diff --git a/dtd/align.rdfs b/dtd/align.rdfs
new file mode 100644
index 0000000000000000000000000000000000000000..28e25d86954be9794995f495d9a8c04e005a3298
--- /dev/null
+++ b/dtd/align.rdfs
@@ -0,0 +1,81 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE rdf:RDF [
+	 <!ENTITY rdf 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'>
+	 <!ENTITY alignment 'http://exmo.inrialpes.fr/align/1.0'>
+	 <!ENTITY rdfs 'http://www.w3.org/TR/1999/PR-rdf-schema-19990303#'>
+]>
+
+<!-- Contributed by Natasha Noy, 2004 -->
+
+<rdf:RDF xmlns:rdf="&rdf;"
+	 xmlns:rdfs="&rdfs;"
+	 xmlns:alignment="&alignment;">
+<rdfs:Class rdf:about="&alignment;Alignment"
+	 rdfs:label="Alignment">
+	<rdfs:subClassOf rdf:resource="&rdfs;Resource"/>
+</rdfs:Class>
+<rdfs:Class rdf:about="&alignment;Cell"
+	 rdfs:label="Cell">
+	<rdfs:subClassOf rdf:resource="&rdfs;Resource"/>
+</rdfs:Class>
+<rdf:Property rdf:about="&alignment;entity1"
+	 rdfs:label="entity1">
+	<rdfs:domain rdf:resource="&alignment;Cell"/>
+	<rdfs:range rdf:resource="&rdfs;Resource"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;entity2"
+	 rdfs:label="entity2">
+	<rdfs:domain rdf:resource="&alignment;Cell"/>
+	<rdfs:range rdf:resource="&rdfs;Resource"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;level"
+	 rdfs:label="level">
+	<rdfs:domain rdf:resource="&alignment;Alignment"/>
+	<rdfs:range rdf:resource="&rdfs;Literal"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;map"
+	 rdfs:label="map">
+	<rdfs:domain rdf:resource="&alignment;Alignment"/>
+	<rdfs:range rdf:resource="&alignment;Cell"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;measure"
+	 rdfs:label="measure">
+	<rdfs:domain rdf:resource="&alignment;Cell"/>
+	<rdfs:range rdf:resource="&rdfs;Literal"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;onto1"
+	 rdfs:label="onto1">
+	<rdfs:domain rdf:resource="&alignment;Alignment"/>
+	<rdfs:range rdf:resource="&rdfs;Literal"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;onto2"
+	 rdfs:label="onto2">
+	<rdfs:domain rdf:resource="&alignment;Alignment"/>
+	<rdfs:range rdf:resource="&rdfs;Literal"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;relation"
+	 rdfs:label="relation">
+	<rdfs:domain rdf:resource="&alignment;Cell"/>
+	<rdfs:range rdf:resource="&rdfs;Literal"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;type"
+	 rdfs:label="type">
+	<rdfs:domain rdf:resource="&alignment;Alignment"/>
+	<rdfs:range rdf:resource="&rdfs;Literal"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;uri1"
+	 rdfs:label="uri1">
+	<rdfs:domain rdf:resource="&alignment;Alignment"/>
+	<rdfs:range rdf:resource="&rdfs;Literal"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;uri2"
+	 rdfs:label="uri2">
+	<rdfs:domain rdf:resource="&alignment;Alignment"/>
+	<rdfs:range rdf:resource="&rdfs;Literal"/>
+</rdf:Property>
+<rdf:Property rdf:about="&alignment;xml"
+	 rdfs:label="xml">
+	<rdfs:domain rdf:resource="&alignment;Alignment"/>
+	<rdfs:range rdf:resource="&rdfs;Literal"/>
+</rdf:Property>
+</rdf:RDF>