private static final QName Q_TARGET
            = new QName(XMLConfigConstants.SYNAPSE_NAMESPACE, "target");
    public Mediator createSpecificMediator(OMElement elem, Properties properties) {
        CalloutMediator callout = new CalloutMediator();
        OMAttribute attServiceURL = elem.getAttribute(ATT_URL);
        OMAttribute attAction     = elem.getAttribute(ATT_ACTION);
        OMElement   configElt     = elem.getFirstChildWithName(Q_CONFIG);
        OMElement   sourceElt     = elem.getFirstChildWithName(Q_SOURCE);
        OMElement   targetElt     = elem.getFirstChildWithName(Q_TARGET);
        if (attServiceURL != null) {
            callout.setServiceURL(attServiceURL.getAttributeValue());
        } else {
            handleException("The 'serviceURL' attribute is required for the Callout mediator");
        }
        if (attAction != null) {
            callout.setAction(attAction.getAttributeValue());
        }
        if (configElt != null) {
            OMAttribute axis2xmlAttr = configElt.getAttribute(ATT_AXIS2XML);
            OMAttribute repoAttr = configElt.getAttribute(ATT_REPOSITORY);
            if (axis2xmlAttr != null && axis2xmlAttr.getAttributeValue() != null) {
                File axis2xml = new File(axis2xmlAttr.getAttributeValue());
                if (axis2xml.exists() && axis2xml.isFile()) {
                    callout.setAxis2xml(axis2xmlAttr.getAttributeValue());
                } else {
                    handleException("Invalid axis2.xml path: " + axis2xmlAttr.getAttributeValue());
                }
            }
            if (repoAttr != null && repoAttr.getAttributeValue() != null) {
                File repo = new File(repoAttr.getAttributeValue());
                if (repo.exists() && repo.isDirectory()) {
                    callout.setClientRepository(repoAttr.getAttributeValue());
                } else {
                    handleException("Invalid repository path: " + repoAttr.getAttributeValue());
                }
            }
        }
        if (sourceElt != null) {
            if (sourceElt.getAttribute(ATT_XPATH) != null) {
                try {
                    callout.setRequestXPath(
                        SynapseXPathFactory.getSynapseXPath(sourceElt, ATT_XPATH));
                } catch (JaxenException e) {
                    handleException("Invalid source XPath : "
                        + sourceElt.getAttributeValue(ATT_XPATH));
                }
            } else if (sourceElt.getAttribute(ATT_KEY) != null) {
                callout.setRequestKey(sourceElt.getAttributeValue(ATT_KEY));
            } else {
                handleException("A 'xpath' or 'key' attribute " +
                    "is required for the Callout 'source'");
            }
        } else {
            handleException("The message 'source' must be specified for a Callout mediator");
        }
        if (targetElt != null) {
            if (targetElt.getAttribute(ATT_XPATH) != null) {
                try {
                    callout.setTargetXPath(
                        SynapseXPathFactory.getSynapseXPath(targetElt, ATT_XPATH));
                } catch (JaxenException e) {
                    handleException("Invalid target XPath : "
                        + targetElt.getAttributeValue(ATT_XPATH));
                }
            } else if (targetElt.getAttribute(ATT_KEY) != null) {
                callout.setTargetKey(targetElt.getAttributeValue(ATT_KEY));
            } else {
                handleException("A 'xpath' or 'key' attribute " +
                    "is required for the Callout 'target'");
            }
        } else {