diff --git a/case_utils/case_validate/__init__.py b/case_utils/case_validate/__init__.py
index eb2fdbf..4132c01 100644
--- a/case_utils/case_validate/__init__.py
+++ b/case_utils/case_validate/__init__.py
@@ -1,13 +1,16 @@
 #!/usr/bin/env python3
 
+# Portions of this file contributed by NIST are governed by the following
+# statement:
+#
 # This software was developed at the National Institute of Standards
 # and Technology by employees of the Federal Government in the course
-# of their official duties. Pursuant to title 17 Section 105 of the
-# United States Code this software is not subject to copyright
-# protection and is in the public domain. NIST assumes no
-# responsibility whatsoever for its use by other parties, and makes
-# no guarantees, expressed or implied, about its quality,
-# reliability, or any other characteristic.
+# of their official duties. Pursuant to Title 17 Section 105 of the
+# United States Code, this software is not subject to copyright
+# protection within the United States. NIST assumes no responsibility
+# whatsoever for its use by other parties, and makes no guarantees,
+# expressed or implied, about its quality, reliability, or any other
+# characteristic.
 #
 # We would appreciate acknowledgement if the software is used.
 
@@ -32,141 +35,105 @@
 __version__ = "0.3.0"
 
 import argparse
-import importlib.resources
 import logging
 import os
 import sys
 import warnings
-from typing import Dict, Set, Tuple, Union
+from typing import Any, Dict, List, Optional, Tuple, Union
 
 import pyshacl  # type: ignore
 import rdflib
+from rdflib import Graph
 
-import case_utils.ontology
+from case_utils.case_validate.validate_types import (
+    NonExistentCDOConceptWarning,
+    ValidationResult,
+)
+from case_utils.case_validate.validate_utils import (
+    get_invalid_cdo_concepts,
+    get_ontology_graph,
+)
 from case_utils.ontology.version_info import (
     CURRENT_CASE_VERSION,
     built_version_choices_list,
 )
 
-NS_OWL = rdflib.OWL
-NS_RDF = rdflib.RDF
-NS_RDFS = rdflib.RDFS
-NS_SH = rdflib.SH
-
 _logger = logging.getLogger(os.path.basename(__file__))
 
 
-class NonExistentCDOConceptWarning(UserWarning):
+def validate(
+    input_file: Union[List[str], str],
+    *args: Any,
+    case_version: Optional[str] = None,
+    supplemental_graphs: Optional[List[str]] = None,
+    **kwargs: Any,
+) -> ValidationResult:
     """
-    This class is used when a concept is encountered in the data graph that is not part of CDO ontologies, according to the --built-version flags and --ontology-graph flags.
+    Validate the given data graph against the given CASE ontology version and supplemental graphs.
+
+    :param *args: The positional arguments to pass to the underlying pyshacl.validate function.
+    :param input_file: The path to the file containing the data graph to validate.  This can also be a list of paths to files containing data graphs to pool together.
+    :param case_version: The version of the CASE ontology to use (e.g. 1.2.0).  If None, the most recent version will be used.
+    :param supplemental_graphs: File paths to supplemental graphs to use.  If None, no supplemental graphs will be used.
+    :param allow_warnings: In addition to affecting the conformance of SHACL validation, this will affect conformance based on unrecognized CDO concepts (likely, misspelled or miscapitalized) in the data graph.  If allow_warnings is not True, any unrecognized concept using a CDO IRI prefix will cause conformance to be False.
+    :param inference: The type of inference to use.  If "none" (type str), no inference will be used.  If None (type NoneType), pyshacl defaults will be used.  Note that at the time of this writing (pySHACL 0.23.0), pyshacl defaults are no inferencing for the data graph, and RDFS inferencing for the SHACL graph, which for case_utils.validate includes the SHACL and OWL graphs.
+    :param **kwargs: The keyword arguments to pass to the underlying pyshacl.validate function.
+    :return: The validation result object containing the defined properties.
     """
+    # Convert the data graph string to a rdflib.Graph object.
+    data_graph = rdflib.Graph()
+    if isinstance(input_file, str):
+        data_graph.parse(input_file)
+    elif isinstance(input_file, list):
+        for _data_graph_file in input_file:
+            _logger.debug("_data_graph_file = %r.", _data_graph_file)
+            if not isinstance(_data_graph_file, str):
+                raise TypeError("Expected str, received %s." % type(_data_graph_file))
+            data_graph.parse(_data_graph_file)
+
+    # Get the ontology graph from the case_version and supplemental_graphs arguments
+    ontology_graph: Graph = get_ontology_graph(case_version, supplemental_graphs)
+
+    # Get the undefined CDO concepts.
+    undefined_cdo_concepts = get_invalid_cdo_concepts(data_graph, ontology_graph)
 
-    pass
+    # Warn about typo'd concepts before performing SHACL review.
+    for undefined_cdo_concept in sorted(undefined_cdo_concepts):
+        warnings.warn(undefined_cdo_concept, NonExistentCDOConceptWarning)
+    undefined_cdo_concepts_message = (
+        "There were %d concepts with CDO IRIs in the data graph that are not in the ontology graph."
+        % len(undefined_cdo_concepts)
+    )
 
+    # Validate data graph against ontology graph.
+    validate_result: Tuple[
+        bool, Union[Exception, bytes, str, rdflib.Graph], str
+    ] = pyshacl.validate(
+        data_graph,
+        *args,
+        ont_graph=ontology_graph,
+        shacl_graph=ontology_graph,
+        **kwargs,
+    )
 
-def concept_is_cdo_concept(n_concept: rdflib.URIRef) -> bool:
-    concept_iri = str(n_concept)
-    return concept_iri.startswith(
-        "https://ontology.unifiedcyberontology.org/"
-    ) or concept_iri.startswith("https://ontology.caseontology.org/")
+    # Relieve RAM of the data graph after validation has run.
+    del data_graph
 
+    conforms = validate_result[0]
 
-def get_invalid_cdo_concepts(
-    data_graph: rdflib.Graph, ontology_graph: rdflib.Graph
-) -> Set[rdflib.URIRef]:
-    """
-    Get the set of concepts in the data graph that are not part of the CDO ontologies as specified with the ontology_graph argument.
-
-    :param data_graph: The data graph to validate.
-    :param ontology_graph: The ontology graph to use for validation.
-    :return: The list of concepts in the data graph that are not part of the CDO ontology.
-
-    >>> from case_utils.namespace import NS_RDF, NS_OWL, NS_UCO_CORE
-    >>> from rdflib import Graph, Literal, Namespace, URIRef
-    >>> # Define a namespace for a knowledge base, and a namespace for custom extensions.
-    >>> ns_kb = Namespace("http://example.org/kb/")
-    >>> ns_ex = Namespace("http://example.org/ontology/")
-    >>> dg = Graph()
-    >>> og = Graph()
-    >>> # Use an ontology graph in review that includes only a single class and a single property excerpted from UCO, but also a single custom property.
-    >>> _ = og.add((NS_UCO_CORE.UcoObject, NS_RDF.type, NS_OWL.Class))
-    >>> _ = og.add((NS_UCO_CORE.name, NS_RDF.type, NS_OWL.DatatypeProperty))
-    >>> _ = og.add((ns_ex.ourCustomProperty, NS_RDF.type, NS_OWL.DatatypeProperty))
-    >>> # Define an individual.
-    >>> n_uco_object = ns_kb["UcoObject-f494d239-d9fd-48da-bc07-461ba86d8c6c"]
-    >>> n_uco_object
-    rdflib.term.URIRef('http://example.org/kb/UcoObject-f494d239-d9fd-48da-bc07-461ba86d8c6c')
-    >>> # Review a data graph that includes only the single individual, class typo'd (capitalized incorrectly), but property OK.
-    >>> _ = dg.add((n_uco_object, NS_RDF.type, NS_UCO_CORE.UCOObject))
-    >>> _ = dg.add((n_uco_object, NS_UCO_CORE.name, Literal("Test")))
-    >>> _ = dg.add((n_uco_object, ns_ex.customProperty, Literal("Custom Value")))
-    >>> invalid_cdo_concepts = get_invalid_cdo_concepts(dg, og)
-    >>> invalid_cdo_concepts
-    {rdflib.term.URIRef('https://ontology.unifiedcyberontology.org/uco/core/UCOObject')}
-    >>> # Note that the property "ourCustomProperty" was typo'd in the data graph, but this was not reported.
-    >>> assert ns_ex.ourCustomProperty not in invalid_cdo_concepts
-    """
-    # Construct set of CDO concepts for data graph concept-existence review.
-    cdo_concepts: Set[rdflib.URIRef] = set()
-
-    for n_structural_class in [
-        NS_OWL.Class,
-        NS_OWL.AnnotationProperty,
-        NS_OWL.DatatypeProperty,
-        NS_OWL.ObjectProperty,
-        NS_RDFS.Datatype,
-        NS_SH.NodeShape,
-        NS_SH.PropertyShape,
-        NS_SH.Shape,
-    ]:
-        for ontology_triple in ontology_graph.triples(
-            (None, NS_RDF.type, n_structural_class)
-        ):
-            if not isinstance(ontology_triple[0], rdflib.URIRef):
-                continue
-            if concept_is_cdo_concept(ontology_triple[0]):
-                cdo_concepts.add(ontology_triple[0])
-    for n_ontology_predicate in [
-        NS_OWL.backwardCompatibleWith,
-        NS_OWL.imports,
-        NS_OWL.incompatibleWith,
-        NS_OWL.priorVersion,
-        NS_OWL.versionIRI,
-    ]:
-        for ontology_triple in ontology_graph.triples(
-            (None, n_ontology_predicate, None)
-        ):
-            assert isinstance(ontology_triple[0], rdflib.URIRef)
-            assert isinstance(ontology_triple[2], rdflib.URIRef)
-            cdo_concepts.add(ontology_triple[0])
-            cdo_concepts.add(ontology_triple[2])
-    for ontology_triple in ontology_graph.triples((None, NS_RDF.type, NS_OWL.Ontology)):
-        if not isinstance(ontology_triple[0], rdflib.URIRef):
-            continue
-        cdo_concepts.add(ontology_triple[0])
-
-    # Also load historical ontology and version IRIs.
-    ontology_and_version_iris_data = importlib.resources.read_text(
-        case_utils.ontology, "ontology_and_version_iris.txt"
+    if len(undefined_cdo_concepts) > 0:
+        warnings.warn(undefined_cdo_concepts_message)
+        if not kwargs.get("allow_warnings"):
+            undefined_cdo_concepts_alleviation_message = "The data graph is SHACL-conformant with the CDO ontologies, but nonexistent-concept references raise Warnings with this tool.  Please either correct the concept names in the data graph; use the --ontology-graph flag to pass a corrected CDO ontology file, also using --built-version none; or, use the --allow-warnings flag."
+            warnings.warn(undefined_cdo_concepts_alleviation_message)
+            conforms = False
+
+    return ValidationResult(
+        conforms,
+        validate_result[1],
+        validate_result[2],
+        undefined_cdo_concepts,
     )
-    for line in ontology_and_version_iris_data.split("\n"):
-        cleaned_line = line.strip()
-        if cleaned_line == "":
-            continue
-        cdo_concepts.add(rdflib.URIRef(cleaned_line))
-
-    data_cdo_concepts: Set[rdflib.URIRef] = set()
-    for data_triple in data_graph.triples((None, None, None)):
-        for data_triple_member in data_triple:
-            if isinstance(data_triple_member, rdflib.URIRef):
-                if concept_is_cdo_concept(data_triple_member):
-                    data_cdo_concepts.add(data_triple_member)
-            elif isinstance(data_triple_member, rdflib.Literal):
-                if isinstance(data_triple_member.datatype, rdflib.URIRef):
-                    if concept_is_cdo_concept(data_triple_member.datatype):
-                        data_cdo_concepts.add(data_triple_member.datatype)
-
-    return data_cdo_concepts - cdo_concepts
 
 
 def main() -> None:
@@ -263,32 +230,6 @@ def main() -> None:
 
     args = parser.parse_args()
 
-    data_graph = rdflib.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":
-        ttl_filename = args.built_version + ".ttl"
-        _logger.debug("ttl_filename = %r.", ttl_filename)
-        ttl_data = importlib.resources.read_text(case_utils.ontology, ttl_filename)
-        ontology_graph.parse(data=ttl_data, format="turtle")
-    if args.ontology_graph:
-        for arg_ontology_graph in args.ontology_graph:
-            _logger.debug("arg_ontology_graph = %r.", arg_ontology_graph)
-            ontology_graph.parse(arg_ontology_graph)
-
-    # Get the list of undefined CDO concepts in the graph
-    undefined_cdo_concepts = get_invalid_cdo_concepts(data_graph, ontology_graph)
-
-    for undefined_cdo_concept in sorted(undefined_cdo_concepts):
-        warnings.warn(undefined_cdo_concept, NonExistentCDOConceptWarning)
-    undefined_cdo_concepts_message = (
-        "There were %d concepts with CDO IRIs in the data graph that are not in the ontology graph."
-        % len(undefined_cdo_concepts)
-    )
-
     # Determine output format.
     # pySHACL's determination of output formatting is handled solely
     # through the -f flag.  Other CASE CLI tools handle format
@@ -299,27 +240,23 @@ def main() -> None:
     if args.format != "human":
         validator_kwargs["serialize_report_graph"] = args.format
 
-    validate_result: Tuple[bool, Union[Exception, bytes, str, rdflib.Graph], str]
-    validate_result = pyshacl.validate(
-        data_graph,
-        shacl_graph=ontology_graph,
-        ont_graph=ontology_graph,
-        inference=args.inference,
-        meta_shacl=args.metashacl,
+    validation_result: ValidationResult = validate(
+        args.in_graph,
         abort_on_first=args.abort,
         allow_infos=True if args.allow_infos else False,
         allow_warnings=True if args.allow_warnings else False,
+        case_version=args.built_version,
         debug=True if args.debug else False,
         do_owl_imports=True if args.imports else False,
-        **validator_kwargs
+        inference=args.inference,
+        meta_shacl=args.metashacl,
+        supplemental_graphs=args.ontology_graph,
+        **validator_kwargs,
     )
 
-    # Relieve RAM of the data graph after validation has run.
-    del data_graph
-
-    conforms = validate_result[0]
-    validation_graph = validate_result[1]
-    validation_text = validate_result[2]
+    conforms = validation_result.conforms
+    validation_graph = validation_result.graph
+    validation_text = validation_result.text
 
     # NOTE: The output logistics code is adapted from pySHACL's file
     # pyshacl/cli.py.  This section should be monitored for code drift.
@@ -341,13 +278,6 @@ def main() -> None:
                 % type(validation_graph)
             )
 
-    if len(undefined_cdo_concepts) > 0:
-        warnings.warn(undefined_cdo_concepts_message)
-        if not args.allow_warnings:
-            undefined_cdo_concepts_alleviation_message = "The data graph is SHACL-conformant with the CDO ontologies, but nonexistent-concept references raise Warnings with this tool.  Please either correct the concept names in the data graph; use the --ontology-graph flag to pass a corrected CDO ontology file, also using --built-version none; or, use the --allow-warnings flag."
-            warnings.warn(undefined_cdo_concepts_alleviation_message)
-            conforms = False
-
     sys.exit(0 if conforms else 1)
 
 
diff --git a/case_utils/case_validate/validate_types.py b/case_utils/case_validate/validate_types.py
new file mode 100644
index 0000000..1625963
--- /dev/null
+++ b/case_utils/case_validate/validate_types.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+
+# Portions of this file contributed by NIST are governed by the following
+# statement:
+#
+# This software was developed at the National Institute of Standards
+# and Technology by employees of the Federal Government in the course
+# of their official duties. Pursuant to Title 17 Section 105 of the
+# United States Code, this software is not subject to copyright
+# protection within the United States. NIST assumes no responsibility
+# whatsoever for its use by other parties, and makes no guarantees,
+# expressed or implied, about its quality, reliability, or any other
+# characteristic.
+#
+# We would appreciate acknowledgement if the software is used.
+
+from typing import Set, Union
+
+import rdflib
+
+
+class ValidationResult:
+    def __init__(
+        self,
+        conforms: bool,
+        graph: Union[Exception, bytes, str, rdflib.Graph],
+        text: str,
+        undefined_concepts: Set[rdflib.URIRef],
+    ) -> None:
+        self.conforms = conforms
+        self.graph = graph
+        self.text = text
+        self.undefined_concepts = undefined_concepts
+
+
+class NonExistentCDOConceptWarning(UserWarning):
+    """
+    This class is used when a concept is encountered in the data graph that is not part of CDO ontologies, according to the --built-version flags and --ontology-graph flags.
+    """
+
+    pass
+
+
+class NonExistentCASEVersionError(Exception):
+    """
+    This class is used when an invalid CASE version is requested that is not supported by the library.
+    """
+
+    pass
diff --git a/case_utils/case_validate/validate_utils.py b/case_utils/case_validate/validate_utils.py
new file mode 100644
index 0000000..b7ed317
--- /dev/null
+++ b/case_utils/case_validate/validate_utils.py
@@ -0,0 +1,184 @@
+#!/usr/bin/env python3
+
+# Portions of this file contributed by NIST are governed by the following
+# statement:
+#
+# This software was developed at the National Institute of Standards
+# and Technology by employees of the Federal Government in the course
+# of their official duties. Pursuant to Title 17 Section 105 of the
+# United States Code, this software is not subject to copyright
+# protection within the United States. NIST assumes no responsibility
+# whatsoever for its use by other parties, and makes no guarantees,
+# expressed or implied, about its quality, reliability, or any other
+# characteristic.
+#
+# We would appreciate acknowledgement if the software is used.
+
+import importlib
+import logging
+import os
+from typing import List, Optional, Set
+
+import rdflib
+
+import case_utils
+from case_utils.case_validate.validate_types import NonExistentCASEVersionError
+from case_utils.ontology.version_info import CURRENT_CASE_VERSION
+
+NS_OWL = rdflib.OWL
+NS_RDF = rdflib.RDF
+NS_RDFS = rdflib.RDFS
+NS_SH = rdflib.SH
+
+_logger = logging.getLogger(os.path.basename(__file__))
+
+
+def concept_is_cdo_concept(n_concept: rdflib.URIRef) -> bool:
+    """
+    Determine if a concept is part of the CDO ontology.
+
+    :param n_concept: The concept to check.
+    :return: whether the concept is part of the CDO ontologies.
+    """
+    concept_iri = str(n_concept)
+    return concept_iri.startswith(
+        "https://ontology.unifiedcyberontology.org/"
+    ) or concept_iri.startswith("https://ontology.caseontology.org/")
+
+
+def get_invalid_cdo_concepts(
+    data_graph: rdflib.Graph, ontology_graph: rdflib.Graph
+) -> Set[rdflib.URIRef]:
+    """
+    Get the set of concepts in the data graph that are not part of the CDO ontologies as specified with the ontology_graph argument.
+
+    :param data_graph: The data graph to validate.
+    :param ontology_graph: The ontology graph to use for validation.
+    :return: The list of concepts in the data graph that are not part of the CDO ontology.
+
+    >>> from case_utils.namespace import NS_RDF, NS_OWL, NS_UCO_CORE
+    >>> from rdflib import Graph, Literal, Namespace, URIRef
+    >>> # Define a namespace for a knowledge base, and a namespace for custom extensions.
+    >>> ns_kb = Namespace("http://example.org/kb/")
+    >>> ns_ex = Namespace("http://example.org/ontology/")
+    >>> dg = Graph()
+    >>> og = Graph()
+    >>> # Use an ontology graph in review that includes only a single class and a single property excerpted from UCO, but also a single custom property.
+    >>> _ = og.add((NS_UCO_CORE.UcoObject, NS_RDF.type, NS_OWL.Class))
+    >>> _ = og.add((NS_UCO_CORE.name, NS_RDF.type, NS_OWL.DatatypeProperty))
+    >>> _ = og.add((ns_ex.ourCustomProperty, NS_RDF.type, NS_OWL.DatatypeProperty))
+    >>> # Define an individual.
+    >>> n_uco_object = ns_kb["UcoObject-f494d239-d9fd-48da-bc07-461ba86d8c6c"]
+    >>> n_uco_object
+    rdflib.term.URIRef('http://example.org/kb/UcoObject-f494d239-d9fd-48da-bc07-461ba86d8c6c')
+    >>> # Review a data graph that includes only the single individual, class typo'd (capitalized incorrectly), but property OK.
+    >>> _ = dg.add((n_uco_object, NS_RDF.type, NS_UCO_CORE.UCOObject))
+    >>> _ = dg.add((n_uco_object, NS_UCO_CORE.name, Literal("Test")))
+    >>> _ = dg.add((n_uco_object, ns_ex.customProperty, Literal("Custom Value")))
+    >>> invalid_cdo_concepts = get_invalid_cdo_concepts(dg, og)
+    >>> invalid_cdo_concepts
+    {rdflib.term.URIRef('https://ontology.unifiedcyberontology.org/uco/core/UCOObject')}
+    >>> # Note that the property "ourCustomProperty" was typo'd in the data graph, but this was not reported.
+    >>> assert ns_ex.ourCustomProperty not in invalid_cdo_concepts
+    """
+    # Construct set of CDO concepts for data graph concept-existence review.
+    cdo_concepts: Set[rdflib.URIRef] = set()
+
+    for n_structural_class in [
+        NS_OWL.Class,
+        NS_OWL.AnnotationProperty,
+        NS_OWL.DatatypeProperty,
+        NS_OWL.ObjectProperty,
+        NS_RDFS.Datatype,
+        NS_SH.NodeShape,
+        NS_SH.PropertyShape,
+        NS_SH.Shape,
+    ]:
+        for ontology_triple in ontology_graph.triples(
+            (None, NS_RDF.type, n_structural_class)
+        ):
+            if not isinstance(ontology_triple[0], rdflib.URIRef):
+                continue
+            if concept_is_cdo_concept(ontology_triple[0]):
+                cdo_concepts.add(ontology_triple[0])
+    for n_ontology_predicate in [
+        NS_OWL.backwardCompatibleWith,
+        NS_OWL.imports,
+        NS_OWL.incompatibleWith,
+        NS_OWL.priorVersion,
+        NS_OWL.versionIRI,
+    ]:
+        for ontology_triple in ontology_graph.triples(
+            (None, n_ontology_predicate, None)
+        ):
+            assert isinstance(ontology_triple[0], rdflib.URIRef)
+            assert isinstance(ontology_triple[2], rdflib.URIRef)
+            cdo_concepts.add(ontology_triple[0])
+            cdo_concepts.add(ontology_triple[2])
+    for ontology_triple in ontology_graph.triples((None, NS_RDF.type, NS_OWL.Ontology)):
+        if not isinstance(ontology_triple[0], rdflib.URIRef):
+            continue
+        cdo_concepts.add(ontology_triple[0])
+
+    # Also load historical ontology and version IRIs.
+    ontology_and_version_iris_data = importlib.resources.read_text(
+        case_utils.ontology, "ontology_and_version_iris.txt"
+    )
+    for line in ontology_and_version_iris_data.split("\n"):
+        cleaned_line = line.strip()
+        if cleaned_line == "":
+            continue
+        cdo_concepts.add(rdflib.URIRef(cleaned_line))
+
+    data_cdo_concepts: Set[rdflib.URIRef] = set()
+    for data_triple in data_graph.triples((None, None, None)):
+        for data_triple_member in data_triple:
+            if isinstance(data_triple_member, rdflib.URIRef):
+                if concept_is_cdo_concept(data_triple_member):
+                    data_cdo_concepts.add(data_triple_member)
+            elif isinstance(data_triple_member, rdflib.Literal):
+                if isinstance(data_triple_member.datatype, rdflib.URIRef):
+                    if concept_is_cdo_concept(data_triple_member.datatype):
+                        data_cdo_concepts.add(data_triple_member.datatype)
+
+    return data_cdo_concepts - cdo_concepts
+
+
+def get_ontology_graph(
+    case_version: Optional[str] = None, supplemental_graphs: Optional[List[str]] = None
+) -> rdflib.Graph:
+    """
+    Get the ontology graph for the given case_version and any supplemental graphs.
+
+    :param case_version: the version of the CASE ontology to use.  If None (i.e. null), the most recent version will be used.  If "none" (the string), no pre-built version of CASE will be used.
+    :param supplemental_graphs: a list of supplemental graphs to use.  If None, no supplemental graphs will be used.
+    :return: the ontology graph against which to validate the data graph.
+    """
+    ontology_graph = rdflib.Graph()
+
+    if case_version != "none":
+        # Load bundled CASE ontology at requested version.
+        if case_version is None or case_version == "":
+            case_version = CURRENT_CASE_VERSION
+        # If the first character case_version is numeric, prepend case- to it. This allows for the version to be passed
+        # by the library as both case-1.2.0 and 1.2.0
+        if case_version[0].isdigit():
+            case_version = "case-" + case_version
+        ttl_filename = case_version + ".ttl"
+        _logger.debug("ttl_filename = %r.", ttl_filename)
+        # Ensure the requested version of the CASE ontology is available and if not, throw an appropriate exception
+        # that can be returned in a user-friendly message.
+        if not importlib.resources.is_resource(case_utils.ontology, ttl_filename):
+            raise NonExistentCASEVersionError(
+                f"The requested version ({case_version}) of the CASE ontology is not available.  Please choose a "
+                f"different version. The latest supported version is: {CURRENT_CASE_VERSION}"
+            )
+        ttl_data = importlib.resources.read_text(case_utils.ontology, ttl_filename)
+        ontology_graph.parse(data=ttl_data, format="turtle")
+
+    if supplemental_graphs:
+        for arg_ontology_graph in supplemental_graphs:
+            _logger.debug("arg_ontology_graph = %r.", arg_ontology_graph)
+            ontology_graph.parse(arg_ontology_graph)
+
+    return ontology_graph
diff --git a/tests/case_utils/case_file/Makefile b/tests/case_utils/case_file/Makefile
index 91bf6d6..e2014ec 100644
--- a/tests/case_utils/case_file/Makefile
+++ b/tests/case_utils/case_file/Makefile
@@ -82,6 +82,9 @@ kb.ttl: \
 
 #TODO - kb.json has a conversion error with context dictionary construction and custom datatypes.
 kb_validation.ttl: \
+  $(top_srcdir)/case_utils/case_validate/__init__.py \
+  $(top_srcdir)/case_utils/case_validate/validate_types.py \
+  $(top_srcdir)/case_utils/case_validate/validate_utils.py \
   kb.ttl
 	source $(tests_srcdir)/venv/bin/activate \
 	  && case_validate \
diff --git a/tests/case_utils/case_validate/case_test_examples/Makefile b/tests/case_utils/case_validate/case_test_examples/Makefile
index 089c840..ff33917 100644
--- a/tests/case_utils/case_validate/case_test_examples/Makefile
+++ b/tests/case_utils/case_validate/case_test_examples/Makefile
@@ -44,6 +44,8 @@ all: \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
   $(top_srcdir)/case_utils/case_validate/__init__.py \
+  $(top_srcdir)/case_utils/case_validate/validate_types.py \
+  $(top_srcdir)/case_utils/case_validate/validate_utils.py \
   $(top_srcdir)/case_utils/ontology/__init__.py
 	rm -f __$@ _$@
 	source $(tests_srcdir)/venv/bin/activate \
diff --git a/tests/case_utils/case_validate/cli/Makefile b/tests/case_utils/case_validate/cli/Makefile
index dc78c50..5795ad4 100644
--- a/tests/case_utils/case_validate/cli/Makefile
+++ b/tests/case_utils/case_validate/cli/Makefile
@@ -23,6 +23,11 @@ tests_srcdir := $(top_srcdir)/tests
 
 RDF_TOOLKIT_JAR := $(case_srcdir)/lib/rdf-toolkit.jar
 
+case_validate_sources := \
+  $(top_srcdir)/case_utils/case_validate/__init__.py \
+  $(top_srcdir)/case_utils/case_validate/validate_types.py \
+  $(top_srcdir)/case_utils/case_validate/validate_utils.py
+
 files_to_generate := \
   errant_cdo_concept_PASS.txt \
   errant_cdo_concept_XFAIL.txt \
@@ -62,9 +67,9 @@ clean:
 	  $(files_to_generate)
 
 errant_cdo_concept_PASS.txt: \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py \
   errant_cdo_concept.ttl
 	rm -f _$@
@@ -77,9 +82,9 @@ errant_cdo_concept_PASS.txt: \
 	mv _$@ $@
 
 errant_cdo_concept_XFAIL.txt: \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py \
   errant_cdo_concept.ttl
 	rm -f _$@
@@ -94,9 +99,9 @@ errant_cdo_concept_XFAIL.txt: \
 
 format_human_output_%: \
   $(examples_srcdir)/investigative_action_PASS_validation.ttl \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py
 	rm -f _$@
 	source $(tests_srcdir)/venv/bin/activate \
@@ -109,9 +114,9 @@ format_human_output_%: \
 
 format_human_output_unspecified.txt: \
   $(examples_srcdir)/investigative_action_PASS_validation.ttl \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py
 	rm -f _$@
 	source $(tests_srcdir)/venv/bin/activate \
@@ -126,9 +131,9 @@ format_human_output_unspecified.txt: \
 # blank node ID that does not serve to inform the example.
 format_jsonld_output_%: \
   $(examples_srcdir)/investigative_action_PASS_validation.ttl \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py
 	rm -f __$@ _$@
 	source $(tests_srcdir)/venv/bin/activate \
@@ -146,9 +151,9 @@ format_jsonld_output_%: \
 
 format_jsonld_output_unspecified.jsonld: \
   $(examples_srcdir)/investigative_action_PASS_validation.ttl \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py
 	rm -f __$@ _$@
 	source $(tests_srcdir)/venv/bin/activate \
@@ -166,9 +171,9 @@ format_jsonld_output_unspecified.jsonld: \
 
 format_turtle_output_%: \
   $(examples_srcdir)/investigative_action_PASS_validation.ttl \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py
 	rm -f _$@
 	source $(tests_srcdir)/venv/bin/activate \
@@ -181,9 +186,9 @@ format_turtle_output_%: \
 
 format_turtle_output_unspecified.ttl: \
   $(examples_srcdir)/investigative_action_PASS_validation.ttl \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py
 	rm -f _$@
 	source $(tests_srcdir)/venv/bin/activate \
@@ -196,9 +201,9 @@ format_turtle_output_unspecified.ttl: \
 
 format_unspecified_output_%: \
   $(examples_srcdir)/investigative_action_PASS_validation.ttl \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py
 	rm -f _$@
 	source $(tests_srcdir)/venv/bin/activate \
@@ -210,9 +215,9 @@ format_unspecified_output_%: \
 
 format_unspecified_output_unspecified.txt: \
   $(examples_srcdir)/investigative_action_PASS_validation.ttl \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py
 	rm -f _$@
 	source $(tests_srcdir)/venv/bin/activate \
@@ -223,9 +228,9 @@ format_unspecified_output_unspecified.txt: \
 	mv _$@ $@
 
 past_version_reference_PASS.txt: \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py \
   $(top_srcdir)/case_utils/ontology/ontology_and_version_iris.txt \
   past_version_reference_PASS.ttl
@@ -237,9 +242,9 @@ past_version_reference_PASS.txt: \
 	mv _$@ $@
 
 past_version_reference_XFAIL.txt: \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py \
   $(top_srcdir)/case_utils/ontology/ontology_and_version_iris.txt \
   past_version_reference_XFAIL.ttl
@@ -253,9 +258,9 @@ past_version_reference_XFAIL.txt: \
 	mv _$@ $@
 
 split_data_graph_PASS.txt: \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py \
   split_data_graph_1.json \
   split_data_graph_2.json
@@ -269,9 +274,9 @@ split_data_graph_PASS.txt: \
 	mv _$@ $@
 
 split_data_graph_XFAIL.txt: \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py \
   split_data_graph_1.json
 	rm -f _$@
@@ -285,9 +290,9 @@ split_data_graph_XFAIL.txt: \
 	mv _$@ $@
 
 thing_metashacl_PASS.txt: \
+  $(case_validate_sources) \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
-  $(top_srcdir)/case_utils/case_validate/__init__.py \
   $(top_srcdir)/case_utils/ontology/__init__.py \
   thing.ttl
 	rm -f _$@
diff --git a/tests/case_utils/case_validate/shape_disabling/Makefile b/tests/case_utils/case_validate/shape_disabling/Makefile
index b9603ac..db3437b 100644
--- a/tests/case_utils/case_validate/shape_disabling/Makefile
+++ b/tests/case_utils/case_validate/shape_disabling/Makefile
@@ -32,6 +32,9 @@ clean:
 
 validation_with_uuid_shape_disabled.txt: \
   $(tests_srcdir)/.venv.done.log \
+  $(top_srcdir)/case_utils/case_validate/__init__.py \
+  $(top_srcdir)/case_utils/case_validate/validate_types.py \
+  $(top_srcdir)/case_utils/case_validate/validate_utils.py \
   disable_shape.ttl \
   example.ttl
 	source $(tests_srcdir)/venv/bin/activate \
@@ -43,6 +46,9 @@ validation_with_uuid_shape_disabled.txt: \
 
 validation_with_uuid_shape_enabled.txt: \
   $(tests_srcdir)/.venv.done.log \
+  $(top_srcdir)/case_utils/case_validate/__init__.py \
+  $(top_srcdir)/case_utils/case_validate/validate_types.py \
+  $(top_srcdir)/case_utils/case_validate/validate_utils.py \
   example.ttl
 	source $(tests_srcdir)/venv/bin/activate \
 	  && case_validate \
diff --git a/tests/case_utils/case_validate/uco_test_examples/Makefile b/tests/case_utils/case_validate/uco_test_examples/Makefile
index 2d4550b..921b683 100644
--- a/tests/case_utils/case_validate/uco_test_examples/Makefile
+++ b/tests/case_utils/case_validate/uco_test_examples/Makefile
@@ -76,6 +76,8 @@ all: \
   $(tests_srcdir)/.venv.done.log \
   $(top_srcdir)/.ontology.done.log \
   $(top_srcdir)/case_utils/case_validate/__init__.py \
+  $(top_srcdir)/case_utils/case_validate/validate_types.py \
+  $(top_srcdir)/case_utils/case_validate/validate_utils.py \
   $(top_srcdir)/case_utils/ontology/__init__.py
 	source $(tests_srcdir)/venv/bin/activate \
 	  && case_validate \