HTML-- Doctype Description:

The HTML-- (ANTIHTML) Doctype is for documents marked-up using the Hypertext Markup Language of the World Wide Web (WWW). 
  Doctype Classes
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     Doctype (Generic Document Type)
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     SGMLNORM
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      HTML
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      HTML-- (ANTIHTML)

The HTML-- doctype is a specialized HTML doctype for creating meta-layered information models over HTML. Since the official standard states that browsers must ignore all unknown tags, custom fields can be interleaved into HTML to encode other structured data in HTML without effecting the presentation.

The parser ignores the standard HTML 3.2 tags inclusive of vendor extensions. Only the complex values of META and BASE are stored. Tags not part of HTML are, on the other hand, stored. Together with META-encoding the HTML-- doctype allows for the flexible development of structured search and retrieval models over collections of HTML.

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