Dynamically create accessor method when given an identifier.
Add ability to get the filetype of the first file contained within the ordered instance.
Add contentType attribute.
Move contentType attribute to descMetadata stream.
add method to get a hash of all ordered instances with a key of contentType
store keys as pluralised symbols.
make sure that you can insert a file at a specific location.
Refactor generic file to enable addition of standard File objects.
Latest work - unfinished.