# Create and Modify Eduction Grammars

Eduction uses grammar files to identify and tag entities in documents. They are written in XML in a format specific to Eduction. They are then compiled, using the Eduction command-line tool, into ECR files that Eduction can easily read at runtime.

Eduction includes a collection of standard grammar files that make it easy to identify common entities such as names and phone numbers. These are described in Standard Grammars.

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