fix: add properties to xml schema 1.4

Signed-off-by: Mike de Senna <[email protected]>

Author: desenna

schema/bom-1.4.xsd

@@ -2014,6 +2014,16 @@ limitations under the License.
                     </xs:sequence>
                 </xs:complexType>
             </xs:element>
+            <xs:element name="properties" type="bom:propertiesType" minOccurs="0" maxOccurs="1">
+                <xs:annotation>
+                    <xs:documentation>Provides the ability to document properties in a key/value store.
+                        This provides flexibility to include data not officially supported in the standard
+                        without having to use additional namespaces or create extensions. Property names
+                        of interest to the general public are encouraged to be registered in the
+                        CycloneDX Property Taxonomy - https://github.com/CycloneDX/cyclonedx-property-taxonomy.
+                        Formal registration is OPTIONAL.</xs:documentation>
+                </xs:annotation>
+            </xs:element>
         </xs:sequence>
         <xs:attribute name="bom-ref" type="bom:refType">
             <xs:annotation>