diff --git a/src/libs/ifc/schema/pattern/v0.2.7.xsd b/src/libs/ifc/schema/pattern/v0.2.7.xsd
index f7e6a556e..519b9e296 100644
--- a/src/libs/ifc/schema/pattern/v0.2.7.xsd
+++ b/src/libs/ifc/schema/pattern/v0.2.7.xsd
@@ -9,7 +9,7 @@
                                 <xs:complexType>
                                  <xs:simpleContent>
                                     <xs:extension base="xs:string">
-                                       <xs:attribute name="extension" type="xs:string"></xs:attribute>
+                                       <xs:attribute name="extension" type="imageExtension"></xs:attribute>
                                     </xs:extension>
                                  </xs:simpleContent>
                                 </xs:complexType>
@@ -349,6 +349,13 @@
         <xs:restriction base="xs:string">
             <xs:pattern value="^(0|([1-9][0-9]*))\.(0|([1-9][0-9]*))\.(0|([1-9][0-9]*))$"/>
         </xs:restriction>
+    </xs:simpleType>
+     <xs:simpleType name="imageExtension">
+        <xs:restriction base="xs:string">
+            <xs:enumeration value="PNG"/>
+            <xs:enumeration value="JPG"/>
+            <xs:enumeration value="BMP"/>
+        </xs:restriction>
     </xs:simpleType>
     <xs:simpleType name="colors">
         <xs:restriction base="xs:string">