symbol %urlvar% is no more.
it is different from other symbols, it requires more power.
it's a new thing, it's a
macro, and urlvar is the first of this new generation. wow

the syntax is different.
initially i thought to keep the %old syntax%, but this can be ambiguous for the user and slow for the computer (because % is both beginning and ending).
i introduce a new syntax that should be easy to see and to type.
so it would be
{{urlvar|sort}} to read the content of 'sort'.
any suggestion for a different syntax should be adequately justified.
i was uncertain about using {single pairs}, but this way it should be more visbile and hardly collide with other syntaxes. to type twice the same char is fast.
[[double square brackets]] are easier to type, but can easily collide with [section] names in the template.
if this experiment with macros is successful, then user symbols %sym-anything% will be deprecated. they will be subsituted by the macro {{section|name}}.
all this will be since build #139