Backed out changeset 4dc72bbf9ed2 (need more discussion + delegate)

pep-0345.txt

@@ -26,7 +26,7 @@ Version 1.1 is specified in PEP 314.
 Version 1.2 of the metadata format adds a number of optional fields
 designed to make third-party packaging of Python Software easier.
 These fields are "Requires-Python", "Requires-External", "Requires-Dist",
-"Provides-Dist", "Provides-Extra", and "Obsoletes-Dist".  This version also changes the
+"Provides-Dist", and "Obsoletes-Dist".  This version also changes the
 "Platform" field. Three new fields were also added: "Maintainer",
 "Maintainer-email" and "Project-URL".
 
@@ -395,36 +395,6 @@ Example::
 The label is a free text limited to 32 signs.
 
 
-Provides-Extra (multiple use)
-:::::::::::::::::::::::::::::
-
-A string containing the name of an optional feature. Must be a valid Python
-identifier. May be used to make a dependency conditional on whether the
-optional feature has been requested.
-
-Example::
-
-    Provides-Extra: pdf
-    Requires-Dist: reportlab; extra == 'pdf'
-
-A second distribution requires an optional dependency by placing it
-inside square brackets, and can request multiple features by separating
-them with a comma (,). The requirements are evaluated for each requested
-feature and added to the set of requirements for the distribution.
-
-Example::
-
-    Requires-Dist: beaglevote[pdf]
-    Requires-Dist: libexample[test, doc]
-
-Two feature names `test` and `doc` are reserved to mark dependencies that
-are needed for running automated tests and generating documentation,
-respectively.
-
-It is legal to specify `Provides-Extra:` without referencing it in any
-`Requires-Dist:`.
-
-
 Version Specifiers
 ==================
 
@@ -463,8 +433,6 @@ Some Examples:
 
 - ``Requires-Dist: zope.interface (3.1)``: any version that starts with 3.1,
   excluding post or pre-releases.
-- ``Requires-Dist: zope.interface (==3.1)``: equivalent to ``Requires-Dist:
-  zope.interface (3.1)``.
 - ``Requires-Dist: zope.interface (3.1.0)``: any version that starts with
   3.1.0, excluding post or pre-releases. Since that particular project doesn't
   use more than 3 digits, it also means "only the 3.1.0 release".
@@ -517,7 +485,6 @@ where ``EXPR`` belongs to any of those:
 - platform.machine = platform.machine()
 - platform.python_implementation = platform.python_implementation()
 - a free string, like ``'2.4'``, or ``'win32'``
-- extra = (name of requested feature)
 
 Notice that ``in`` is restricted to strings, meaning that it is not possible
 to use other sequences like tuples or lists on the right side.
@@ -551,7 +518,6 @@ Summary of Differences From PEP 314
   - Requires-External
   - Requires-Dist
   - Provides-Dist
-  - Provides-Extra
   - Obsoletes-Dist
   - Project-URL