On tags, namespaces, paths

The full specification of a tag in fluidDB might be something like

http://fluidDB.fluidinfo.com/tags/njr/var/rating

The way we talk about this in FluidDB (at least, the bits we're agreed on) is as follows:

• rating is the name of the tag;
• njr/var is the name of a hierarchical namespace; njr is me and var is a (sub-)namespace that I've created under my username namespace njr/.

The problem, as usual, is that we may wish to refer to different bits of it. I am currently (for myself, and in my code) using the following names, though others will undoubtedly use others.

• http://fluidDB.fluidinfo.com/tags/njr/var/rating is the tag URI;
• /tags/njr/var/rating is the the full tag path;
• /njr/var/rating is the absolute tag path;
• /njr/var is the absolute namespace;
• var/rating is the relative tag path;
• rating is the short tag name;

Why do I care? Well, partly just so that we can talk about things, and partly because I want to make my functions be fairly liberal about what they accept (relative or absolute paths, filling in missing namespaces when appropraite) etc. I'm sure there'll be confusion for a while; hopefully followed by blissful clarity.