(module sig mzscheme
  (require (lib "unitsig.ss"))

  (define-signature xml-structs^
    ((struct location (line char offset))
     (struct document (prolog element misc))
     (struct comment (text))
     (struct prolog (misc dtd misc2))
     (struct document-type (name external inlined))
     (struct external-dtd (system))
     (struct external-dtd/public (public))
     (struct external-dtd/system ())
     (struct element (name attributes content))
     (struct attribute (name value))
     (struct pi (target-name instruction))
     (struct source (start stop))
     (struct pcdata (string))
     (struct cdata (string))
     (struct entity (text))
     content?))

  (define-signature writer^
    (write-xml
      display-xml
      write-xml/content
      display-xml/content
      empty-tag-shorthand
      html-empty-tags))

  (define-signature reader^ 
    (read-xml
     read-xml/element
     read-comments
     collapse-whitespace
     (struct exn:xml ())))

  (define-signature xexpr^
    (xml->xexpr
      xexpr->xml
      xexpr->string
      xexpr-drop-empty-attributes
      xexpr?
      correct-xexpr?
      validate-xexpr
      (struct exn:invalid-xexpr (code))
      xexpr-attribute?
      listof?))

  (define-signature extra-xexpr^
    ((open xexpr^) assoc-sort bcompose attribute->srep))

  (define-signature space^ (eliminate-whitespace))

  (provide xml-structs^
	  writer^
	  reader^
	  xexpr^
	  extra-xexpr^
	  space^))