Unescaped brackets in XHTML output

[namedgraph]

Hi,

I have Markdown that goes like this:

...the IRI *<http://www.example.com/my/2.0>* might be redirected to *<file:///usr/local/ontologies/imported.v20.owl>*.

which gets converted to the following XHTML:

...the IRI <em><a href="http://www.example.com/my/2.0">http://www.example.com/my/2.0</a></em> might be redirected to <em><file:///usr/local/ontologies/imported.v20.owl></em>.

Why is the http: link converted to <a> and file: is not?
In any case, raw brackets in <file:...> look like a bug to me -- they should be entity-escaped as <file:...>, otherwise the file is not well-formed XML.

[namedgraph]

Another example:

3. For every triple <s p o>, M(<s, p, o>)= <M(s), M(p), M(o)>;

becomes

<li>For every triple <s p o>, M(<s, p, o>)= <M(s), M(p), M(o)>;</li>

where it should be

<li>For every triple &lt;s p o&gt;, M(&lt;s, p, o&gt;)= &lt;M(s), M(p), M(o)&gt;;</li>

[namedgraph]

Python-Markdown/markdown#1321