PyTables User's Guide: Hierarchical datasets in Python - Release 1.3.3
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# D.2. Mandatory attributes for a Group

The next attributes are mandatory for group structures:

CLASS

  This attribute should always be set to `'GROUP'` for group structures.

TITLE

  A string where the user can put some description on what is this group used for.

VERSION

  Should contains the string `'1.0'`.

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