<documentation title="File names">
    <standard>
    <![CDATA[
    To be able to find which class is contained in a file, file names should be case-insensitively equal to class names. Some operating systems and tools are case-insensitive, though other are. So, file names should be in lower case to avoid any trouble.
    ]]>
    </standard>
    <code_comparison>
        <code title="Examples of valid file names">
        <![CDATA[
super_class.php
        ]]>
        </code>
        <code title="Examples of invalid file names">
        <![CDATA[
superclass.php // words not separated with underscores
SuperClass.php // not in lower case and words not separated with underscores
Super_class.php // not in lower case
        ]]>
        </code>
    </code_comparison>
</documentation>