<?xml version="1.0" encoding="UTF-8"?>

<xs:schema 
xmlns="http://www.ruleml.org/0.9/xsd"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.ruleml.org/0.9/xsd"
>

	<xs:annotation>
		<xs:documentation xml:lang="en">
			XML Schema for a Binary Datalog RuleML sublanguage
			File: bindatalog.xsd
			Version: 0.9
			Last Modification: 2005-11-14
		</xs:documentation>
	</xs:annotation>
	
	<xs:redefine schemaLocation="datalog.xsd">
		<!--
			make atoms binary so that Atom's content model is:
			(
				(oid)?, (op | Rel), (slot)*,
				( (arg|Ind|Data|Skolem|Var|Reify), (arg|Ind|Data|Skolem|Var|Reify), (slot)* )?
			)	     		
	     		
		-->
		<xs:group name="Atom.extend.arg">
			<xs:sequence>
				<xs:choice minOccurs="2" maxOccurs="2">
					<xs:element ref="arg"/>					
					<xs:group ref="arg.content"/>
				</xs:choice>
			</xs:sequence>
		</xs:group>		
	</xs:redefine>
	
</xs:schema>