BPEVariableMapSerializer bpeVariableSerializer = new BPEVariableMapSerializer();
// Register the BPEL extension points
er.registerSerializer(Definition.class, ExtentionConstants.Q_ELEM_BPEL_PROPERTY, bpelPropSerializer);
er.registerDeserializer(Definition.class, ExtentionConstants.Q_ELEM_BPEL_PROPERTY, bpelPropSerializer);
er.mapExtensionTypes(Definition.class, ExtentionConstants.Q_ELEM_BPEL_PROPERTY, BPELProperty.class);
er.registerSerializer(Definition.class, ExtentionConstants.Q_ELEM_BPEL_PROPERTY_ALIAS, bpelPropAliasSerializer);
er.registerDeserializer(Definition.class, ExtentionConstants.Q_ELEM_BPEL_PROPERTY_ALIAS,
bpelPropAliasSerializer);
er.mapExtensionTypes(Definition.class, ExtentionConstants.Q_ELEM_BPEL_PROPERTY_ALIAS, BPELPropertyAlias.class);