XML Method Cache Manager - Add : Create a Cache Manager

  XML Method Cache Manager is a Zope object that caches the results
  of processing done by a set of xxxMethod objects (only XSLTMethod
  as of today).  A particular Cache Manager serves the set of
  xxxMethod instances within its parent folder and all subfolders
  (its clients).

  In contrast to Zope's built-in caching objects, XML Method Cache
  Manager is specialized for use with xxxMethod objects.  That
  is, it will notice when either an XML source object or XSLT
  transformer object have changed, and invalidate the cache file
  representing the results of that particular transformation.  Also,
  the CacheManager stores cached content in the filesystem, *not* in
  the Zope object database.

  By default, XSLTMethod never caches its results.  However, XSLT
  processing is expensive.  In the real world, there is generally no
  need to transform the content every time except in rare
  circumstances such as when the XML content is retrieved from a
  database on the fly and changes dynamically.  For all but these
  rare circumstances, caching can improve performance considerably.
  This is what CacheManager is for.

  An xxxMethod object searches for a CacheManager instance via
  acquisition.  That is, it looks for it in its parent folder, than
  its parent's parent, on up the tree to the root folder, and stops
  when it finds the first one.

  A CacheManager is a purely optional thing.  Removing one will
  *never* break anything -- it is purely an optimization, because
  XSLT transformations (or other XML processing) can be expensive.

  Every xxxMethod object has a "caching behavior" property.  This
  controls whether caching should be done *if* a CacheManager is
  present.  If a Cache Manager is *not* present, caching will never
  be done, regardless of the setting of the property.  The property
  is there to guard against those situations where caching is
  *never* appropriate, such as when dynamic content is obtained from
  a database as described above.

  If an xxxMethod "caching" property is set to "on" *and* a
  CacheManager is present, caching will be done.

  A Cache Manager stores the results of transformations in files on
  the disk, as specified in the *cachePrefix* property.  Optionally, a
  Cache Manager may also perform other functions on its client
  XSLTMethod objects.  These functions may be either invoked
  programmatically or from the Cache Manager's "Cache" tab in the Zope
  Management Interface.

  See the readme and tutorial files for more information.

  Entry Fields

    'Zope ID' -- The standard Zope object identifier.  This must not
      be left blank.

    'Title' -- The optional title of the cache manager object.
  
    'Description' -- The optional description of the cache manager
      object.
