PML Customisation
User Guide
Control Logic : IF Construct : BOOLEAN Expressions and if Statements
New expressions based on the operators such as EQ and GT give a BOOLEAN result that can be used directly in a PML2 if test:
The expression can be a simple variable provided it is a BOOLEAN type variable:
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Note:
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The BOOLEAN constants TRUE, FALSE, YES and NO and their single-letter abbreviations not enclosed in quotes return BOOLEAN results and so can be used directly in expressions. For example:
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The following do not return BOOLEAN values and are therefore invalid:
For upward compatibility with PML1, STRING variables set to ‘TRUE’, ‘FALSE’, ‘YES’ or ‘NO’ or their single-letter abbreviations can be used in an if-test as long as they are evaluated with a preceding $. For example:
