The additional SPARQL features are as follows:
- Optional matching: Unlike traditional relational data stores, where the database schemas and constraints are predefined for the structured representation of data, in the big data word we deal with unstructured datasets. The attributes of the two resources of the same type may be different. Optional matching comes in handy when handling heterogeneous representations of the entities. The OPTIONAL block is used to select the data elements if they exist.
- Alternative matching: Once again, considering the unstructured nature of knowledge assets, alternating matching provides a mechanism to return whichever properties are available.
- UNION: This is in contrast to the OPTIONAL ...
