* Returns the content-type property.
* @param fobj The FObj to which the property belongs.
* @return The content-type property.
*/
public String traitContentType(final FObj fobj) {
final PdContentType property = (PdContentType) getProperty(
FoProperty.CONTENT_TYPE);
if (property != null) {
return property.getValue(fobj);
}
return PdContentType.getValueNoInstance();
}