more thorough clean, exclude build.xml itself

specifications/build.xml

@@ -9,14 +9,17 @@
 			<fileset dir="." includes="**/*.pdf.SAVEME"/>
 			<fileset dir="." includes="**/*.pdf"/>
 			<fileset dir="." includes="**/*.doc"/>
+			<fileset dir="." includes="**/*.htm"/>
             <fileset dir="." includes="**/*.xml">
                 <exclude name="**/build.xml"/>
             </fileset>
 			<fileset dir="." includes="**/*.xsd"/>
 			<fileset dir="." includes="**/*.xsl"/>
-			<fileset dir="SISO-REF-010-v24"/>
-			<fileset dir="." includes="SISO-REF-010-2019 Enumerations v26_files/*"/>
+			<fileset dir="." includes="**/Makefile"/>
+			<fileset dir="." includes="**/README.txt"/>
+			<fileset dir="." includes="**/SISO-REF-010-2019*/*"/>
 		</delete>
+		<delete verbose="true" failonerror="false" dir="SISO-REF-010-2019 Enumerations v26_files"/>
 	</target>
 	
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