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& META* & LINK*"><!ENTITY % head.content "TITLE & ISINDEX? & BASE? & (%head.extra)"><!ELEMENT HEAD O O (%head.content)><!-- <HEAD> Document head --><!ELEMENT TITLE - - (#PCDATA)*><!ATTLIST TITLE %SDAFORM; "Ti" ><!-- <TITLE> Title of document --><!ELEMENT LINK - O EMPTY><!ATTLIST LINK HREF %URI #REQUIRED %linkExtraAttributes; %SDAPREF; "Linked to : #AttVal (TITLE) (URN) (HREF)>" ><!-- <LINK> Link from this document --><!-- <LINK HREF="..."> Address of link destination --><!-- <LINK URN="..."> Lasting name of destination --><!-- <LINK REL=...> Relationship to destination --><!-- <LINK REV=...> Relationship of destination to this --><!-- <LINK TITLE="..."> Title of destination (advisory) --><!-- <LINK METHODS="..."> Operations allowed (advisory) --><!ELEMENT ISINDEX - O EMPTY><!ATTLIST ISINDEX %SDAPREF; "<Para>[Document is indexed/searchable.]</Para>"><!-- <ISINDEX> Document is a searchable index --><!ELEMENT BASE - O EMPTY><!ATTLIST BASE HREF %URI; #REQUIRED ><!-- <BASE> Base context document --><!-- <BASE HREF="..."> Address for this document --><!ELEMENT NEXTID - O EMPTY><!ATTLIST NEXTID N %linkName #REQUIRED ><!-- <NEXTID> Next ID to use for link name --><!-- <NEXTID N=...> Next ID to use for link name --><!ELEMENT META - O EMPTY><!ATTLIST META HTTP-EQUIV NAME #IMPLIED NAME NAME #IMPLIED CONTENT CDATA #REQUIRED ><!-- <META> Generic Metainformation --><!-- <META HTTP-EQUIV=...> HTTP response header name --><!-- <META HTTP-EQUIV=...> Metainformation name --><!-- <META CONTENT="..."> Associated information --><!--======= Document Structure =================--><![ %HTML.Deprecated [ <!ENTITY % html.content "HEAD, BODY, PLAINTEXT?">]]><!ENTITY % html.content "HEAD, BODY"><!ELEMENT HTML O O (%html.content)><!ENTITY % version.attr "VERSION CDATA #FIXED '%HTML.Version;'"><!ATTLIST HTML %version.attr; %SDAFORM; "Book" ><!-- <HTML> HTML Document -->⌨️ 快捷键说明
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