diff --git a/doc/example_rdfs/example_data/2010-04-16-ab_cutoff_300_contrast_20%.ttl b/doc/example_rdfs/example_data/2010-04-16-ab_cutoff_300_contrast_20%.ttl
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@@ -0,0 +1,516 @@
+@prefix odml: <https://g-node.org/projects/odml-rdf#> .
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix xml: <http://www.w3.org/XML/1998/namespace> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+
+odml:Hub odml:hasDocument odml:cd24b60f-1d5e-4040-9881-5e5a597baef7 .
+
+<https://g-node.org/projects/odml-rdf#04fed34b-abee-45f0-a8a9-b31c13967d02> a rdf:Bag ;
+    rdf:li " Munich",
+        "Ludwig-Maximilian University" .
+
+<https://g-node.org/projects/odml-rdf#075b5a09-a779-4b8b-bb4f-f67091a61d78> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "File" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#36fe8bf7-136e-48ce-927a-6e194248afca> .
+
+<https://g-node.org/projects/odml-rdf#09da05a7-2929-4eeb-8d9e-33f77d3d1aa3> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Software" ;
+    odml:hasValue odml:ab7572bb-854c-467e-a908-352f112ef109 .
+
+<https://g-node.org/projects/odml-rdf#0b090621-2f8d-43c5-892a-5159486d2d94> a rdf:Bag ;
+    rdf:li "Good" .
+
+<https://g-node.org/projects/odml-rdf#11a3c40e-f020-4b07-9b79-eeeb6bd7f4f5> a rdf:Bag ;
+    rdf:li "16:35:51" .
+
+<https://g-node.org/projects/odml-rdf#11e58106-dacc-47b4-b085-6fe17cdb5743> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Immobilization" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#3b60cf7f-47a6-48a5-b804-7d70bb7be167> .
+
+<https://g-node.org/projects/odml-rdf#13781424-3697-48f2-9fd2-08b51cbeb8ce> a rdf:Bag ;
+    rdf:li "136.8" .
+
+<https://g-node.org/projects/odml-rdf#17c5151a-4027-4999-b6ff-2dccca3d049c> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Mode" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#7208de4a-63dc-4de4-a655-513c61a86aaf> .
+
+<https://g-node.org/projects/odml-rdf#18cde1ad-1fe6-4105-8dea-b9b70715d573> a rdf:Bag ;
+    rdf:li "P-unit" .
+
+<https://g-node.org/projects/odml-rdf#19e58b9a-cb2b-4633-b102-2a2a96427a8a> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "LocalAnaesthesia" ;
+    odml:hasValue odml:e33108e2-72cc-4833-a1e6-e5439df682f0 .
+
+<https://g-node.org/projects/odml-rdf#1bcc15a8-6852-4cbd-8d48-187ff9e61a47> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Firing Rate1" ;
+    odml:hasUnit "Hz" ;
+    odml:hasValue odml:e9417a2c-20ac-4f0d-99ab-5de3c36ef73d .
+
+<https://g-node.org/projects/odml-rdf#1bdd38c8-be73-4cfd-9723-06beec7bbac5> a rdf:Bag ;
+    rdf:li "0.0" .
+
+<https://g-node.org/projects/odml-rdf#1d6db4ce-87f3-4e9c-b221-e76ba05b2759> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Date" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#8468c935-7ed1-42f4-a0d5-60864ea9226d> .
+
+<https://g-node.org/projects/odml-rdf#1d83e301-44c2-4014-9353-bcf658aac79c> a odml:Property ;
+    odml:hasDtype "float" ;
+    odml:hasName "UpperCutoffFrequency" ;
+    odml:hasUnit "Hz" ;
+    odml:hasValue odml:adb90936-7e05-4a7b-bff2-ebe60fa1d6ba .
+
+<https://g-node.org/projects/odml-rdf#1e191e89-fe64-4b47-aa33-fcfcd3fce4c9> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Lab" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#23146cd2-5851-46ac-81c5-8827cc305642> .
+
+<https://g-node.org/projects/odml-rdf#1f7ca003-f96e-4ed6-9bcc-5f3b5dd8913e> a rdf:Bag ;
+    rdf:li "120.0" .
+
+<https://g-node.org/projects/odml-rdf#215a068a-c45c-48d3-b74b-1e8d7b684041> a rdf:Bag ;
+    rdf:li "in vivo" .
+
+<https://g-node.org/projects/odml-rdf#2179255b-f213-439f-a0ea-25f01efa98a7> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Address" ;
+    odml:hasValue odml:ee931e48-ee0b-474d-a59a-fa89b0b69443 .
+
+<https://g-node.org/projects/odml-rdf#23146cd2-5851-46ac-81c5-8827cc305642> a rdf:Bag ;
+    rdf:li "Jan Benda" .
+
+<https://g-node.org/projects/odml-rdf#271f2645-ad61-4ece-8ca7-3b26f241f185> a rdf:Bag ;
+    rdf:li 1e+01 .
+
+<https://g-node.org/projects/odml-rdf#2a9e6f04-8d2f-4aca-b129-e77e88b023a1> a odml:Section ;
+    odml:hasName "Cell" ;
+    odml:hasProperty <https://g-node.org/projects/odml-rdf#52631c9e-ebf1-42e9-9ef6-000c4b3e2dfb>,
+        <https://g-node.org/projects/odml-rdf#63582830-51b4-43ef-aed6-d59b4181158c>,
+        <https://g-node.org/projects/odml-rdf#6d2713c3-261e-4d6b-8ed0-2d90bedf5a1e>,
+        <https://g-node.org/projects/odml-rdf#8e67f9ba-6819-4440-aecc-91b36de49056>,
+        odml:d6ca1018-ac58-4b63-a6a5-8c5ca28c7c99 ;
+    odml:hasType "Cell" .
+
+<https://g-node.org/projects/odml-rdf#2cb8e72c-7af0-4677-a712-126f20d33feb> a rdf:Bag ;
+    rdf:li "Henriette Walz" .
+
+<https://g-node.org/projects/odml-rdf#2cc180c9-c02a-4179-8ab2-bffea408df72> a odml:Section ;
+    odml:hasName "Subject" ;
+    odml:hasProperty <https://g-node.org/projects/odml-rdf#48b1550e-ebca-477c-a4c5-f43e7f9a6465>,
+        <https://g-node.org/projects/odml-rdf#6906e861-6a78-4673-8d53-a5a7ce0ea8e3>,
+        <https://g-node.org/projects/odml-rdf#710c51c4-8b7f-4290-9320-a013c5007d7c>,
+        <https://g-node.org/projects/odml-rdf#7e2ba5e3-9a53-4843-8cf3-c8e50500acc9>,
+        <https://g-node.org/projects/odml-rdf#94654728-fd46-4d0d-b028-af11c1871f6e> ;
+    odml:hasType "Subject" .
+
+<https://g-node.org/projects/odml-rdf#2e68370e-5638-45be-9a83-a8475a42e87e> a rdf:Bag ;
+    rdf:li "13.0" .
+
+<https://g-node.org/projects/odml-rdf#338de0a1-fde8-4914-b8fd-6da3fc729160> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Time" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#11a3c40e-f020-4b07-9b79-eeeb6bd7f4f5> .
+
+<https://g-node.org/projects/odml-rdf#35050ea8-f4f5-452f-a468-f0fe73cb2caa> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Folder" ;
+    odml:hasValue odml:a13e3cf0-1d76-420f-aa48-8da7278355c5 .
+
+<https://g-node.org/projects/odml-rdf#36fe8bf7-136e-48ce-927a-6e194248afca> a rdf:Bag ;
+    rdf:li "/home/efish/stimuli/whitenoise/gwn300Hz10s0.3.dat" .
+
+<https://g-node.org/projects/odml-rdf#3b60cf7f-47a6-48a5-b804-7d70bb7be167> a rdf:Bag ;
+    rdf:li "Pancuronium bromide" .
+
+<https://g-node.org/projects/odml-rdf#3fb77ff1-07da-457b-9b9a-db3c93a9099e> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "P-Value1" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#8206694d-98bc-46f3-ab7a-308de6ee05b6> .
+
+<https://g-node.org/projects/odml-rdf#41fff657-5521-4ef8-87a6-95b5ed05af71> a odml:Section ;
+    odml:hasName "Setup" ;
+    odml:hasProperty <https://g-node.org/projects/odml-rdf#1e191e89-fe64-4b47-aa33-fcfcd3fce4c9>,
+        <https://g-node.org/projects/odml-rdf#2179255b-f213-439f-a0ea-25f01efa98a7>,
+        <https://g-node.org/projects/odml-rdf#4c5bc4e6-5eb9-40d9-b3cd-a43fe3e7c754>,
+        <https://g-node.org/projects/odml-rdf#5cda3b1d-810b-4abc-b4ce-6dc56c83324e>,
+        <https://g-node.org/projects/odml-rdf#5f38827d-a00b-4041-ad5f-002568f5cd56>,
+        <https://g-node.org/projects/odml-rdf#856cf579-0a7b-42fc-95c6-7ae6eec79677>,
+        odml:a76a3bab-695f-4e68-a88c-27eae1942576,
+        odml:eb0f32a8-8d54-402a-9023-1230229216b4 ;
+    odml:hasType "Setup" .
+
+<https://g-node.org/projects/odml-rdf#42b1b6e2-143e-4da4-b200-3be6bd13562b> a rdf:Bag ;
+    rdf:li "Apteronotus albifrons" .
+
+<https://g-node.org/projects/odml-rdf#44052a1a-efb4-494f-a9d5-dec000ececbd> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "LocalAnaesthetic" ;
+    odml:hasValue odml:f1f790f6-e72f-42a8-95a8-06dc28acfc36 .
+
+<https://g-node.org/projects/odml-rdf#4620a3bf-3316-4a00-9fa0-206aaf520d4a> a odml:Section ;
+    odml:hasName "Stimulus" ;
+    odml:hasProperty <https://g-node.org/projects/odml-rdf#075b5a09-a779-4b8b-bb4f-f67091a61d78>,
+        <https://g-node.org/projects/odml-rdf#1d83e301-44c2-4014-9353-bcf658aac79c>,
+        <https://g-node.org/projects/odml-rdf#58780348-17fe-41e5-9654-4100d662d985>,
+        <https://g-node.org/projects/odml-rdf#6dc24779-4cd0-452c-8607-bb0a954a42dc>,
+        <https://g-node.org/projects/odml-rdf#808b277a-bcf9-447c-88c3-f031a11cfe0a>,
+        <https://g-node.org/projects/odml-rdf#902f9acf-f13c-4b29-ae3b-a9463e480752>,
+        odml:afbc3b09-1026-4fe3-844d-88733a725590,
+        odml:c4eb4dd6-3325-472b-84b4-616a9fca98c6,
+        odml:ca686128-b4a8-433f-8e47-011ef7cf30db,
+        odml:dd337c00-e453-4952-a3c6-eb4a5e7f8eb2 ;
+    odml:hasType "stimulus/white_noise" .
+
+<https://g-node.org/projects/odml-rdf#48b1550e-ebca-477c-a4c5-f43e7f9a6465> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Gender" ;
+    odml:hasValue odml:acb39fae-4a71-4d87-b06f-ab06991cb70c .
+
+<https://g-node.org/projects/odml-rdf#48e041ce-ae12-4ea7-acc7-34d24b679638> a rdf:Bag ;
+    rdf:li "1003.4" .
+
+<https://g-node.org/projects/odml-rdf#4abb9983-66d0-4fba-8eb8-9d534cb5c5be> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Type" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#215a068a-c45c-48d3-b74b-1e8d7b684041> .
+
+<https://g-node.org/projects/odml-rdf#4c5bc4e6-5eb9-40d9-b3cd-a43fe3e7c754> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Department" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#623ae7e5-e9c8-4f0b-97c0-3bb643a77be5> .
+
+<https://g-node.org/projects/odml-rdf#52631c9e-ebf1-42e9-9ef6-000c4b3e2dfb> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "CV" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#806a8457-997f-4ab7-a868-ff8a55166931> .
+
+<https://g-node.org/projects/odml-rdf#58780348-17fe-41e5-9654-4100d662d985> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Additional noise upper cutoff" ;
+    odml:hasUnit "Hz" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#1bdd38c8-be73-4cfd-9723-06beec7bbac5> .
+
+<https://g-node.org/projects/odml-rdf#5cda3b1d-810b-4abc-b4ce-6dc56c83324e> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Location" ;
+    odml:hasValue odml:c8e610ef-0f50-4630-8c32-f6a7d49e5f13 .
+
+<https://g-node.org/projects/odml-rdf#5d32c390-3735-4fbb-bb60-e8edb2056693> a rdf:Bag ;
+    rdf:li "20.0" .
+
+<https://g-node.org/projects/odml-rdf#5d9c35e1-884c-4741-b18e-662355f345ff> a rdf:Bag ;
+    rdf:li "Jan Benda" .
+
+<https://g-node.org/projects/odml-rdf#5f38827d-a00b-4041-ad5f-002568f5cd56> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Identifier" ;
+    odml:hasValue odml:aad9b7c9-7f6d-4a98-9ec6-bedc62edb9e0 .
+
+<https://g-node.org/projects/odml-rdf#623ae7e5-e9c8-4f0b-97c0-3bb643a77be5> a rdf:Bag ;
+    rdf:li " LMU-Munich",
+        "Department Biology II" .
+
+<https://g-node.org/projects/odml-rdf#63582830-51b4-43ef-aed6-d59b4181158c> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Baseline rate" ;
+    odml:hasUnit "Hz" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#13781424-3697-48f2-9fd2-08b51cbeb8ce> .
+
+<https://g-node.org/projects/odml-rdf#686b62e7-331d-426d-8446-554792fc0875> a rdf:Bag ;
+    rdf:li "Jan Benda" .
+
+<https://g-node.org/projects/odml-rdf#6906e861-6a78-4673-8d53-a5a7ce0ea8e3> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Transdermal amplitude" ;
+    odml:hasUnit "mV" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#9d39f328-fda0-4d20-82ea-8fd77e8ede73> .
+
+<https://g-node.org/projects/odml-rdf#6d2713c3-261e-4d6b-8ed0-2d90bedf5a1e> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "CellType" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#18cde1ad-1fe6-4105-8dea-b9b70715d573> .
+
+<https://g-node.org/projects/odml-rdf#6dc24779-4cd0-452c-8607-bb0a954a42dc> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Additional noise lower cutoff" ;
+    odml:hasUnit "Hz" ;
+    odml:hasValue odml:d59a760f-12a9-4738-87ba-c1691d86cbc3 .
+
+<https://g-node.org/projects/odml-rdf#710c51c4-8b7f-4290-9320-a013c5007d7c> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Size" ;
+    odml:hasUnit "cm" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#2e68370e-5638-45be-9a83-a8475a42e87e> .
+
+<https://g-node.org/projects/odml-rdf#7208de4a-63dc-4de4-a655-513c61a86aaf> a rdf:Bag ;
+    rdf:li "Acquisition" .
+
+<https://g-node.org/projects/odml-rdf#746714cd-e798-47f1-9615-fe9422e79545> a rdf:Bag ;
+    rdf:li "none" .
+
+<https://g-node.org/projects/odml-rdf#76899275-b442-4852-9866-5c12ac129f7e> a odml:Section ;
+    odml:hasName "Preparation" ;
+    odml:hasProperty <https://g-node.org/projects/odml-rdf#11e58106-dacc-47b4-b085-6fe17cdb5743>,
+        <https://g-node.org/projects/odml-rdf#19e58b9a-cb2b-4633-b102-2a2a96427a8a>,
+        <https://g-node.org/projects/odml-rdf#44052a1a-efb4-494f-a9d5-dec000ececbd>,
+        <https://g-node.org/projects/odml-rdf#4abb9983-66d0-4fba-8eb8-9d534cb5c5be>,
+        odml:e01a58c5-51c9-4944-94da-6ffbb587ca3c,
+        odml:ee0db711-3f22-4de5-b699-f1acfc1e3a8c,
+        odml:f76074c7-c60d-4b7c-9b62-00d9d55e8d7e ;
+    odml:hasType "Preparation" .
+
+<https://g-node.org/projects/odml-rdf#77833472-01b2-40bf-8002-27f785a2d22d> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Recording quality" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#0b090621-2f8d-43c5-892a-5159486d2d94> .
+
+<https://g-node.org/projects/odml-rdf#78166c57-3f0a-4b0e-af25-6fbc88d64ea3> a rdf:Bag ;
+    rdf:li "0.0" .
+
+<https://g-node.org/projects/odml-rdf#782bd29d-e4b0-4c14-a417-1772a4851ffd> a odml:Section ;
+    odml:hasName "Recording" ;
+    odml:hasProperty <https://g-node.org/projects/odml-rdf#09da05a7-2929-4eeb-8d9e-33f77d3d1aa3>,
+        <https://g-node.org/projects/odml-rdf#17c5151a-4027-4999-b6ff-2dccca3d049c>,
+        <https://g-node.org/projects/odml-rdf#1d6db4ce-87f3-4e9c-b221-e76ba05b2759>,
+        <https://g-node.org/projects/odml-rdf#338de0a1-fde8-4914-b8fd-6da3fc729160>,
+        <https://g-node.org/projects/odml-rdf#35050ea8-f4f5-452f-a468-f0fe73cb2caa>,
+        <https://g-node.org/projects/odml-rdf#77833472-01b2-40bf-8002-27f785a2d22d>,
+        <https://g-node.org/projects/odml-rdf#9aeede78-678c-4db8-acb5-fbd6d408b762>,
+        odml:c1747b35-e6b2-4b7f-80b9-cbead0243ce0,
+        odml:ca2f5e6b-3dd8-43b1-9741-94f00a42d8b8,
+        odml:d7b64566-73ea-43fc-9f5c-d6adb335e078,
+        odml:e9e8a0ab-7bff-43e4-9fa6-a3018c2002b4,
+        odml:eecba499-0e45-472e-8772-27b4aebabfcc ;
+    odml:hasType "Recording" .
+
+<https://g-node.org/projects/odml-rdf#7e2ba5e3-9a53-4843-8cf3-c8e50500acc9> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Species" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#42b1b6e2-143e-4da4-b200-3be6bd13562b> .
+
+<https://g-node.org/projects/odml-rdf#806a8457-997f-4ab7-a868-ff8a55166931> a rdf:Bag ;
+    rdf:li "0.202" .
+
+<https://g-node.org/projects/odml-rdf#808b277a-bcf9-447c-88c3-f031a11cfe0a> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Additional noise" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#746714cd-e798-47f1-9615-fe9422e79545> .
+
+<https://g-node.org/projects/odml-rdf#8206694d-98bc-46f3-ab7a-308de6ee05b6> a rdf:Bag ;
+    rdf:li "0.14" .
+
+<https://g-node.org/projects/odml-rdf#83526de2-d272-44d7-a5c5-c0d930d9911a> a rdf:Bag ;
+    rdf:li "true" .
+
+<https://g-node.org/projects/odml-rdf#8468c935-7ed1-42f4-a0d5-60864ea9226d> a rdf:Bag ;
+    rdf:li "2010-04-16" .
+
+<https://g-node.org/projects/odml-rdf#856cf579-0a7b-42fc-95c6-7ae6eec79677> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "University" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#04fed34b-abee-45f0-a8a9-b31c13967d02> .
+
+<https://g-node.org/projects/odml-rdf#8e67f9ba-6819-4440-aecc-91b36de49056> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Depth" ;
+    odml:hasUnit "um" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#78166c57-3f0a-4b0e-af25-6fbc88d64ea3> .
+
+<https://g-node.org/projects/odml-rdf#902f9acf-f13c-4b29-ae3b-a9463e480752> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Contrast" ;
+    odml:hasUnit "%" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#5d32c390-3735-4fbb-bb60-e8edb2056693> .
+
+<https://g-node.org/projects/odml-rdf#94654728-fd46-4d0d-b028-af11c1871f6e> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "EOD Frequency" ;
+    odml:hasUnit "Hz" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#48e041ce-ae12-4ea7-acc7-34d24b679638> .
+
+<https://g-node.org/projects/odml-rdf#98fd9c6c-3eb9-4b27-a70d-fb8d83e0bce0> a rdf:Bag ;
+    rdf:li "0.9.6 (04/12/10)" .
+
+<https://g-node.org/projects/odml-rdf#9aeede78-678c-4db8-acb5-fbd6d408b762> a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Recording duration" ;
+    odml:hasUnit "m" ;
+    odml:hasValue odml:b6665829-517c-4e1f-98bb-3440520c99ee .
+
+<https://g-node.org/projects/odml-rdf#9d39f328-fda0-4d20-82ea-8fd77e8ede73> a rdf:Bag ;
+    rdf:li "1.82" .
+
+odml:a0427b00-0c00-446d-9a8e-4cbfc4bf3189 a rdf:Bag ;
+    rdf:li "metadata.xml" .
+
+odml:a13e3cf0-1d76-420f-aa48-8da7278355c5 a rdf:Bag ;
+    rdf:li "/home/efish/relacs/plugins/efish/2010-04-16-ab" .
+
+odml:a1625c83-8dff-464e-af87-d17c1004dc7b a rdf:Bag ;
+    rdf:li "2010-04-16-ab" .
+
+odml:a76a3bab-695f-4e68-a88c-27eae1942576 a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Creator" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#686b62e7-331d-426d-8446-554792fc0875> .
+
+odml:aad9b7c9-7f6d-4a98-9ec6-bedc62edb9e0 a rdf:Bag ;
+    rdf:li "eFish-Setup" .
+
+odml:ab7572bb-854c-467e-a908-352f112ef109 a rdf:Bag ;
+    rdf:li "RELACS" .
+
+odml:acb39fae-4a71-4d87-b06f-ab06991cb70c a rdf:Bag ;
+    rdf:li "unknown" .
+
+odml:adb90936-7e05-4a7b-bff2-ebe60fa1d6ba a rdf:Bag ;
+    rdf:li 3e+02 .
+
+odml:afbc3b09-1026-4fe3-844d-88733a725590 a odml:Property ;
+    odml:hasDtype "float" ;
+    odml:hasName "Duration" ;
+    odml:hasUnit "s" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#271f2645-ad61-4ece-8ca7-3b26f241f185> .
+
+odml:b6665829-517c-4e1f-98bb-3440520c99ee a rdf:Bag ;
+    rdf:li "13.9" .
+
+odml:ba6da178-db8b-4dcb-b6d1-182bd12cf89c a odml:CellProperties ;
+    odml:hasName "Cell properties" ;
+    odml:hasProperty <https://g-node.org/projects/odml-rdf#1bcc15a8-6852-4cbd-8d48-187ff9e61a47>,
+        <https://g-node.org/projects/odml-rdf#3fb77ff1-07da-457b-9b9a-db3c93a9099e>,
+        odml:bebd5743-79d0-4a57-8b96-ad48435103e1 ;
+    odml:hasType "Cell properties" .
+
+odml:bdde80d8-a944-485c-9fd2-2c3f96f871fa a rdf:Bag ;
+    rdf:li "1007.0" .
+
+odml:bebd5743-79d0-4a57-8b96-ad48435103e1 a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "EOD Frequency" ;
+    odml:hasUnit "Hz" ;
+    odml:hasValue odml:bdde80d8-a944-485c-9fd2-2c3f96f871fa .
+
+odml:c1747b35-e6b2-4b7f-80b9-cbead0243ce0 a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Comment" ;
+    odml:hasValue odml:e6bd7a4f-2205-4197-b334-61c9d4babf6c .
+
+odml:c4eb4dd6-3325-472b-84b4-616a9fca98c6 a odml:Property ;
+    odml:hasDtype "float" ;
+    odml:hasName "StandardDeviation" ;
+    odml:hasValue odml:d44d9c3f-53e2-4676-9ab1-4341ecddc3f6 .
+
+odml:c7c6cae0-64bb-4f0d-b852-37a8dc8d8983 a rdf:Bag ;
+    rdf:li "0.0" .
+
+odml:c8e610ef-0f50-4630-8c32-f6a7d49e5f13 a rdf:Bag ;
+    rdf:li "D01-043" .
+
+odml:c9156c75-4cf9-43b8-b1d5-57780e3651a0 a rdf:Bag ;
+    rdf:li "MS 222" .
+
+odml:ca2f5e6b-3dd8-43b1-9741-94f00a42d8b8 a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Software version" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#98fd9c6c-3eb9-4b27-a70d-fb8d83e0bce0> .
+
+odml:ca686128-b4a8-433f-8e47-011ef7cf30db a odml:Property ;
+    odml:hasDtype "float" ;
+    odml:hasName "SampleRate" ;
+    odml:hasUnit "s" ;
+    odml:hasValue odml:d32e9dbf-c485-4d8d-90d6-a34ba02c9422 .
+
+odml:cd24b60f-1d5e-4040-9881-5e5a597baef7 a odml:Document ;
+    odml:hasAuthor "grewe" ;
+    odml:hasSection <https://g-node.org/projects/odml-rdf#2a9e6f04-8d2f-4aca-b129-e77e88b023a1>,
+        <https://g-node.org/projects/odml-rdf#2cc180c9-c02a-4179-8ab2-bffea408df72>,
+        <https://g-node.org/projects/odml-rdf#41fff657-5521-4ef8-87a6-95b5ed05af71>,
+        <https://g-node.org/projects/odml-rdf#4620a3bf-3316-4a00-9fa0-206aaf520d4a>,
+        <https://g-node.org/projects/odml-rdf#76899275-b442-4852-9866-5c12ac129f7e>,
+        <https://g-node.org/projects/odml-rdf#782bd29d-e4b0-4c14-a417-1772a4851ffd>,
+        odml:ba6da178-db8b-4dcb-b6d1-182bd12cf89c .
+
+odml:d32e9dbf-c485-4d8d-90d6-a34ba02c9422 a rdf:Bag ;
+    rdf:li 1e-03 .
+
+odml:d44d9c3f-53e2-4676-9ab1-4341ecddc3f6 a rdf:Bag ;
+    rdf:li 3e-01 .
+
+odml:d59a760f-12a9-4738-87ba-c1691d86cbc3 a rdf:Bag ;
+    rdf:li "0.0" .
+
+odml:d6ca1018-ac58-4b63-a6a5-8c5ca28c7c99 a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Structure" ;
+    odml:hasValue odml:fa67ea93-1640-4a2c-bc67-2915bb2955c9 .
+
+odml:d7b64566-73ea-43fc-9f5c-d6adb335e078 a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Experimenter" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#2cb8e72c-7af0-4677-a712-126f20d33feb> .
+
+odml:dd337c00-e453-4952-a3c6-eb4a5e7f8eb2 a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Additional noise contrast" ;
+    odml:hasUnit "%" ;
+    odml:hasValue odml:c7c6cae0-64bb-4f0d-b852-37a8dc8d8983 .
+
+odml:e01a58c5-51c9-4944-94da-6ffbb587ca3c a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Anaesthetic" ;
+    odml:hasValue odml:c9156c75-4cf9-43b8-b1d5-57780e3651a0 .
+
+odml:e33108e2-72cc-4833-a1e6-e5439df682f0 a rdf:Bag ;
+    rdf:li "true" .
+
+odml:e6bd7a4f-2205-4197-b334-61c9d4babf6c a rdf:Bag ;
+    rdf:li "weak response" .
+
+odml:e9417a2c-20ac-4f0d-99ab-5de3c36ef73d a rdf:Bag ;
+    rdf:li "136.0" .
+
+odml:e9e8a0ab-7bff-43e4-9fa6-a3018c2002b4 a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Name" ;
+    odml:hasValue odml:a1625c83-8dff-464e-af87-d17c1004dc7b .
+
+odml:eb0f32a8-8d54-402a-9023-1230229216b4 a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Maintainer" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#5d9c35e1-884c-4741-b18e-662355f345ff> .
+
+odml:ee0db711-3f22-4de5-b699-f1acfc1e3a8c a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "AnaestheticDose" ;
+    odml:hasUnit "mg" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#1f7ca003-f96e-4ed6-9bcc-5f3b5dd8913e> .
+
+odml:ee931e48-ee0b-474d-a59a-fa89b0b69443 a rdf:Bag ;
+    rdf:li " 82152 Planegg-Martinsried",
+        " Germany",
+        "Grosshaderner Str. 2" .
+
+odml:eecba499-0e45-472e-8772-27b4aebabfcc a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "File" ;
+    odml:hasValue odml:a0427b00-0c00-446d-9a8e-4cbfc4bf3189 .
+
+odml:f1f790f6-e72f-42a8-95a8-06dc28acfc36 a rdf:Bag ;
+    rdf:li "Lidocaine" .
+
+odml:f76074c7-c60d-4b7c-9b62-00d9d55e8d7e a odml:Property ;
+    odml:hasDtype "string" ;
+    odml:hasName "Anaesthesia" ;
+    odml:hasValue <https://g-node.org/projects/odml-rdf#83526de2-d272-44d7-a5c5-c0d930d9911a> .
+
+odml:fa67ea93-1640-4a2c-bc67-2915bb2955c9 a rdf:Bag ;
+    rdf:li "Nerve" .
+
diff --git a/doc/example_rdfs/sparql_example_queries.py b/doc/example_rdfs/sparql_example_queries.py
new file mode 100644
index 00000000..5c37b256
--- /dev/null
+++ b/doc/example_rdfs/sparql_example_queries.py
@@ -0,0 +1,86 @@
+from rdflib import Graph, Namespace, RDF
+from rdflib.plugins.sparql import prepareQuery
+
+resource = "./python-odml/doc/example_rdfs/example_data/2010-04-16-ab_cutoff_300_contrast_20%.ttl"
+
+g = Graph()
+g.parse(resource, format='turtle')
+# select d.* from dataset d, stimulus s where s.contrast = '20%'
+q1 = prepareQuery("""SELECT *
+            WHERE {
+               ?d rdf:type odml:Document .
+               ?d odml:hasSection ?s .
+               ?s rdf:type odml:Section .
+               ?s odml:hasName "Stimulus" .
+               ?s odml:hasProperty ?p .
+               ?p odml:hasName "Contrast" .
+               ?p odml:hasValue ?v .
+               ?p odml:hasUnit "%" .
+               ?v rdf:type rdf:Bag .
+               ?v rdf:li "20.0" .
+            }""", initNs={"odml": Namespace("https://g-node.org/projects/odml-rdf#"),
+                          "rdf": RDF})
+
+g = Graph()
+g.parse(resource, format='turtle')
+# select d.* from dataset d, stimulus s, cell c where s.contrast = '20%' and c.celltype='P-unit'
+q2 = prepareQuery("""SELECT *
+                WHERE {
+                   ?d rdf:type odml:Document .
+                   ?d odml:hasSection ?s .
+                   ?s rdf:type odml:Section .
+                   ?s odml:hasName "Stimulus" .
+                   ?s odml:hasProperty ?p .
+
+                   ?p odml:hasName "Contrast" .
+                   ?p odml:hasValue ?v .
+                   ?p odml:hasUnit "%" .    
+                   ?v rdf:type rdf:Bag .
+                   ?v rdf:li "20.0" .
+
+
+                   ?d odml:hasSection ?s1 .
+                   ?s1 odml:hasName "Cell" .
+                   ?s1 odml:hasProperty ?p1 .   
+
+                   ?p1 odml:hasName "CellType" .
+                   ?p1 odml:hasValue ?v1 .   
+                   ?v1 rdf:li "P-unit" .                      
+                }""", initNs={"odml": Namespace("https://g-node.org/projects/odml-rdf#"),
+                              "rdf": RDF})
+
+# select d.* from dataset d, CellProperties s, EOD Frequency c where c.unit = 'Hz'
+g = Graph()
+g.parse(resource, format='turtle')
+q3 = prepareQuery("""SELECT *
+                WHERE {
+                   ?d rdf:type odml:Document .
+                   ?d odml:hasSection ?s .
+                   ?s rdf:type odml:CellProperties .
+                   ?s odml:hasProperty ?p .
+
+                   ?p odml:hasName "EOD Frequency" .
+                   ?p odml:hasValue ?v .
+                   ?p odml:hasUnit "Hz" .    
+                   ?v rdf:type rdf:Bag .
+                   ?v rdf:li ?value .                      
+                }""", initNs={"odml": Namespace("https://g-node.org/projects/odml-rdf#"),
+                              "rdf": RDF})
+
+print("q1")
+for row in g.query(q1):
+    print("Doc: {0}, Sec: {1}, \n"
+          "Prop: {2}, Bag: {3}".format(row.d, row.s, row.p, row.v))
+
+print("q2")
+for row in g.query(q2):
+    print("Doc: {0}, Sec: {1}, \n"
+          "Prop: {2}, Bag: {3}".format(row.d, row.s, row.p, row.v))
+    print("Doc: {0}, Sec: {1}, \n"
+          "Prop: {2}, Bag: {3}".format(row.d, row.s1, row.p1, row.v1))
+
+print("q3")
+for row in g.query(q3):
+    print("Doc: {0}, Sec: {1}, \n"
+          "Prop: {2}, Bag: {3} \n"
+          "Value: {4}".format(row.d, row.s, row.p, row.v, row.value))