Examples from "Common Particles Configuration" section of the form reference: form.mustvalue - an optional field is *displayed* as required when form.mustvalue=true Required [element], Single Occurrence, with Simple Type [inline-Form-FieldRequired] localName is [FieldRequired] without namespace Required [element], Single Occurrence, with Simple Type [inline-Form-FieldRequiredMustValueFalse] localName is [FieldRequiredMustValueFalse] without namespace Required [element], Single Occurrence, with Simple Type [inline-Form-FieldRequiredFormEmptyTrue] localName is [FieldRequiredFormEmptyTrue] without namespace Optional [element], Single Occurrence, with Simple Type [inline-Form-FieldOptional] localName is [FieldOptional] without namespace Optional [element], Single Occurrence, with Simple Type [inline-Form-FieldOptionalMustValue] localName is [FieldOptionalMustValue] without namespace Optional [element], Single Occurrence, with Simple Type [inline-Form-FieldOptionalFormEmptyFalse] localName is [FieldOptionalFormEmptyFalse] without namespace Optional [element], Single Occurrence, with Simple Type [inline-Form-FieldOptionalFormRequiredTrue] localName is [FieldOptionalFormRequiredTrue] without namespace Optional [element], Single Occurrence, with Simple Type [inline-Form-FieldOptionalFormEmptyFalseReqTrue] localName is [FieldOptionalFormEmptyFalseReqTrue] without namespace Optional [element], Single Occurrence, with Simple Type [inline-Form-FieldMustValueNoHtml5] localName is [FieldMustValueNoHtml5] without namespace Examples from "Common Particles Configuration" section of the form reference: form.mustvalue - an optional field is *displayed* as required when form.mustvalue=true