When pressing F3 on a function, we should take the user to the source declaration. However, for built-in functions, that's not so easy. Where do we take them? The SDOCML file? That's not very intuitive.
Suggest adding a URL parameter (could even be called a permalink, perhaps), that would be URL to fetch if we were called on to display information in this context. It could be a local URL or a remote one.
As a shortcut, a JSCA file or SDOCML file could also define some sort of regex that applied to the whole document...i.e. if the documentation files were constructed off some regular pattern from the function/method names, a single root-level element might describe how to construct a URL autoamtically.
The documentation should probably open up much as help does, in an editor window