1b702a2ae3
added tutorial, racket categories relabeled some other categories normalized manual names: de-bolded, changed some names
856 lines
17 KiB
Racket
856 lines
17 KiB
Racket
#lang scribble/doc
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@(require scribble/manual
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scribble/eval
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(for-label html
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xml
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racket/contract))
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@(define xexpr @tech[#:doc '(lib "xml/xml.scrbl")]{X-expression})
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@title{HTML: Parsing Library}
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@defmodule[html]{The @racketmodname[html] library provides
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functions to read html documents and structures to represent them.}
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@deftogether[(
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@defproc[(read-xhtml [port input-port?])
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html?]{}
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@defproc[(read-html [port input-port?])
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html?]{}
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)]{
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Reads (X)HTML from a port, producing an @racket[html] instance.}
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@defproc[(read-html-as-xml [port input-port?])
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(listof content/c)]{
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Reads HTML from a port, producing an @xexpr compatible with the
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@racketmodname[xml] library (which defines @racket[content/c]).}
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@defboolparam[read-html-comments v]{
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If @racket[v] is not @racket[#f], then comments are read and returned. Defaults to @racket[#f].
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}
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@defboolparam[use-html-spec v]{
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If @racket[v] is not @racket[#f], then the HTML must respect the HTML specification
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with regards to what elements are allowed to be the children of
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other elements. For example, the top-level @racket["<html>"]
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element may only contain a @racket["<body>"] and @racket["<head>"]
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element. Defaults to @racket[#f].
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}
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@section{Example}
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@(require (only-in (for-label racket)
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open-input-string string-append
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list cond match apply append map printf define require module)
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(for-label (prefix-in h: html))
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(for-label (prefix-in x: xml)))
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@def+int[
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(module html-example racket
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(code:comment @#,t{Some of the symbols in @racketmodname[html] and @racketmodname[xml] conflict with})
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(code:comment @#,t{each other and with racket/base language, so we prefix})
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(code:comment @#,t{to avoid namespace conflict.})
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(require (prefix-in h: html)
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(prefix-in x: xml))
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(define an-html
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(h:read-xhtml
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(open-input-string
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(string-append
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"<html><head><title>My title</title></head><body>"
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"<p>Hello world</p><p><b>Testing</b>!</p>"
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"</body></html>"))))
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(code:comment @#,t{extract-pcdata: html-content/c -> (listof string)})
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(code:comment @#,t{Pulls out the pcdata strings from some-content.})
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(define (extract-pcdata some-content)
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(cond [(x:pcdata? some-content)
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(list (x:pcdata-string some-content))]
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[(x:entity? some-content)
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(list)]
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[else
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(extract-pcdata-from-element some-content)]))
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(code:comment @#,t{extract-pcdata-from-element: html-element -> (listof string)})
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(code:comment @#,t{Pulls out the pcdata strings from an-html-element.})
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(define (extract-pcdata-from-element an-html-element)
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(match an-html-element
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[(struct h:html-full (attributes content))
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(apply append (map extract-pcdata content))]
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[(struct h:html-element (attributes))
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'()]))
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(printf "~s\n" (extract-pcdata an-html)))
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(require 'html-example)
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]
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@section{HTML Structures}
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@racket[pcdata], @racket[entity], and @racket[attribute] are defined
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in the @racketmodname[xml] documentation.
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@defthing[html-content/c contract?]{
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A @racket[html-content/c] is either
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@itemize[
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@item[@racket[html-element]]
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@item[@racket[pcdata]]
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@item[@racket[entity]]]
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}
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@defstruct[html-element ([attributes (listof attribute)])]{
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Any of the structures below inherits from @racket[html-element].}
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@defstruct[(html-full struct:html-element) ([content (listof html-content/c)])]{
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Any html tag that may include content also inherits from
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@racket[html-full] without adding any additional fields.}
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@defstruct[(mzscheme html-full) ()]{
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A @racket[mzscheme] is special legacy value for the old documentation system.
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}
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@defstruct[(html html-full) ()]{
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A @racket[html] is
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@racket[(make-html (listof attribute) (listof Contents-of-html))]
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}
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A @racket[Contents-of-html] is either
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@itemize[
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@item{@racket[body]}
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@item{@racket[head]}
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]
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@defstruct[(div html-full)()]{
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A @racket[div] is
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@racket[(make-div (listof attribute) (listof G2))]}
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@defstruct[(center html-full)()]{
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A @racket[center] is
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@racket[(make-center (listof attribute) (listof G2))]
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}
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@defstruct[(blockquote html-full) ()]{
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A @racket[blockquote] is
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@racket[(make-blockquote (listof attribute) G2)]
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}
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@defstruct[(ins html-full) ()]{
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An Ins is
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@racket[(make-ins (listof attribute) (listof G2))]
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}
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@defstruct[(del html-full) ()]{
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A @racket[del] is
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@racket[(make-del (listof attribute) (listof G2))]
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}
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@defstruct[(dd html-full) ()]{
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A @racket[dd] is
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@racket[(make-dd (listof attribute) (listof G2))]
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}
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@defstruct[(li html-full) ()]{
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A @racket[li] is
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@racket[(make-li (listof attribute) (listof G2))]
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}
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@defstruct[(th html-full) ()]{
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A @racket[th] is
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@racket[(make-th (listof attribute) (listof G2))]
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}
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@defstruct[(td html-full) ()]{
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A @racket[td] is
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@racket[(make-td (listof attribute) (listof G2))]
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}
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@defstruct[(iframe html-full) ()]{
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An @racket[iframe] is
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@racket[(make-iframe (listof attribute) (listof G2))]
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}
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@defstruct[(noframes html-full) ()]{
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A @racket[noframes] is
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@racket[(make-noframes (listof attribute) (listof G2))]
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}
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@defstruct[(noscript html-full) ()]{
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A @racket[noscript] is
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@racket[(make-noscript (listof attribute) (listof G2))]
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}
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@defstruct[(style html-full) ()]{
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A @racket[style] is
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@racket[(make-style (listof attribute) (listof pcdata))]
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}
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@defstruct[(script html-full) ()]{
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A @racket[script] is
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@racket[(make-script (listof attribute) (listof pcdata))]
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}
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@defstruct[(basefont html-element) ()]{
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A @racket[basefont] is
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@racket[(make-basefont (listof attribute))]
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}
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@defstruct[(br html-element) ()]{
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A @racket[br] is
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@racket[(make-br (listof attribute))]
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}
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@defstruct[(area html-element) ()]{
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An @racket[area] is
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@racket[(make-area (listof attribute))]
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}
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@defstruct[(alink html-element) ()]{
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A @racket[alink] is
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@racket[(make-alink (listof attribute))]
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}
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@defstruct[(img html-element) ()]{
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An @racket[img] is
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@racket[(make-img (listof attribute))]
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}
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@defstruct[(param html-element) ()]{
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A @racket[param] is
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@racket[(make-param (listof attribute))]
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}
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@defstruct[(hr html-element) ()]{
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A @racket[hr] is
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@racket[(make-hr (listof attribute))]
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}
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@defstruct[(input html-element) ()]{
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An @racket[input] is
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@racket[(make-input (listof attribute))]
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}
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@defstruct[(col html-element) ()]{
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A @racket[col] is
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@racket[(make-col (listof attribute))]
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}
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@defstruct[(isindex html-element) ()]{
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An @racket[isindex] is
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@racket[(make-isindex (listof attribute))]
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}
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@defstruct[(base html-element) ()]{
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A @racket[base] is
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@racket[(make-base (listof attribute))]
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}
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@defstruct[(meta html-element) ()]{
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A @racket[meta] is
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@racket[(make-meta (listof attribute))]
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}
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@defstruct[(option html-full) ()]{
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An @racket[option] is
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@racket[(make-option (listof attribute) (listof pcdata))]
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}
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@defstruct[(textarea html-full) ()]{
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A @racket[textarea] is
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@racket[(make-textarea (listof attribute) (listof pcdata))]
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}
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@defstruct[(title html-full) ()]{
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A @racket[title] is
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@racket[(make-title (listof attribute) (listof pcdata))]
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}
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@defstruct[(head html-full) ()]{
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A @racket[head] is
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@racket[(make-head (listof attribute) (listof Contents-of-head))]
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}
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A @racket[Contents-of-head] is either
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@itemize[
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@item[@racket[base]]
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@item[@racket[isindex]]
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@item[@racket[alink]]
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@item[@racket[meta]]
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@item[@racket[object]]
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@item[@racket[script]]
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@item[@racket[style]]
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@item[@racket[title]]
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]
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@defstruct[(tr html-full) ()]{
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A @racket[tr] is
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@racket[(make-tr (listof attribute) (listof Contents-of-tr))]
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}
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A @racket[Contents-of-tr] is either
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@itemize[
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@item[@racket[td]]
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@item[@racket[th]]
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]
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@defstruct[(colgroup html-full) ()]{
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A @racket[colgroup] is
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@racket[(make-colgroup (listof attribute) (listof col))]
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}
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@defstruct[(thead html-full) ()]{
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A @racket[thead] is
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@racket[(make-thead (listof attribute) (listof tr))]
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}
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@defstruct[(tfoot html-full) ()]{
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A @racket[tfoot] is
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@racket[(make-tfoot (listof attribute) (listof tr))]
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}
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@defstruct[(tbody html-full) ()]{
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A @racket[tbody] is
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@racket[(make-tbody (listof attribute) (listof tr))]
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}
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@defstruct[(tt html-full) ()]{
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A @racket[tt] is
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@racket[(make-tt (listof attribute) (listof G5))]
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}
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@defstruct[(i html-full) ()]{
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An @racket[i] is
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@racket[(make-i (listof attribute) (listof G5))]
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}
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@defstruct[(b html-full) ()]{
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A @racket[b] is
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@racket[(make-b (listof attribute) (listof G5))]
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}
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@defstruct[(u html-full) ()]{
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An @racket[u] is
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@racket[(make-u (listof attribute) (listof G5))]
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}
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@defstruct[(s html-full) ()]{
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A @racket[s] is
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@racket[(make-s (listof attribute) (listof G5))]
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}
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@defstruct[(strike html-full) ()]{
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A @racket[strike] is
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@racket[(make-strike (listof attribute) (listof G5))]
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}
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@defstruct[(big html-full) ()]{
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A @racket[big] is
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@racket[(make-big (listof attribute) (listof G5))]
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}
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@defstruct[(small html-full) ()]{
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A @racket[small] is
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@racket[(make-small (listof attribute) (listof G5))]
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}
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@defstruct[(em html-full) ()]{
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An @racket[em] is
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@racket[(make-em (listof attribute) (listof G5))]
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}
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@defstruct[(strong html-full) ()]{
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A @racket[strong] is
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@racket[(make-strong (listof attribute) (listof G5))]
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}
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@defstruct[(dfn html-full) ()]{
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A @racket[dfn] is
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@racket[(make-dfn (listof attribute) (listof G5))]
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}
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@defstruct[(code html-full) ()]{
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A @racket[code] is
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@racket[(make-code (listof attribute) (listof G5))]
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}
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@defstruct[(samp html-full) ()]{
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A @racket[samp] is
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@racket[(make-samp (listof attribute) (listof G5))]
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}
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@defstruct[(kbd html-full) ()]{
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A @racket[kbd] is
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@racket[(make-kbd (listof attribute) (listof G5))]
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}
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@defstruct[(var html-full) ()]{
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A @racket[var] is
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@racket[(make-var (listof attribute) (listof G5))]
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}
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@defstruct[(cite html-full) ()]{
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A @racket[cite] is
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@racket[(make-cite (listof attribute) (listof G5))]
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}
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@defstruct[(abbr html-full) ()]{
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An @racket[abbr] is
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@racket[(make-abbr (listof attribute) (listof G5))]
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}
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@defstruct[(acronym html-full) ()]{
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An @racket[acronym] is
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@racket[(make-acronym (listof attribute) (listof G5))]
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}
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@defstruct[(sub html-full) ()]{
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A @racket[sub] is
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@racket[(make-sub (listof attribute) (listof G5))]
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}
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@defstruct[(sup html-full) ()]{
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A @racket[sup] is
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@racket[(make-sup (listof attribute) (listof G5))]
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}
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@defstruct[(span html-full) ()]{
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A @racket[span] is
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@racket[(make-span (listof attribute) (listof G5))]
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}
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@defstruct[(bdo html-full) ()]{
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A @racket[bdo] is
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@racket[(make-bdo (listof attribute) (listof G5))]
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}
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@defstruct[(font html-full) ()]{
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A @racket[font] is
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@racket[(make-font (listof attribute) (listof G5))]
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}
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@defstruct[(p html-full) ()]{
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A @racket[p] is
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@racket[(make-p (listof attribute) (listof G5))]
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}
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@defstruct[(h1 html-full) ()]{
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A @racket[h1] is
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@racket[(make-h1 (listof attribute) (listof G5))]
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}
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@defstruct[(h2 html-full) ()]{
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A @racket[h2] is
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@racket[(make-h2 (listof attribute) (listof G5))]
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}
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@defstruct[(h3 html-full) ()]{
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A @racket[h3] is
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@racket[(make-h3 (listof attribute) (listof G5))]
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}
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@defstruct[(h4 html-full) ()]{
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A @racket[h4] is
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@racket[(make-h4 (listof attribute) (listof G5))]
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}
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@defstruct[(h5 html-full) ()]{
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A @racket[h5] is
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@racket[(make-h5 (listof attribute) (listof G5))]
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}
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@defstruct[(h6 html-full) ()]{
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A @racket[h6] is
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@racket[(make-h6 (listof attribute) (listof G5))]
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}
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@defstruct[(q html-full) ()]{
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A @racket[q] is
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@racket[(make-q (listof attribute) (listof G5))]
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}
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@defstruct[(dt html-full) ()]{
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A @racket[dt] is
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@racket[(make-dt (listof attribute) (listof G5))]
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}
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@defstruct[(legend html-full) ()]{
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A @racket[legend] is
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@racket[(make-legend (listof attribute) (listof G5))]
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}
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@defstruct[(caption html-full) ()]{
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A @racket[caption] is
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@racket[(make-caption (listof attribute) (listof G5))]
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}
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@defstruct[(table html-full) ()]{
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A @racket[table] is
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@racket[(make-table (listof attribute) (listof Contents-of-table))]
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}
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A @racket[Contents-of-table] is either
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@itemize[
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@item[@racket[caption]]
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@item[@racket[col]]
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@item[@racket[colgroup]]
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@item[@racket[tbody]]
|
|
@item[@racket[tfoot]]
|
|
@item[@racket[thead]]
|
|
]
|
|
|
|
@defstruct[(button html-full) ()]{
|
|
A @racket[button] is
|
|
@racket[(make-button (listof attribute) (listof G4))]
|
|
}
|
|
|
|
|
|
@defstruct[(fieldset html-full) ()]{
|
|
A @racket[fieldset] is
|
|
@racket[(make-fieldset (listof attribute) (listof Contents-of-fieldset))]
|
|
}
|
|
|
|
|
|
A @racket[Contents-of-fieldset] is either
|
|
@itemize[
|
|
@item[@racket[legend]]
|
|
@item{G2}
|
|
]
|
|
|
|
|
|
@defstruct[(optgroup html-full) ()]{
|
|
An @racket[optgroup] is
|
|
@racket[(make-optgroup (listof attribute) (listof option))]
|
|
}
|
|
|
|
|
|
@defstruct[(select html-full) ()]{
|
|
A @racket[select] is
|
|
@racket[(make-select (listof attribute) (listof Contents-of-select))]
|
|
}
|
|
|
|
|
|
A @racket[Contents-of-select] is either
|
|
@itemize[
|
|
@item[@racket[optgroup]]
|
|
@item[@racket[option]]
|
|
]
|
|
|
|
@defstruct[(label html-full) ()]{
|
|
A @racket[label] is
|
|
@racket[(make-label (listof attribute) (listof G6))]
|
|
}
|
|
|
|
|
|
@defstruct[(form html-full) ()]{
|
|
A @racket[form] is
|
|
@racket[(make-form (listof attribute) (listof G3))]
|
|
}
|
|
|
|
|
|
@defstruct[(ol html-full) ()]{
|
|
An @racket[ol] is
|
|
@racket[(make-ol (listof attribute) (listof li))]
|
|
}
|
|
|
|
|
|
@defstruct[(ul html-full) ()]{
|
|
An @racket[ul] is
|
|
@racket[(make-ul (listof attribute) (listof li))]
|
|
}
|
|
|
|
|
|
@defstruct[(dir html-full) ()]{
|
|
A @racket[dir] is
|
|
@racket[(make-dir (listof attribute) (listof li))]
|
|
}
|
|
|
|
|
|
@defstruct[(menu html-full) ()]{
|
|
A @racket[menu] is
|
|
@racket[(make-menu (listof attribute) (listof li))]
|
|
}
|
|
|
|
|
|
@defstruct[(dl html-full) ()]{
|
|
A @racket[dl] is
|
|
@racket[(make-dl (listof attribute) (listof Contents-of-dl))]
|
|
}
|
|
|
|
|
|
A @racket[Contents-of-dl] is either
|
|
@itemize[
|
|
@item[@racket[dd]]
|
|
@item[@racket[dt]]
|
|
]
|
|
|
|
|
|
@defstruct[(pre html-full) ()]{
|
|
A @racket[pre] is
|
|
@racket[(make-pre (listof attribute) (listof Contents-of-pre))]
|
|
}
|
|
|
|
|
|
A @racket[Contents-of-pre] is either
|
|
@itemize[
|
|
@item{G9}
|
|
@item{G11}
|
|
]
|
|
|
|
|
|
@defstruct[(object html-full) ()]{
|
|
An @racket[object] is
|
|
@racket[(make-object (listof attribute) (listof Contents-of-object-applet))]
|
|
}
|
|
|
|
|
|
@defstruct[(applet html-full) ()]{
|
|
An @racket[applet] is
|
|
@racket[(make-applet (listof attribute) (listof Contents-of-object-applet))]
|
|
}
|
|
|
|
|
|
A @racket[Contents-of-object-applet] is either
|
|
@itemize[
|
|
@item[@racket[param]]
|
|
@item{G2}
|
|
]
|
|
|
|
|
|
@defstruct[(-map html-full) ()]{
|
|
A Map is
|
|
@racket[(make--map (listof attribute) (listof Contents-of-map))]
|
|
}
|
|
|
|
|
|
A @racket[Contents-of-map] is either
|
|
@itemize[
|
|
@item[@racket[area]]
|
|
@item[@racket[fieldset]]
|
|
@item[@racket[form]]
|
|
@item[@racket[isindex]]
|
|
@item{G10}
|
|
]
|
|
|
|
|
|
@defstruct[(a html-full) ()]{
|
|
An @racket[a] is
|
|
@racket[(make-a (listof attribute) (listof Contents-of-a))]
|
|
}
|
|
|
|
|
|
A @racket[Contents-of-a] is either
|
|
@itemize[
|
|
@item[@racket[label]]
|
|
@item{G7}
|
|
]
|
|
|
|
@defstruct[(address html-full) ()]{
|
|
An @racket[address] is
|
|
@racket[(make-address (listof attribute) (listof Contents-of-address))]
|
|
}
|
|
|
|
|
|
A @racket[Contents-of-address] is either
|
|
@itemize[
|
|
@item[@racket[p]]
|
|
@item{G5}
|
|
]
|
|
|
|
|
|
@defstruct[(body html-full) ()]{
|
|
A @racket[body] is
|
|
@racket[(make-body (listof attribute) (listof Contents-of-body))]
|
|
}
|
|
|
|
A @racket[Contents-of-body] is either
|
|
@itemize[
|
|
@item[@racket[del]]
|
|
@item[@racket[ins]]
|
|
@item{G2}
|
|
]
|
|
|
|
|
|
A @racket[G12] is either
|
|
@itemize[
|
|
@item[@racket[button]]
|
|
@item[@racket[iframe]]
|
|
@item[@racket[input]]
|
|
@item[@racket[select]]
|
|
@item[@racket[textarea]]
|
|
]
|
|
|
|
|
|
A @racket[G11] is either
|
|
@itemize[
|
|
@item[@racket[a]]
|
|
@item[@racket[label]]
|
|
@item[@racket[G12]]
|
|
]
|
|
|
|
A @racket[G10] is either
|
|
@itemize[
|
|
@item[@racket[address]]
|
|
@item[@racket[blockquote]]
|
|
@item[@racket[center]]
|
|
@item[@racket[dir]]
|
|
@item[@racket[div]]
|
|
@item[@racket[dl]]
|
|
@item[@racket[h1]]
|
|
@item[@racket[h2]]
|
|
@item[@racket[h3]]
|
|
@item[@racket[h4]]
|
|
@item[@racket[h5]]
|
|
@item[@racket[h6]]
|
|
@item[@racket[hr]]
|
|
@item[@racket[menu]]
|
|
@item[@racket[noframes]]
|
|
@item[@racket[noscript]]
|
|
@item[@racket[ol]]
|
|
@item[@racket[p]]
|
|
@item[@racket[pre]]
|
|
@item[@racket[table]]
|
|
@item[@racket[ul]]
|
|
]
|
|
|
|
|
|
A @racket[G9] is either
|
|
@itemize[
|
|
@item[@racket[abbr]]
|
|
@item[@racket[acronym]]
|
|
@item[@racket[b]]
|
|
@item[@racket[bdo]]
|
|
@item[@racket[br]]
|
|
@item[@racket[cite]]
|
|
@item[@racket[code]]
|
|
@item[@racket[dfn]]
|
|
@item[@racket[em]]
|
|
@item[@racket[i]]
|
|
@item[@racket[kbd]]
|
|
@item[@racket[map]]
|
|
@item[@racket[pcdata]]
|
|
@item[@racket[q]]
|
|
@item[@racket[s]]
|
|
@item[@racket[samp]]
|
|
@item[@racket[script]]
|
|
@item[@racket[span]]
|
|
@item[@racket[strike]]
|
|
@item[@racket[strong]]
|
|
@item[@racket[tt]]
|
|
@item[@racket[u]]
|
|
@item[@racket[var]]
|
|
]
|
|
|
|
|
|
A @racket[G8] is either
|
|
@itemize[
|
|
@item[@racket[applet]]
|
|
@item[@racket[basefont]]
|
|
@item[@racket[big]]
|
|
@item[@racket[font]]
|
|
@item[@racket[img]]
|
|
@item[@racket[object]]
|
|
@item[@racket[small]]
|
|
@item[@racket[sub]]
|
|
@item[@racket[sup]]
|
|
@item{G9}
|
|
]
|
|
|
|
|
|
A @racket[G7] is either
|
|
@itemize[
|
|
@item{G8}
|
|
@item{G12}
|
|
]
|
|
|
|
A @racket[G6] is either
|
|
@itemize[
|
|
@item[@racket[a]]
|
|
@item{G7}
|
|
]
|
|
|
|
A @racket[G5] is either
|
|
@itemize[
|
|
@item[@racket[label]]
|
|
@item{G6}
|
|
]
|
|
|
|
A @racket[G4] is either
|
|
@itemize[
|
|
@item{G8}
|
|
@item{G10}
|
|
]
|
|
|
|
A @racket[G3] is either
|
|
@itemize[
|
|
@item[@racket[fieldset]]
|
|
@item[@racket[isindex]]
|
|
@item{G4}
|
|
@item{G11}
|
|
]
|
|
|
|
A @racket[G2] is either
|
|
@itemize[
|
|
@item[@racket[form]]
|
|
@item{G3}
|
|
]
|
|
|