# ============================================================
#
# TM/XML
#
# A RELAX-NG schema for TM/XML. This is for TM/XML 1.1, changed
# as proposed in http://code.google.com/p/ontopia/issues/detail?id=138
#
# ============================================================

default namespace = "http://psi.ontopia.net/xml/tm-xml/"
datatypes xsd = "http://www.w3.org/2001/XMLSchema-datatypes"

start = topicmap

topicmap = element * { reifier?, topic* }
  reifier = attribute reifier { text }

topic = element * { ((id, (identifier | locator)*) |
                     (id?, (identifier | locator)+)),
                    (topicname | occurrence | association)* }
  id = attribute id { xsd:ID }
identifier = element identifier { xsd:anyURI }
locator = element locator { xsd:anyURI }

topicname = element * { reifier?, scope?, value, variant* }
  scope = attribute scope { text }
value = element value { text }
variant = element variant { scope, reifier?, datatype?, text }
occurrence = element * { reifier?, scope?, datatype?, text }
  datatype = attribute datatype { xsd:anyURI }

association = unary | binary | nary
unary = element * { reifier?, scope?, role }
  role = attribute role { text }
binary = element * { reifier?, scope?, role, otherrole, topicref }
  otherrole = attribute otherrole { text }
nary = element * { reifier?, scope?, role, assocrole, assocrole+ }
assocrole = element * { topicref }
  topicref = attribute topicref { text }