DTD - Entity Declaration

• Location of data

  • internal entities
    <!ENTITY entityname “replacement text”>
  • external entities: parsed and uparsed
    <!ENTITY entityname SYSTEM “URI”>

• Parsed entities - external files that contain XML, can be inserted in the document

• Unparsed entities - mostly binary files, can be used only as attribute values on elements with ENTITY attributes

<!ENTITY picture SYSTEM “mypicture.gif” NDATA gif>

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