Add RiskLevel to Risk Matrix concepts

[coolharsh55]

Specs

RISK

New Concept(s)

N/A

Changed Concept(s)

The Risk Matrix concepts in the RISK extension are provided with a suggested value 0..1 and a suggested label that implies there is a risk level. However, in RDF, there is no triple stating the suggested risk level, e.g. as dpv:hasRiskLevel risk:HighRisk. This should be provided in the RISK extension for convenience and so that the risk matrix values can be directly used e.g. in risk assessments and impact reporting documents.

To do this, the relevant source spreadsheet can have an additional column called RiskLevel which contains the following enumeration of 7 values representing Extremely Low to Extremely High so that it covers 7x7 matrix, and whose subset represents the 5x5 and 3x3 matrices: EL,VL,L,M,H,VH,EH. The vocab_schema.py and vocab_func.py files can take these values and generate relevant triples similar to how the RiskConcept events are annotated with categories.