# RELAX NG Compact Schema for RSS 1.1
# Sean B. Palmer, inamidst.com
# Christopher Schmidt, crschmidt.net
# License: This schema is in the public domain

default namespace rss = "http://purl.org/net/rss1.1#"
namespace rdf = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
namespace NoNS = ""

start = Channel

## http://purl.org/net/rss1.1#Channel
Channel = element Channel { Channel.content }

Channel.content = ( 
   AttrXMLLang?, AttrXMLBase?, AttrRDFAbout, 
   (title & link & description & image? & Any* & items)
)

## http://purl.org/net/rss1.1#title
title = element title { title.content }

title.content = ( 
   AttrXMLLang?, text 
)

## http://purl.org/net/rss1.1#link
link = element link { link.content } 

link.content = ( xsd:anyURI )

## http://purl.org/net/rss1.1#description
description = element description { description.content }

description.content = ( 
   AttrXMLLang?, text 
)

## http://purl.org/net/rss1.1#image
image = element image { image.content }

image.content = ( 
   AttrXMLLang?, AttrRDFResource,
   (title & link? & url & Any*)
)

## http://purl.org/net/rss1.1#url
url = element url { url.content }

url.content = ( xsd:anyURI )

## http://purl.org/net/rss1.1#items
items = element items { items.content }

items.content = ( 
   AttrXMLLang?, AttrRDFCollection, 
   item*
)

## http://purl.org/net/rss1.1#item
item = element item { item.content }

item.content = ( 
   AttrXMLLang?, AttrRDFAbout, 
   (title & link & description? & image? & Any*)
)

## http://purl.org/net/rss1.1#Any
Any = element * - ( rss:* ) { Any.content }

Any.content = ( 
   attribute * - ( rss:* | NoNS:* ) { text }*, 
   mixed { Any* }  
)

AttrXMLLang = attribute xml:lang { xsd:language }
AttrXMLBase = attribute xml:base { xsd:anyURI }
AttrRDFAbout = attribute rdf:about { xsd:anyURI }
AttrRDFResource = attribute rdf:parseType { "Resource" }
AttrRDFCollection = attribute rdf:parseType { "Collection" }