User:PC-XT/KIS/t

&#123;{}} (|t/[ l])

Usage
{&#123;|:/letter|Aa|param&#125;} produces

To illustrate named parameters, use the following syntax, starting with 2 {&#123;|:/letter|2=Aa|3=param|4=param=value&#125;} produces

Make sure all parameters are numbered after the first named parameter, to avoid things like this: {&#123;|:/letter|2=Aa|3=param=value|4=param|5=param=value&#125;} produces

Using =, instead of numbering, is not supported. :(