The Context class needs to be added, and functionality needs to be developed.

It should reflect the protocols listed here

This class reflects the context for an individual file in a dataset, and so should be instantiated with path to the file in question and the Dataset object for that file.

Functionality that needs to be added:

• schema: Can be accessed from Dataset object
• dataset: Passed on creation
• subject: From entities? Need to develop Subject class?
• path: Generated in the FileParts object
• size: os.path.getsize()?
• entities: Generated in the FileParts object
• datatype: Generated in the FileParts object
• suffix: Generated in the FileParts object
• extension: Generated in the FileParts object
• modality: From datatype?
• sidecar: Needs to use load_sidecar and `walk_back'?
• associations: Need to develop Associations class
• columns: If the current file has .tsv extesion then parse? What to use to parse?
• json: If current file has .json extension then parse using JSON module?
• gzip: Python has in-built gzip module, not sure how to read the header specifically. Need to develop GZip class?
• nifti_header: Need to develop NiftiHeader class. Can use nibabel for most of this, will likely need guidance.
• ome: Need to develop Ome class. Never heard of OME before, so will need guidance.
• tiff: Need to develop Tiff class

I'll start work on the parts that don't require additional classes, but as suggested I'll create stubs for everything else.

@effigies does this look broadly correct?