LINQ [http://msdn.microsoft.com/data/ref/linq/] stands for 
'''L'''anguage '''IN'''tegrated '''Q'''uery, and is Microsoft's
attempt to integrate a declarative query language into C# and Visual Basic. It
basically provides an [SQL]-like mini-language for specifying queries over a
variety of different data sources, such as relational [database]s, [XML], and
objects.

Similar things can be accomplished in Tcl (and other languages) via [list comprehension]s,
and higher-order enumeration functions such as [map], [filter], [zip] and [fold].

See also tcllib's [treeql], a tree query language.

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