Add multi-data-graph handling to case_validate

References:
* [AC-210] Add validation command to CASE-Utilities-Python

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Author: ajnelson-nist

README.md

@@ -27,7 +27,7 @@ This repository provides `case_validate` as an adaptation of the `pyshacl` comma
 To see a human-readable validation report of an instance-data file:
 
 ```bash
-case_validate input.json
+case_validate input.json [input-2.json ...]
 ```
 
 If `input.json` is not conformant, a report will be emitted, and `case_validate` will exit with status `1`.  (This is a `pyshacl` behavior, where `0` and `1` report validation success.  Status of >`1` is for other errors.)

case_utils/case_validate/__init__.py

@@ -119,12 +119,14 @@ def main() -> None:
       default=sys.stdout,
     )
 
-    parser.add_argument("in_graph")
+    parser.add_argument("in_graph", nargs="+")
 
     args = parser.parse_args()
 
     data_graph = rdflib.Graph()
-    data_graph.parse(args.in_graph)
+    for in_graph in args.in_graph:
+        _logger.debug("in_graph = %r.", in_graph)
+        data_graph.parse(in_graph)
 
     ontology_graph = rdflib.Graph()
     if args.built_version != "none":