Function or

or(firstExpression, secondExpression, ...varargs): OGCCondition
Creates a boolean OR expression. It represents a boolean OR evaluation of two or more conditions. It takes any number of parameters, each one being an expression.

Note that combining Identifier expressions with other expressions will result in an error.
```
  FilterFactory.or(
    FilterFactory.lt(
      FilterFactory.property("TOT_POP"),
      FilterFactory.literal(500000)
    ),
    FilterFactory.eq(
     FilterFactory.property("city_name"),
     FilterFactory.literal("New York")
   );
  );
```
Parameters
- firstExpression: Expression
  The first OGCCondition.
- secondExpression: Expression
  The second OGCCondition.
- Rest...varargs: Expression[]
  any number of additional Expression.
Returns OGCCondition
The Or expression.

Throws
Error if not all parameters are Expression