multi-surface language: different surface syntaxes for different communities
SELECT for the SQL folks, corporate style
select $a / name where $a isa person & is-creator-of (creator: $a, opus: $o, ...) & $o isa document
FLWOR for the XML-heads, integration into XML application servers
for $a in %map // person where is-creator-of (creator: $a, opus: $o, ...) & $o isa document return ($a / name)
Path Expressions for the beardy Perl/UNIX hard-core engineer
%map // person [ . <- creator -> opus ] / name