Update Axiom version

pom.xml

diff --git a/pom.xml b/pom.xml
index 048f927..c79c3e0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -504,7 +504,7 @@
     <properties>
         <neethi.version>3.0.3</neethi.version>
         <woden.version>1.0M10</woden.version>
-        <axiom.version>1.2.22-SNAPSHOT</axiom.version>
+        <axiom.version>1.2.23-SNAPSHOT</axiom.version>
         <xmlschema.version>2.2.4</xmlschema.version>
         <ant.version>1.7.0</ant.version>
         <antlr.version>2.7.7</antlr.version>