* @todo better There must be some way of doing this automatically (and if not, there should be).
* @return An empty instance of the default metadata type for this policy,
* or null if one could not be created
*/
private MetaDataBuilder getDefaultMetaDataBuilder() {
MetaDataBuilder metaDataBuilder = null;
PolicyType policyType = context.getPolicyType();
if (policyType == VariablePolicyType.TEXT) {
metaDataBuilder = POLICY_FACTORY.createTextMetaDataBuilder();
} else if (policyType == VariablePolicyType.CHART) {
metaDataBuilder = POLICY_FACTORY.createChartMetaDataBuilder();