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<?xml version="1.0"?>
<!DOCTYPE gsdoc PUBLIC "-//GNUstep//DTD gsdoc 1.0.4//EN" "http://www.gnustep.org/gsdoc-1_0_4.dtd">
<gsdoc base="NSClassDescription" up="Base">
  <head>
    <title>NSClassDescription class reference</title>
    <author name="Richard Frith-Macdonald">
      <email address="rfm@gnu.org">
        rfm@gnu.org
      </email>
    </author>
    <copy>2000 Free Software Foundation, Inc.</copy>
  </head>
  <body>
    <front><contents /></front>
    <chapter>
      <heading>
        Software documentation for the NSClassDescription
        class
      </heading>
      <class name="NSClassDescription" super="NSObject" ovadd="10.0.0">
        <declared>Foundation/NSClassDescription.h</declared>
        <desc>
          Each instance of this class provides descriptive
          information for an Objective C class. This is
          used for key-value coding, a framework used in Cocoa for
          scripting with Objective-C objects. Scripting is
          available in GNUstep in many ways, however those
          implementations do not make use of class
          descriptions. Therefore the primary purpose of
          this class is to smooth the process of porting between
          GNUstep and other OpenStep-derived systems.
        </desc>
        <method type="NSClassDescription*" factory="yes" ovadd="10.0.0">
          <sel>classDescriptionForClass:</sel>
          <arg type="Class">aClass</arg>
          <desc>
            Returns the class description for <var>aClass</var>
            . If there is no such description available, sends an
            <code>
              NSClassDescriptionNeededForClassNotification
            </code>
            (with <var>aClass</var> as its object) so that
            objects providing class descriptions can register
            one, and tries again to find one. <br /> Returns
            <code>nil</code> if there is no description found.
            <br /> Handles locking to ensure thread safety and
            ensures that the returned object will not be
            destroyed by other threads.
          </desc>
        </method>
        <method type="void" factory="yes" ovadd="10.0.0">
          <sel>invalidateClassDescriptionCache</sel>
          <desc>
            Invalidates the cache of class descriptions so
            the new descriptions will be fetched as required and
            begin to refill the cache. You need this only if you
            suspect that a class description should have
            changed.
          </desc>
        </method>
        <method type="void" factory="yes" ovadd="10.0.0">
          <sel>registerClassDescription:</sel>
          <arg type="NSClassDescription*">aDescription</arg>
          <sel>forClass:</sel>
          <arg type="Class">aClass</arg>
          <desc>
            Registers <var>aDescription</var> for
            <var>aClass</var>... placing it in the cache and
            replacing any previous version.
          </desc>
        </method>
        <method type="NSArray*" override="subclass" ovadd="10.0.0">
          <sel>attributeKeys</sel>
          <desc>
            Returns the attribute keys - default implementation
            returns <code>nil</code>.
          </desc>
        </method>
        <method type="NSString*" override="subclass" ovadd="10.0.0">
          <sel>inverseForRelationshipKey:</sel>
          <arg type="NSString*">aKey</arg>
          <desc>
            Returns the inverse relationship keys - default
            implementation returns <code>nil</code>.
          </desc>
        </method>
        <method type="NSArray*" override="subclass" ovadd="10.0.0">
          <sel>toManyRelationshipKeys</sel>
          <desc>
            Returns the to many relationship keys - default
            implementation returns <code>nil</code>.
          </desc>
        </method>
        <method type="NSArray*" override="subclass" ovadd="10.0.0">
          <sel>toOneRelationshipKeys</sel>
          <desc>
            Returns the to one relationship keys - default
            implementation returns <code>nil</code>.
          </desc>
        </method>
      </class>
    </chapter>
    <chapter>
      <heading>
        Software documentation for the
        NSObject(NSClassDescriptionPrimitives)
        category
      </heading>
      <category name="NSClassDescriptionPrimitives" class="NSObject" ovadd="10.0.0">
        <declared>Foundation/NSClassDescription.h</declared>
        <desc>
          <em>Description forthcoming.</em>
        </desc>
        <method type="NSArray*" ovadd="10.0.0">
          <sel>attributeKeys</sel>
          <desc>
            Returns the attribute keys supplied by the
            <ref id="NSClassDescription" type="class" />
            object for the receivers class.
          </desc>
        </method>
        <method type="NSClassDescription*" ovadd="10.0.0">
          <sel>classDescription</sel>
          <desc>
            Returns the
            <ref id="NSClassDescription" type="class" />
            object for the receivers class.
          </desc>
        </method>
        <method type="NSString*" ovadd="10.0.0">
          <sel>inverseForRelationshipKey:</sel>
          <arg type="NSString*">aKey</arg>
          <desc>
            Returns the inverse relationship keys supplied by
            the <ref id="NSClassDescription" type="class" /> object
            for the receivers class.
          </desc>
        </method>
        <method type="NSArray*" ovadd="10.0.0">
          <sel>toManyRelationshipKeys</sel>
          <desc>
            Returns the to many relationship keys supplied by
            the <ref id="NSClassDescription" type="class" /> object
            for the receivers class.
          </desc>
        </method>
        <method type="NSArray*" ovadd="10.0.0">
          <sel>toOneRelationshipKeys</sel>
          <desc>
            Returns the to one relationship keys supplied by
            the <ref id="NSClassDescription" type="class" /> object
            for the receivers class.
          </desc>
        </method>
      </category>
    </chapter>
  </body>
</gsdoc>

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