# A RELAX NG Grammar for necho
#
# $Id: necho.rnc,v 1.2 2003/07/10 13:55:11 ndw Exp $
#
# Author: Norman Walsh <ndw@nwalsh.com>
# Version: 0.1
#
# Copyright (C) 2003 Norman Walsh. Permission is hereby granted to do anything
# you please with this grammar. No warranty is expressed or implied.

namespace local = ""
namespace necho = "http://example.com/newformat#"
default namespace = "http://example.com/newformat#"

start = feed

common.attrib =
   attribute xml:lang { text* }?,
   attribute xml:base { xsd:anyURI }?,
   anyForeignAttribute*

feed = element feed {
   common.attrib,
   attribute version { text* },
   title,
   subtitle,
   link,
   modified?,
   (entry|anyForeignElement)*
 }

title    = element title    { common.attrib, text* }
subtitle = element subtitle { common.attrib, text* }
summary  = element summary  { common.attrib, text* }
link     = element link     { common.attrib, xsd:anyURI }

modified = element modified { common.attrib, xsd:dateTime }
created  = element created  { common.attrib, xsd:dateTime }
issued   = element issued   { common.attrib, xsd:dateTime }

entry &= element entry { common.attrib,
   title,
   subtitle,
   summary,
   author,
   contributor*,
   link,
   id,
   created?,
   issued,
   modified,
   (content|anyForeignElement)*
}

contributor.content = name, homepage*, weblog*

author      = element author      { common.attrib, contributor.content }
contributor = element contributor { common.attrib, contributor.content }

name     = element name     { common.attrib, text* }
homepage = element homepage { common.attrib, xsd:anyURI }
weblog   = element weblog   { common.attrib, xsd:anyURI }

id       = element id       { common.attrib, xsd:anyURI }

inline.content = element content { common.attrib,
   attribute type     { text* },
   attribute mode     { "escaped" }?,
   (text|anyElement)*
}

outofline.content = element content { common.attrib,
   attribute type     { text* }?,
   attribute src      { xsd:anyURI },
   empty
}

content = inline.content|outofline.content

anyForeignElement =
   element * - necho:*
   {
      (attribute * { text }
       | text
       | anyForeignElement)*
   }

anyForeignAttribute =
   attribute * - (necho:* | local:* | xml:*) { text }

anyElement =
   element *
   {
      (attribute * { text }
       | text
       | anyElement)*
   }