t_Facets_Facet

description : stringFacet descriptioninvariant : booleanTrue to validate the facet only on the object where it is declared, false to validate it on all objects having it.name : identifierFacet nameValid values based on“string”.:?[\p{L}_][\p{L}\p{N}_]*(:[\p{L}_][\p{L}\p{N}_]*)*Value must begin with a letter or an underscore. Case and length are not restricted. Letters, numbers and underscores are allowed. Colon is used as a scope separator. Spaces and other punctuation characters are not allowed.validation : stringValidation expression taking "this" and "value" as arguments and returning #f, a string id, or a list of format arguments if the facet is invalid. Facets may have values tested against a validation script. The validation expression takes "this" (the current faceted object) and "value" (the value of the facet) as its arguments and returns #f, a string id, or a list of format arguments if the facet is invalid. Example (if (not (number? value))    `("ids.numericValueError" ,value) ) ; where ids.numericValueError is "Facet must be numeric. '{0}' is not valid."values : stringList of valid values. Set to () for no value validation.