GAUDI_API std::ostream & fillStream(std::ostream &s) const 
NumericID numericID() const  noexcept
Returns the numerical ID. 
bool literal() const  noexcept
Is this ID numeric. 
const LiteralID & literalID() const  noexcept
Returns the ID as a LiteralID. 
GAUDI_API LiteralID idAsString() const 
Return ID as string, for both numeric and literal IDs. 
bool numeric() const  noexcept
Is this ID numeric.