HTML通用实体是在哪里定义的？

Question

从HTML DTD

<!ELEMENT A - - (%inline;)* -(A)       -- anchor -->
<!ATTLIST A
  %attrs;                              -- %coreattrs, %i18n, %events --
  charset     %Charset;      #IMPLIED  -- char encoding of linked resource --
  type        %ContentType;  #IMPLIED  -- advisory content type --
  name        CDATA          #IMPLIED  -- named link end --
  href        %URI;          #IMPLIED  -- URI for linked resource --
  hreflang    %LanguageCode; #IMPLIED  -- language code --
  target      %FrameTarget;  #IMPLIED  -- render in this frame --
  rel         %LinkTypes;    #IMPLIED  -- forward link types --
  rev         %LinkTypes;    #IMPLIED  -- reverse link types --
  accesskey   %Character;    #IMPLIED  -- accessibility key character --
  shape       %Shape;        rect      -- for use with client-side image maps --
  coords      %Coords;       #IMPLIED  -- for use with client-side image maps --
  tabindex    NUMBER         #IMPLIED  -- position in tabbing order --
  onfocus     %Script;       #IMPLIED  -- the element got the focus --
  onblur      %Script;       #IMPLIED  -- the element lost the focus --
  >

哪个文件定义了这些实体，例如%LinkTypes;或%Script;？

Answer 1

在linked HTML DTD中有entity declarations，例如

<!ENTITY % LinkTypes "CDATA"
    -- space-separated list of link types
    -->

<!ENTITY % Script "CDATA" -- script expression -->

根据这些声明，您可以看到%LinkTypes;和%Script;都扩展为CDATA (字符数据)；注释为它们的预期形式或用法提供了一些额外的指导。