Function eq

eq(firstExpression, secondExpression, matchCase?, matchAction?): OGCCondition
Creates a condition that evaluates to true when both expressions are equal.
```
  FilterFactory.eq(
    FilterFactory.property( "city_name" ),
    FilterFactory.literal( "New York" )
  );

  FilterFactory.eq(
    FilterFactory.func( "getCityNames" ),
    FilterFactory.literal( "New York" ),
    false,
    MatchAction.ANY
  );
```
Parameters
- firstExpression: Expression
  the first expression
- secondExpression: Expression
  the second expression
- OptionalmatchCase: boolean
  indicates whether this comparison operator is case sensitive or not. If omitted the string comparisons shall match case.
- OptionalmatchAction: MatchAction
  specifies how the comparison shall be evaluated for a collection of values. Please refer to the MatchAction class for more details.
  Note: This parameter has been introduced in the OGC Filter specification 2.0.0
Returns OGCCondition
A BinaryComparison of type "Equals".

Throws
Error if not both expressions are OGCExpression.