default namespace = "http://docs.oasis-open.org/ns/xri/xrd-1.0"
namespace xrd = "http://docs.oasis-open.org/ns/xri/xrd-1.0"
datatypes xs = "http://www.w3.org/2001/XMLSchema-datatypes"

start = ( XRD | XRDS )

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

non.xrd.element = element * - xrd:* {
	anyelementbody
}

non.xrd.attribute = attribute * - xrd:* { text }

XRDS = element XRDS {
	attribute xrd:ref { xs:anyURI } ?,
	XRD *
}

XRD = element XRD {
	non.xrd.attribute *,
	Expires ?,
	Subject ?,
	( Alias | Property | Link | non.xrd.element ) *
}

Expires = element Expires {
	non.xrd.attribute *,
	xs:dateTime
}

Subject = element Subject {
	non.xrd.attribute *,
	xs:anyURI
}

Alias = element Alias {
	non.xrd.attribute *,
	xs:anyURI
}

Property = element Property {
	attribute xrd:type { xs:anyURI },
	non.xrd.attribute *,
	xs:string
}

Link = element Link {
	attribute xrd:rel { xs:anyURI } ?,
	attribute xrd:type { xs:string } ?,
	(attribute xrd:href { xs:anyURI }
	 | attribute xrd:template { xs:string } ) ?,
	non.xrd.attribute *,
	( Title | Property | non.xrd.element ) *
}

Title = element Title {
	non.xrd.attribute *,
	xs:string
}