This is in essence a clone of LiteralExpression specifically for InputClause
to expose both Text and QName as Form Properties to the Dynamic Forms Engine with specific
labels for "Input expression" and its "TypeRef".
This is in essence a clone of UnaryTests specifically for InputClause
to expose the Text as a Form Property to the Dynamic Forms Engine with a specific
label for "Constraint".
This is in essence a clone of LiteralExpression specifically for OutputClause
to expose the Text as a Form Property to the Dynamic Forms Engine with a specific
label for "Default Output value".
This is in essence a clone of UnaryTests specifically for OutputClause
to expose the Text as a Form Property to the Dynamic Forms Engine with a specific
label for "Output values".