Binds variable names in expressions to actual data.
Base class that computes the value of an expression for a document.
Expression - result of compiling an expression, which can
evaluate it for a given document. Each expression can have external variables are resolved by
Bindings - abstraction for binding external variables
to a way to get a value for those variables for a particular document (DoubleValuesSource).
SimpleBindings - default implementation of bindings which
provide easy ways to bind sort fields and other expressions to external variables