The reason for the { } is to allow for multiple comma-separated parameters
in the future. If commas are used as separators, then something needs to
delimit any SQL code provided. But I realize this is looking pretty far
ahead.
Formally, the syntax is:
subst := % name [ ( paramList ) ] %
paramList := param [ , param ]
param := simple-string | { complex-string }
>> Yes, syntax is a bit ugly, but it follows the current pattern of using %
>> for parameters. The only change I might suggest is to use:
>>
>> %BBOX({...})%
>>
>> (That is, % delimits the entire substituted expression, which can itself
>> contain parameters with the ( ) block. The { } delimits raw code strings.
>> This syntax would support future extensions fairly well I think)
>>
>>
> I like the idea of % going around the entire code, not sure about the
> double parenthesis ({ })... any specific reason for it?
>
>
>
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