default namespace = "http://www.w3.org/2004/xbl"
namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"

[ xml:lang = "en" ]
grammar {
  start = xbl
  # NOTES:
  #     - this is a simplified schema in that it does not define classes and 
  #       other such constructs that would make it easier to integrate into the
  #       rest of the SVG schema
  #     - I seem to remember there was a bug in my RNG namespace wildcards. If 
  #       so, it has been copied here (I have no reference handy).
  #     - I have followed the descriptions in the spec, so that if it says "zero
  #       or more foo" and then "zero or more bar", then the foos must occur 
  #       before the bars. This can be changed.
  #     - there are some spec issues embedded in the comments
  
  # ... common definitions ..............................................
  id.attrib = attribute id { xsd:ID }?
  # ... elements ........................................................
  xbl = element xbl { definition*, import*, id.attrib }
  definition =
    element definition {
      (attribute ref { xsd:anyURI }
       | (template?,
          handlerGroup?,
          attribute element { xsd:QName })),
      id.attrib
    }
  template =
    element template {
      id.attrib,
      element content {
        attribute includes { text }?,
        id.attrib
      }
    }
  handlerGroup =
    element handlerGroup {
      # the content model for this element mentions ev:listener and svg:handler
      # but is rather unclear as to what should be included here
      id.attrib
    }
  import =
    element import {
      # this should really be either of xlink:href or src
      attribute bindings { xsd:anyURI }?,
      id.attrib
    }
}