code: public boolean contains(QualifiedName name) {
  		Name unit = name.getUnit();
  		// Get information associated with this unit
  		SymbolTable.Group group = symbolTable.get(unit);
  		return group != null && group.isValid(name.getName());
  	}
docs: Check whether a given name is registered. That is, whether or not there is a
  corresponding name or not.
  
  @param name
  @return