You are looking at the documentation for the 1.3 version of the Apache HTTP Server, which is no longer maintained, and has been declared "end of life". If you are in fact still using the 1.3 version, please consider upgrading. The current version of the server is 2.4.
Each Apache module is described using a common format that looks like this:
Each of the attributes, complete with values where possible, are described in this document.
This indicates how tightly bound into the Apache Web server the module is; in other words, you may need to recompile the server in order to gain access to the module and its functionality. Possible values for this attribute are:
This quite simply lists the name of the source file which
contains the code for the module. This is also the name used by
the <IfModule>
directive.
This is a string which identifies the module for use in the LoadModule directive when dynamically loading modules. In particular, it is the name of the external variable of type module in the source file.
If the module was not part of the original Apache version 1 distribution, the version in which it was introduced should be listed here.