diff --git a/elements/contacteur.elmt b/elements/contacteur.elmt
index 30994bcab..713ed2278 100644
--- a/elements/contacteur.elmt
+++ b/elements/contacteur.elmt
@@ -1,3 +1,4 @@
+<!DOCTYPE definition SYSTEM "definition_element.dtd">
 <definition	type="element" nom="contacteur" width="15" height="70" hotspot_x="10" hotspot_y="5" orientation="dnny">
 	<ligne x1="-5" y1="19" x2="0" y2="40" antialias="true"  style="normal" />
 	<ligne x1="0"  y1="0"  x2="0" y2="20" antialias="false" style="normal" />
diff --git a/elements/definition_element.dtd b/elements/definition_element.dtd
new file mode 100644
index 000000000..34e2b5e4e
--- /dev/null
+++ b/elements/definition_element.dtd
@@ -0,0 +1,63 @@
+<!ELEMENT definition (borne+|ligne*|cercle*|polygone*)+>
+<!ATTLIST definition
+	type        CDATA #FIXED "element"
+	nom         CDATA #REQUIRED
+	width       CDATA #REQUIRED
+	height      CDATA #REQUIRED
+	hotspot_x   CDATA #REQUIRED
+	hotspot_y   CDATA #REQUIRED
+	orientation CDATA "dnnn"
+>
+
+<!ELEMENT borne    EMPTY>
+<!ATTLIST borne
+	x           CDATA     #REQUIRED
+	y           CDATA     #REQUIRED
+	orientation (n|s|e|o) "n"
+>
+
+<!ELEMENT ligne    EMPTY>
+<!ATTLIST ligne
+	x1         CDATA       #REQUIRED
+	y1         CDATA       #REQUIRED
+	x2         CDATA       #REQUIRED
+	y2         CDATA       #REQUIRED
+	antialias (true|false) "false"
+	style      CDATA       ""
+>
+
+<!ELEMENT cercle   EMPTY>
+<!ATTLIST cercle
+	x         CDATA        #REQUIRED
+	y         CDATA        #REQUIRED
+	rayon     CDATA        #REQUIRED
+	antialias (true|false) "false"
+	style     CDATA        ""
+>
+
+<!ELEMENT polygone EMPTY>
+<!ATTLIST polygone
+	x1          CDATA        #IMPLIED
+	y1          CDATA        #IMPLIED
+	x2          CDATA        #IMPLIED
+	y2          CDATA        #IMPLIED
+	x3          CDATA        #IMPLIED
+	y3          CDATA        #IMPLIED
+	x4          CDATA        #IMPLIED
+	y4          CDATA        #IMPLIED
+	x5          CDATA        #IMPLIED
+	y5          CDATA        #IMPLIED
+	x6          CDATA        #IMPLIED
+	y6          CDATA        #IMPLIED
+	x7          CDATA        #IMPLIED
+	y7          CDATA        #IMPLIED
+	x8          CDATA        #IMPLIED
+	y8          CDATA        #IMPLIED
+	x9          CDATA        #IMPLIED
+	y9          CDATA        #IMPLIED
+	x10         CDATA        #IMPLIED
+	y10         CDATA        #IMPLIED
+	antialias   (true|false) "false"
+	style       CDATA        ""
+>
+
diff --git a/elements/del.elmt b/elements/del.elmt
index db3dad19d..4c2d360fb 100644
--- a/elements/del.elmt
+++ b/elements/del.elmt
@@ -1,3 +1,4 @@
+<!DOCTYPE definition SYSTEM "definition_element.dtd">
 <definition	type="element" nom="del" width="30" height="70" hotspot_x="15" hotspot_y="5" orientation="dnny">
 	<cercle x="-10" y="20" rayon="20"      antialias="true"  style="normal" />
 	<ligne x1="-7" y1="23" x2="7"  y2="37" antialias="true"  style="normal" />
diff --git a/elements/entree.elmt b/elements/entree.elmt
index 4d494f960..8e99e47bb 100644
--- a/elements/entree.elmt
+++ b/elements/entree.elmt
@@ -1,3 +1,4 @@
+<!DOCTYPE definition SYSTEM "definition_element.dtd">
 <definition	type="element" nom="entree" width="20" height="40" hotspot_x="10" hotspot_y="15" orientation="dnny">
 	<polygone x1="-7.5" y1="-13" x2="7.5" y2="-13" x3="0" y3="0" antialias="true" style="normal" />
 	<ligne x1="0"  y1="0" x2="0"  y2="13" antialias="false" style="normal" />