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   1  Attr.ClassUseCDATA
   2  TYPE: bool/null
   3  DEFAULT: null
   4  VERSION: 4.0.0
   5  --DESCRIPTION--
   6  If null, class will auto-detect the doctype and, if matching XHTML 1.1 or
   7  XHTML 2.0, will use the restrictive NMTOKENS specification of class. Otherwise,
   8  it will use a relaxed CDATA definition.  If true, the relaxed CDATA definition
   9  is forced; if false, the NMTOKENS definition is forced.  To get behavior
  10  of HTML Purifier prior to 4.0.0, set this directive to false.
  11  
  12  Some rational behind the auto-detection:
  13  in previous versions of HTML Purifier, it was assumed that the form of
  14  class was NMTOKENS, as specified by the XHTML Modularization (representing
  15  XHTML 1.1 and XHTML 2.0).  The DTDs for HTML 4.01 and XHTML 1.0, however
  16  specify class as CDATA.  HTML 5 effectively defines it as CDATA, but
  17  with the additional constraint that each name should be unique (this is not
  18  explicitly outlined in previous specifications).
  19  --# vim: et sw=4 sts=4