[basex-talk] Declarations for external variables not enforced

Howdy --

Using the REST interface, I'm currently able to do the following:

<rest:query xmlns:rest="http://basex.org/rest%22%3E rest:text$foo</rest:text> <rest:variable name="foo" value="bar"/> </rest:query>

...and get back "bar" as a result. Note the lack of a "declare variable $foo external" line.

I haven't read the spec to determine permissibility of this behavior, but it does come in handy at times (particularly, for permitting maximally terse one-liners). Is this something likely to go away in the future?

Thanks!