UMLR — Error in Loop fragment deffinition

the textual syntax is wrong:
‘loop[‘(‘ <minint> [‘,’ <maxint> ] ‘)’]
=>
‘loop’[‘(’ <minint> [‘,’ <maxint> ] ‘)’]

If this textual syntax describes the Guard than is also should be able to contain a bool statement (17.6.3.17 Loop).
If this text describes the format of the name, please explain how to distinguish between an InteractionConstraint and a Guard.