getOutputClass (line 65)

Allow SGL_Output with its template methods to be extended.

If you want to work with your own Seagull classes create your own namespace in the seagull/lib directory, ie, seagull/lib/FOO. To override the SGL_Output class you would then create seagull/lib/FOO/Output.php, extend it from SGL_Output and provide the classname "FOO_Output" in "site.customOutputClassName" so it can be loaded automatically.

class FOO_Output extends SGL_Output {}