This is a web-based interface to the relational registry.

... TODO: developer docs ...

Adding new constraint types
---------------------------

To add a constraint,

(1) in main.html, add templates for the any new operator or operand
    you may require.  See operator-contains and operand-waveband
    as examples
(2) in static/wirr.js, add a _CONSTRAINTDEF. The key you use there is the
    constraint name, the values are the templates for the operand and
    the operator(s), respectively.
(3) in bin/dbadapter.py, add a _CONSTRAINTDEF with the constraint name as
    key.  The value is a function
    makeConstraint(constraint, sqlPars, addTables) -> sql-fragment.
    There is some documentation on what all that means.  In particular,
    there are some factory functions that may save you the work of
    defining a function of your own.
(4) back in main.html, locate the constraint-selector element (and ul/li
    hierarchy).  Find an appropriate place for your new constraint and
    put its name in there.  The human-readable label will be taken from
    the _CONSTRAINTDEF in wirr.js.


Adding a capability type
------------------------

(1) in res/main.html, locate operand-capabilities, and add an option
    giving the stanard id (pattern) of the new standard.

(2) in static/wirr.js, amend the STDID_TO_CAP_INFO dicts with a map
    from the standard id to a suitable array (see comment).

(3) if there's a SAMP message for that result type, amennd
    _MTYPES_FOR_CAPABILITIES in wirr.js, and provide a corresponding
    button.