
<!ELEMENT yasyx     (topic)*>
<!ELEMENT topic     (title|subtopicstitle|keywords|syntax|description|(topic|section)*)+>
<!ATTLIST topic
  id      ID        #IMPLIED
  popup   (yes|no)  "no"
  usetitle (yes|no) "yes">

<!ELEMENT title     (#PCDATA)*>
<!ELEMENT subtopicstitle     (#PCDATA)*>

<!ELEMENT keywords  (kwd)*>
<!ELEMENT kwd       (#PCDATA)*>

<!ELEMENT description (para|pre|table)*>
<!ATTLIST description 
  header (yes|no)   "yes">

<!ELEMENT section (para|pre|table|ul)*>
<!ATTLIST section
  title  CDATA      #REQUIRED>

<!ELEMENT para      (#PCDATA|synel|i|link|extlink)*>
<!ELEMENT pre       (line)*>
<!ELEMENT line      (#PCDATA|link|b)*>
<!ELEMENT synel     (#PCDATA|i|link|extlink)*>
<!ELEMENT code      (#PCDATA|b)*>
<!ELEMENT link      (#PCDATA)*>
<!ATTLIST link
  href    CDATA     #IMPLIED
  popup   (yes|no)  "no">
<!ELEMENT extlink   (#PCDATA)*>
<!ATTLIST extlink
  href    CDATA     #REQUIRED>
<!ELEMENT i         (#PCDATA)*>
<!ELEMENT b         (#PCDATA)*>

<!ELEMENT syntax (define)*>

<!ELEMENT define (variant|cases|opt|txt|nt|group)*>
<!ATTLIST define 
  id    ID      #IMPLIED
  inline (yes|no) "no">

<!ELEMENT variant (txt|nt|opt|cases|group)*>
<!ATTLIST variant
  br      (yes|no)  "yes">

<!ELEMENT group (txt|nt|opt|group|cases)*>
<!ATTLIST group
  repeated (yes|no) "no">

<!ELEMENT txt (#PCDATA)>
<!ELEMENT nt (#PCDATA)*>
<!ATTLIST nt
  doc    CDATA #IMPLIED
  name   CDATA #IMPLIED>
<!ELEMENT opt (txt|nt|opt|group)*>
<!ATTLIST opt
  repeated (yes|no) "no">

<!ELEMENT cases (case)+>
<!ATTLIST cases
  repeated (yes|no) "no">

<!ELEMENT case (txt|nt|opt|cases)*>

<!ELEMENT table       (tr)*>
<!ELEMENT tr          (td)*>
<!ELEMENT td          (#PCDATA|b|i|link|extlink|table|code)*>

<!ELEMENT ul          (li)*>
<!ELEMENT li          (#PCDATA|synel|link|extlink|para|pre)*>