Loads itself from the document represented in the xml Document. If
allowBlank is set to true and the element pertaining to Objects XML Element can't
be found nothing happens otherwise an InvalidXmlException is thrown
Parameters: element - jdom Element holding content Parameters: allowBlank - boolean throws: InvalidXmlException -
validate that the Object is in a correct state to route as part of a complete
document. In this instance is the chart empty. If so the Element is invalid.
If the element is valid return null
DocElementError representing error(s) throws: ResourceUnavailableException -