Made patents optional

Signed-off-by: Steve Springett <[email protected]>

Author: stevespringett

schema/bom-1.7.xsd

@@ -8117,7 +8117,7 @@ limitations under the License.
         </xs:annotation>
         <xs:sequence>
             <xs:element name="standards" type="bom:standardsType" minOccurs="0" maxOccurs="1"/>
-            <xs:element name="patents">
+            <xs:element name="patents" minOccurs="0" maxOccurs="1">
                 <xs:complexType>
                     <xs:sequence>
                         <xs:choice minOccurs="0" maxOccurs="unbounded">