Merge pull request #183 from jkowalleck/fix-182

fix: XML schema 1.4 make all `ref` arguments `type="bom:refType"`

Author: stevespringett

schema/bom-1.4.xsd

@@ -1971,7 +1971,7 @@ limitations under the License.
                         <xs:element name="target">
                             <xs:complexType>
                                 <xs:sequence minOccurs="0" maxOccurs="1">
-                                    <xs:element name="ref" minOccurs="1" maxOccurs="1">
+                                    <xs:element name="ref" type="bom:refType" minOccurs="1" maxOccurs="1">
                                         <xs:annotation>
                                             <xs:documentation>References a component or service by the objects bom-ref.</xs:documentation>
                                         </xs:annotation>