default namespace ns1 = "urn:ietf:params:xml:ns:lost-ext"

##
##    Extensions to the Location-to-Service Translation (LoST)
##    Protocol

##
##    LoST Extensions define three new elements: limit, region, and
##    serviceLocation.
##
start =
  limit
  | region
  | serviceLocation

##
##    A limit to the number of returned results.
##
div {
  limit=
    element limit {
      xsd:positiveInteger
    }
}

##
##   A boolean variable to request a search
##   based on either service areas or distance.
##
##   NOTE: The W3C XML Schema has two different
##         lexical representations for boolean:
##         '1' or 'true' vs. '0' or 'false'.
##
div {
  region=
    element region {
      xsd:boolean
    }



Forte & Schulzrinne           Experimental                     [Page 16]


RFC 6451                     LoST Extensions               December 2011


}

##
##    Location Information
##
div {
  locationInformation =
    extensionPoint+,
    attribute profile { xsd:NMTOKEN }?
}

##
##    Location Information about the returned point
##    of service.
##
div {
  serviceLocation=
    element serviceLocation { locationInformation }+
}

##
##    Patterns for inclusion of elements from schemas in
##    other namespaces.
##
div {

  ##
  ##    Any element not in the LoST Extensions
  ##    namespace.
  ##
  notLostExt = element * - (ns1:* | ns1:*) { anyElement }

  ##
  ##    A wildcard pattern for including any element
  ##    from any other namespace.
  ##
  anyElement =
    (element * { anyElement }
     | attribute * { text }
     | text)*

  ##
  ##    A point where future extensions
  ##    (elements from other namespaces)
  ##    can be added.
  ##
  extensionPoint = notLostExt*
}