_HTML_ Library, _html.ss_
=========================

(require (lib "html.ss" "html")) will provide functions to read
html documents and structures to represent them.

Functions:
==========

> read-xhtml : [Input-port] -> Html

> read-html : [Input-port] -> Html

> read-html-as-xml : [Input-port] -> (listof Content)
  See the XML library for the definition of Content

HTML Structures:
================

Pcdata, Entity, and Attribute are defined in the XML documentation.

> Html-content = Html-element | Pcdata | Entity

> Html-element = any of the structures below which all inherit from
  (define-struct html-element (attributes)).  Any html tag that may
  include content also inherits from
  (define-struct (html-full struct:html-element) (content))
  without adding any additional fields.

A Html is
(make-html (listof Attribute) (listof Contents-of-html))

A Contents-of-html is either
  - Body
  - Head

A Div is
(make-div (listof Attribute) G2)

A Center is
(make-center (listof Attribute) G2)

A Blockquote is
(make-blockquote (listof Attribute) G2)

An Ins is
(make-ins (listof Attribute) G2)

A Del is
(make-del (listof Attribute) G2)

A Dd is
(make-dd (listof Attribute) G2)

A Li is
(make-li (listof Attribute) G2)

A Th is
(make-th (listof Attribute) G2)

A Td is
(make-td (listof Attribute) G2)

An Iframe is
(make-iframe (listof Attribute) G2)

A Noframes is
(make-noframes (listof Attribute) G2)

A Noscript is
(make-noscript (listof Attribute) G2)

A Style is
(make-style (listof Attribute) Cdata)

A Script is
(make-script (listof Attribute) Cdata)

A Basefont is
(make-basefont (listof Attribute))

A Br is
(make-br (listof Attribute))

An Area is
(make-area (listof Attribute))

A Link is
(make-link (listof Attribute))

An Img is
(make-img (listof Attribute))

A Param is
(make-param (listof Attribute))

A Hr is
(make-hr (listof Attribute))

An Input is
(make-input (listof Attribute))

A Col is
(make-col (listof Attribute))

An Isindex is
(make-isindex (listof Attribute))

A Base is
(make-base (listof Attribute))

A Meta is
(make-meta (listof Attribute))

An Option is
(make-option (listof Attribute) Pcdata)

A Textarea is
(make-textarea (listof Attribute) Pcdata)

A Title is
(make-title (listof Attribute) Pcdata)

A Head is
(make-head (listof Attribute) (listof Contents-of-head))

A Contents-of-head is either
  - Base
  - Isindex
  - Link
  - Meta
  - Object
  - Script
  - Style
  - Title

A Tr is
(make-tr (listof Attribute) (listof Contents-of-tr))

A Contents-of-tr is either
  - Td
  - Th

A Colgroup is
(make-colgroup (listof Attribute) Col)

A Thead is
(make-thead (listof Attribute) Tr)

A Tfoot is
(make-tfoot (listof Attribute) Tr)

A Tbody is
(make-tbody (listof Attribute) Tr)

A Tt is
(make-tt (listof Attribute) G5)

An I is
(make-i (listof Attribute) G5)

A B is
(make-b (listof Attribute) G5)

An U is
(make-u (listof Attribute) G5)

A S is
(make-s (listof Attribute) G5)

A Strike is
(make-strike (listof Attribute) G5)

A Big is
(make-big (listof Attribute) G5)

A Small is
(make-small (listof Attribute) G5)

An Em is
(make-em (listof Attribute) G5)

A Strong is
(make-strong (listof Attribute) G5)

A Dfn is
(make-dfn (listof Attribute) G5)

A Code is
(make-code (listof Attribute) G5)

A Samp is
(make-samp (listof Attribute) G5)

A Kbd is
(make-kbd (listof Attribute) G5)

A Var is
(make-var (listof Attribute) G5)

A Cite is
(make-cite (listof Attribute) G5)

An Abbr is
(make-abbr (listof Attribute) G5)

An Acronym is
(make-acronym (listof Attribute) G5)

A Sub is
(make-sub (listof Attribute) G5)

A Sup is
(make-sup (listof Attribute) G5)

A Span is
(make-span (listof Attribute) G5)

A Bdo is
(make-bdo (listof Attribute) G5)

A Font is
(make-font (listof Attribute) G5)

A P is
(make-p (listof Attribute) G5)

A H1 is
(make-h1 (listof Attribute) G5)

A H2 is
(make-h2 (listof Attribute) G5)

A H3 is
(make-h3 (listof Attribute) G5)

A H4 is
(make-h4 (listof Attribute) G5)

A H5 is
(make-h5 (listof Attribute) G5)

A H6 is
(make-h6 (listof Attribute) G5)

A Q is
(make-q (listof Attribute) G5)

A Dt is
(make-dt (listof Attribute) G5)

A Legend is
(make-legend (listof Attribute) G5)

A Caption is
(make-caption (listof Attribute) G5)

A Table is
(make-table (listof Attribute) (listof Contents-of-table))

A Contents-of-table is either
  - Caption
  - Col
  - Colgroup
  - Tbody
  - Tfoot
  - Thead

A Button is
(make-button (listof Attribute) G4)

A Fieldset is
(make-fieldset (listof Attribute) (listof Contents-of-fieldset))

A Contents-of-fieldset is either
  - Legend
  - G2

An Optgroup is
(make-optgroup (listof Attribute) Option)

A Select is
(make-select (listof Attribute) (listof Contents-of-select))

A Contents-of-select is either
  - Optgroup
  - Option

A Label is
(make-label (listof Attribute) G6)

A Form is
(make-form (listof Attribute) G3)

An Ol is
(make-ol (listof Attribute) Li)

An Ul is
(make-ul (listof Attribute) Li)

A Dir is
(make-dir (listof Attribute) Li)

A Menu is
(make-menu (listof Attribute) Li)

A Dl is
(make-dl (listof Attribute) (listof Contents-of-dl))

A Contents-of-dl is either
  - Dd
  - Dt

A Pre is
(make-pre (listof Attribute) (listof Contents-of-pre))

A Contents-of-pre is either
  - G9
  - G11

An Object is
(make-object (listof Attribute) (listof Contents-of-object-applet))

An Applet is
(make-applet (listof Attribute) (listof Contents-of-object-applet))

A Contents-of-object-applet is either
  - Param
  - G2

A Map is
(make-map (listof Attribute) (listof Contents-of-map))

A Contents-of-map is either
  - Area
  - Fieldset
  - Form
  - Isindex
  - G10

An A is
(make-a (listof Attribute) (listof Contents-of-a))

A Contents-of-a is either
  - Label
  - G7

An Address is
(make-address (listof Attribute) (listof Contents-of-address))

A Contents-of-address is either
  - P
  - G5

A Body is
(make-body (listof Attribute) (listof Contents-of-body))

A Contents-of-body is either
  - Del
  - Ins
  - G2

A G12 is either
  - Button
  - Iframe
  - Input
  - Select
  - Textarea

A G11 is either
  - A
  - Label
  - G12

A G10 is either
  - Address
  - Blockquote
  - Center
  - Dir
  - Div
  - Dl
  - H1
  - H2
  - H3
  - H4
  - H5
  - H6
  - Hr
  - Menu
  - Noframes
  - Noscript
  - Ol
  - P
  - Pre
  - Table
  - Ul

A G9 is either
  - Abbr
  - Acronym
  - B
  - Bdo
  - Br
  - Cite
  - Code
  - Dfn
  - Em
  - I
  - Kbd
  - Map
  - Pcdata
  - Q
  - S
  - Samp
  - Script
  - Span
  - Strike
  - Strong
  - Tt
  - U
  - Var

A G8 is either
  - Applet
  - Basefont
  - Big
  - Font
  - Img
  - Object
  - Small
  - Sub
  - Sup
  - G9

A G7 is either
  - G8
  - G12

A G6 is either
  - A
  - G7

A G5 is either
  - Label
  - G6

A G4 is either
  - G8
  - G10

A G3 is either
  - Fieldset
  - Isindex
  - G4
  - G11

A G2 is either
  - Form
  - G3