diff --git a/sparql_file/__init__.py b/sparql_file/__init__.py
index 924287a..0f52e1f 100644
--- a/sparql_file/__init__.py
+++ b/sparql_file/__init__.py
@@ -1,4 +1,4 @@
-from rdflib import Graph
+from rdflib import Dataset
 from rdflib_endpoint import SparqlEndpoint
 
 DEFAULT_EXAMPLE_QUERY = "select * { ?s ?p ?o } limit 10"
@@ -9,16 +9,16 @@ def sparql_file(
     example_query: str | None = None,
     graph_format: str | None = None,
 ):
-    g = Graph()
+    ds = Dataset()
 
     if example_query is None:
         example_query = DEFAULT_EXAMPLE_QUERY
 
     with open(graph_file, "r") as graph_file_io:
-        g.parse(source=graph_file_io, format=None)
+        ds.parse(source=graph_file_io, format=graph_format)
 
     # Return the SPARQL endpoint based on the RDFLib Graph
     return SparqlEndpoint(
-        graph=g,
+        graph=ds,
         example_query=example_query,
     )
diff --git a/sparql_file/cli.py b/sparql_file/cli.py
index 384e001..19e9589 100644
--- a/sparql_file/cli.py
+++ b/sparql_file/cli.py
@@ -19,7 +19,7 @@ def cli(
     If you want to bind to every address on the IPv4 and IPv6 stack set --host ''
     (cf. https://chaos.social/@white_gecko/114184354432052312)
     """
-    endpoint = sparql_file(graph_file, example_query)
+    endpoint = sparql_file(graph_file, example_query, graph_format)
     uvicorn.run(endpoint, host=host, port=port)
 
 
diff --git a/sparql_file/env.py b/sparql_file/env.py
index 313b809..adacb94 100644
--- a/sparql_file/env.py
+++ b/sparql_file/env.py
@@ -4,5 +4,6 @@
 
 GRAPH_FILE = os.getenv("GRAPH_FILE", "graph.ttl")
 EXAMPLE_QUERY = os.getenv("EXAMPLE_QUERY")
+GRAPH_FORMAT = os.getenv("GRAPH_FORMAT")
 
-app = sparql_file(GRAPH_FILE, EXAMPLE_QUERY)
+app = sparql_file(GRAPH_FILE, EXAMPLE_QUERY, GRAPH_FORMAT)
diff --git a/tests/data/example_dataset.trig b/tests/data/example_dataset.trig
new file mode 100644
index 0000000..d624dfe
--- /dev/null
+++ b/tests/data/example_dataset.trig
@@ -0,0 +1,105 @@
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+@prefix fam: <https://vocab.example.org/family#> .
+@prefix sim: <https://simpsons.example.org/> .
+
+sim:TheSimpsons {
+
+    #The Simpson
+    sim:TheSimpsons rdf:type fam:Family ;
+                    fam:hasFamilyMember sim:Homer ,
+                                        sim:Marge ,
+                                        sim:Bart ,
+                                        sim:Lisa ,
+                                        sim:Maggie .
+
+    #Homer
+    sim:Homer rdf:type foaf:Person .
+    sim:Homer foaf:name "Homer Simpson" .
+    sim:Homer foaf:age "36"^^xsd:int .
+
+    #Marge
+    sim:Marge rdf:type foaf:Person ;
+            foaf:name "Marge Simpson" ;
+            foaf:age "34"^^xsd:int .
+
+    #Bart
+    sim:Bart rdf:type foaf:Person ;
+            foaf:name "Bart Simpson" ;
+            foaf:age "10"^^xsd:int .
+
+    #Lisa
+    sim:Lisa rdf:type foaf:Person ;
+            foaf:name "Lisa Simpson" ;
+            foaf:age "8"^^xsd:int .
+
+    #Maggie
+    sim:Maggie rdf:type foaf:Person ;
+            foaf:name "Maggie Simpson" ;
+            foaf:age "1"^^xsd:int .
+}
+
+sim:Relatives {
+    #Grandparents
+    sim:Abraham rdf:type foaf:Person ;
+        foaf:name "Abraham Simpson".
+    sim:Mona rdf:type foaf:Person .
+
+    #Aunts and Uncles
+    sim:Patty rdf:type foaf:Person .
+    sim:Selma rdf:type foaf:Person .
+    sim:Herb rdf:type foaf:Person .
+
+    sim:Patty fam:hasSister sim:Selma .
+    sim:Selma fam:hasSister sim:Patty .
+
+}
+
+sim:OtherPeople {
+    sim:Moe rdf:type foaf:Person ;
+        foaf:name "Moe Szyslak";
+        foaf:age "50".
+}
+
+#Family relationships
+sim:Homer fam:hasSpouse sim:Marge .
+sim:Marge fam:hasSpouse sim:Homer .
+
+sim:Bart fam:hasFather sim:Homer ;
+         fam:hasMother sim:Marge ;
+         fam:hasSister sim:Lisa ;
+         fam:hasSister sim:Maggie .
+
+sim:Lisa fam:hasFather sim:Homer ;
+         fam:hasMother sim:Marge ;
+         fam:hasBrother sim:Bart ;
+         fam:hasSister sim:Maggie .
+
+sim:Maggie fam:hasFather sim:Homer ;
+           fam:hasMother sim:Marge ;
+           fam:hasBrother sim:Bart ;
+           fam:hasSister sim:Lisa .
+
+#Maggies Grandparents
+sim:Maggie fam:hasParent [
+    fam:hasFather sim:Abraham
+] .
+
+sim:Maggie fam:hasParent [
+    fam:hasMother sim:Mona
+] .
+
+#Lisas Aunts and Uncles
+sim:Lisa fam:hasParent [
+    fam:hasSister sim:Selma ;
+    fam:hasSister sim:Patty
+] .
+
+sim:Lisa fam:hasParent [
+    fam:hasBrother sim:Herb
+] .
+
+#Marge father in law
+sim:Homer fam:hasFather sim:Abraham .
diff --git a/tests/test_api.py b/tests/test_api.py
index 0da798a..fa8b4b9 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -13,3 +13,9 @@ def test_api_with_turtle_graph_specify_format(tmp_path):
     p = tmp_path / "graph_file.ttl"
     copy_file(simpsons.graph_file, p)
     sparql_file(p, graph_format="turtle")
+
+
+def test_api_with_trig_graph_specify_format(tmp_path):
+    p = tmp_path / "dataset.trig"
+    copy_file("tests/data/example_dataset.trig", p)
+    sparql_file(p, graph_format="trig")
\ No newline at end of file