}
protected String internalAssertProperty(TestPropertyHolder source, String propertyName,
MessageExchange messageExchange, SubmitContext context) throws AssertionException {
if (!XmlUtils.seemsToBeXml(source.getPropertyValue(propertyName))) {
throw new AssertionException(new AssertionError("Property '" + propertyName
+ "' has value which is not xml!"));
}
return assertContent(source.getPropertyValue(propertyName), context, propertyName);
}