Double Quotes in Constraint Expressions: Difference between revisions
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(New page: ==DAP 3.2== Double quotes (") can be used to quote any identifier in a Constrain Expression. ==Rationale== Many data sets us identifier names which contain characters other than those ...) |
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Revision as of 19:33, 24 February 2009
DAP 3.2
Double quotes (") can be used to quote any identifier in a Constrain Expression.
Rationale
Many data sets us identifier names which contain characters other than those that qualify as an identifier in a programming language like C. For example, using an ampersand (&) in a variable name will cause a conflict with the meaning of an ampersand as a prefix AND operator in the CE's selection clause. Enclosing the identifier name in double quotes resolves the ambiguity. The same can be said for other DAP/CE meta-characters like the dot (.) which serves as a separator for the name of a Structure, et c., and its fields.
