# ==================================================================
# Relax NG Schema for XSPF Version 1
# 
# $Id$
# 
# This schema was written as a service for developers who want
# to validate the playlists generated by their applications.
# Nobody claims it is perfect, so if you find bugs please report
# them. In any case, the spec overrides this schema.
# 
# Further information about XSPF is available at http://www.xspf.org
# 
# 
# Copyright (c) 2005 Matthias Friedrich <matt@mafr.de>
# Copyright (c) 2007-2008 Sebastian Pipping <webmaster@hartwork.org>
# 
# The schema is released under the Creative Commons 
# Attribution-ShareAlike 2.5 license.
# 
# http://creativecommons.org/licenses/by-sa/2.5/
# 
# 
# ChangeLog:
#  * 2008-09-03: Allow xml:base attribute everywhere
#                Extract common elements
#                Sebastian Pipping <webmaster@hartwork.org>
# 
#  * 2008-07-26: Support for xml:base attribute
#                Sebastian Pipping <webmaster@hartwork.org>
# 
#  * 2007-02-16: Trang-friendly transformation of def_anything
#                Sebastian Pipping <webmaster@hartwork.org>
# 
#  * 2007-02-16: Interleave wrap for track and playlist
#                to allow arbitrary element order
#                Sebastian Pipping <webmaster@hartwork.org>
# 
#  * 2007-01-07: The info element's content has been changed from
#                type "text" to "anyURI", as per spec.
#                Matthias Friedrich <matt@mafr.de>
# 
#  * 2006-09-25: Fixed an error: the "attribution" element now allows
#                "identifier" child element elements, too.
#                Matthias Friedrich <matt@mafr.de>
# ==================================================================

default namespace = "http://xspf.org/ns/0/"

start = def_playlist-element
xml_base-attribute = attribute xml:base { xsd:anyURI }?
def_title-element = element title { xml_base-attribute, text }
def_creator-element = element creator { xml_base-attribute, text }
def_annotation-element = element annotation { xml_base-attribute, text }
def_info-element = element info { xml_base-attribute, xsd:anyURI }
def_location-element =
  element location { xml_base-attribute, xsd:anyURI }
def_identifier-element =
  element identifier { xml_base-attribute, xsd:anyURI }
def_image-element = element image { xml_base-attribute, xsd:anyURI }
def_link-element =
  element link {
    attribute rel { xsd:anyURI },
    xml_base-attribute,
    xsd:anyURI
  }
def_meta-element =
  element meta {
    attribute rel { xsd:anyURI },
    xml_base-attribute,
    text
  }
def_extension-element =
  element extension {
    attribute application { xsd:anyURI },
    xml_base-attribute,
    (element * { def_anything }
     | text)*
  }
def_playlist-element =
  element playlist {
    attribute version {
      xsd:string { pattern = "1" }
    },
    xml_base-attribute,
    (def_title-element?
     & def_creator-element?
     & def_annotation-element?
     & def_info-element?
     & def_location-element?
     & def_identifier-element?
     & def_image-element?
     & element date { xml_base-attribute, xsd:dateTime }?
     & element license { xml_base-attribute, xsd:anyURI }?
     & def_attribution-element?
     & def_link-element*
     & def_meta-element*
     & def_extension-element*
     & element trackList { xml_base-attribute, def_track-element* })
  }
def_attribution-element =
  element attribution {
    xml_base-attribute, (def_identifier-element | def_location-element)*
  }
def_anything =
  element * { def_anything }*
  & attribute * { text }*
  & text*
def_track-element =
  element track {
    xml_base-attribute,
    (def_location-element*
     & def_identifier-element*
     & def_title-element?
     & def_creator-element?
     & def_annotation-element?
     & def_info-element?
     & def_image-element?
     & element album { xml_base-attribute, text }?
     & element trackNum { xml_base-attribute, xsd:nonNegativeInteger }?
     & element duration { xml_base-attribute, xsd:nonNegativeInteger }?
     & def_link-element*
     & def_meta-element*
     & def_extension-element*)
  }