NGWS SDK Documentation  

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2.3.5 pp-string-literal-character:
Any character except " (U+0022), and white-spacePre-processing identifiers

Pre-processing identifiers employ a grammar similar to the grammar used for regular C# identifiers:

pp-identifier:
pp-available-identifier
pp-available-identifier:
A pp-identifier-or-keyword that is not true or false
pp-identifier-or-keyword:
identifier-start-character identifier-part-charactersopt

The symbols true and false are not legal pre-processing identifiers, and so cannot be defined with #define or undefined with #undef.