UML14 — Change syntax of certain pre-defined operations

In the OCL specification, properties of Collections like
'isEmpty', 'size' etc. are defined as operations with
pre and postconditions. Their syntax however is as attributes without
parenthesis.
For consistency it would be more clear to change the sytax of these
predefined operations to use parenthesis as in 'isEmpty()', just
like other operations.
The same holds for operations on other predefined types like
Real::floor.

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