbr_html = """\ &lt;html&gt; &lt;head&gt; &lt;title&gt;wbr test&lt;/title&gt; &lt;/head&gt; &lt;body&gt; Test for a breakable&lt;wbr&gt;word implemenation change &lt;/body&gt; &lt;/html&gt; """ parser = etree.HTMLParser() tree = etree.parse(StringIO(wbr_html), parser) result = etree.tostring(tree.getroot(), pretty_print=True, method="html") if result.split() != wbr_html.split(): # split, as we are not interested in whitespace differences print(result) print("not ok") else: print("OK") </code></pre> <p>Make sure that it fails by running <code>python wbr_test.py</code>. It should insert a <code>&lt;\wbr&gt;</code> before <code>&lt;\body&gt;</code>, and print <code>not ok</code> at the end.</p> <p>Download, extract and compile <code>libxml2</code>:</p> <pre><code>wget ftp://xmlsoft.org/libxml2/libxml2-2.8.0.tar.gz tar xvf libxml2-2.8.0.tar.gz cd libxml2-2.8.0/ ./configure --prefix=/usr make -j8 # adjust number to match your number of cores </code></pre> <p>Install, and install python libxml2 bindings:</p> <pre><code>sudo make install cd to_python_bindings sudo python setup.py install </code></pre> <p>Test your <code>wbr_test.py</code> once more, to make sure it fails with the latest libxml2 version.</p> <p>First make a copy of <code>HTMLparser.c</code> e.g. in <code>/var/tmp</code>.</p> <p>Now edit the the file HTMLparser.c at the toplevel of the libxml2 source. Search for the word <code>forced</code> (only one occurrence). You will be at the <code>&lt;br&gt;</code> tag definition. Copy the three lines starting with the line you just found. The most appropriate insert point is just before the end (after the definition of <code>&lt;var&gt;</code>). To get the final comma right in the table insert the three lines before the one with just <code>'}'</code> not the one with <code>'};'</code>.</p> <p>In the newly inserted code Replace <code>br</code> with <code>wbr</code> and change <code>DECL clear_attrs</code> to <code>NULL</code> (assuming that a new tag does not have deprecated attributes).</p> <p>The result should diff with the version in <code>/var/tmp</code> ( <code>diff -u HTMLparser.c /var/tmp</code>) as follows:</p> <pre><code>@@ -1039,6 +1039,9 @@ }, { "var", 0, 0, 0, 0, 0, 0, 1, "instance of a variable or program argument", DECL html_inline, NULL, DECL html_attrs, NULL, NULL +}, +{ "wbr", 0, 2, 2, 1, 0, 0, 1, "possible line break ", + EMPTY , NULL , DECL core_attrs, NULL , NULL } }; </code></pre> <p>Make and install:</p> <pre><code>make &amp;&amp; sudo make install </code></pre> <p>Test your <code>wbr_test.py</code> once more. Should show <code>OK</code></p>
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    1. POlxml and <wbr> tags
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    1. COVery cool! Can you confirm there's no way to get similar results with just runtime configuration?
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    2. COA different way to phrase the same question: does libxml2 not allow runtime configuration of that list you've patched?
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    3. COI would really wonder if that would be possible with libxml2 without restructuring the source. The definitions are in a static const element table, which does *not* get copied into a more dynamic structure, but is used as is. Adding entries to such a table is not possible from C, hence not from Python.
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