[#20] Add record uri to unit-level entities in dataset

[airnst]

Tickets

[#20]

Justification

Searching for datasets using record URIs can be a use case. Thus, information in abcd:./RecordURI needs to be mapped to the schema:identifier property of a freshly created bioschemas:BioSample entity. In case this URI contains 'http', it can also be added to schema:url of the same entity. Bio samples are added to the schema:about property of the dataset.

Code changes

XSLT file

• Add variable each for unit and record URI.
• For each extracted unit, a BioSample is to be created with the information specified above in Justification.

XML file

• Change a record URI to a non-HTTP identifier in order to test both URI cases.