This class is intended as an abstract base class for parsed expression. It contains information about dependencies, errrors, and the original string reprsentation of the expression. That is, the expression without pre-processor variable substitutions.

This is a handle to a column expression. This class is created by the factory methods Create(String), and can be used to retrieve information about the components of the column expression.

Utilities for escaping and unescaping sting literals and names to be used in expressions.