Score search by specific patterns

Hi, this is my first post here, motivated by the idea of tossing some ideas around rather than experimenting more in a vacuum.

This exploration has 2 dependencies. Firstly, what elements within a score file are searched when a text string is entered in the musescore.org score search dialog, and whether this can be expanded by any means if limited to text fields, such as title/composer etc. Secondly, can raw xml code be accessed and then searched using any technique? I imagine this could be quite procesor intensive if all the scores are stored compressed with only the text elements as searchable "tags". What exactly IS searched?

My initial motivation for this was to search for scores containing specific time-signatures, which didn't yield any useful results by entering the time signature in the search dialog. Then I though about this for a while, and thought... wow... how far down the pipe is the melody search engine, where a string of note values could be entered and matching scores returned? Using the internet-based versions of this kind of melody search reveals many limitations and surprises, but I would guess that searching a more uniform database of scores as represented by musescore could be a lot "sharper" tool.

Any interest here among you folks?