Zconfig

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- Removed compatibility with Python 2.1 and 2.2.

- Schema components must really be in Python packages; the directory
search has been modified to perform an import to locate the package
rather than incorrectly implementing the search algorithm.

- The default objects use for section values now provide a method
getSectionAttributes(); this returns a list of all the attributes of
the section object which store configuration-defined data (including
information derived from the schema).

- Default information can now be included in a schema for <key
name="+"> and <multikey name="+"> by using <default key="...">.

- More documentation has been added to discuss schema extension.

- Support for a Unicode-free Python has been fixed.

- Derived section types now inherit the datatype of the base type if
no datatype is identified explicitly.

- Derived section types can now override the keytype instead of always
inheriting from their base type.

- <import package='...'/> makes use of the current prefix if the
package name begins witha dot.

- Added two standard datatypes: dotted-name and dotted-suffix.

- Added two standard schema components: ZConfig.components.basic and
ZConfig.components.logger.

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- Configurations can import additional schema components using a new
"%import" directive; this can be used to integrate 3rd-party
components into an application.

- Schemas may be extended using a new "extends" attribute on the
<schema> element.

- Better error messages when elements in a schema definition are
improperly nested.

- The "zconfig" script can now simply verify that a schema definition
is valid, if that's all that's needed.

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- Initial release.