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Syntax of Form Constraints

Syntactical Ideas:

  • Similar interface for specifying form-fields like in non-positional arguments
    Use e.g. some-field:boolean,required as usual
  • Simple syntax, address non-programmers as well (not so many curley braces like ad_form)
  • Multiple refinements of  form-fields possible
  • Technically: Tcl list of form-field-specs