diff --git a/python/cic_schema/__pycache__/__init__.cpython-310.pyc b/python/cic_schema/__pycache__/__init__.cpython-310.pyc
index 6e0fc39..069c1ad 100644
Binary files a/python/cic_schema/__pycache__/__init__.cpython-310.pyc and b/python/cic_schema/__pycache__/__init__.cpython-310.pyc differ
diff --git a/python/cic_schema/__pycache__/cert.cpython-310.pyc b/python/cic_schema/__pycache__/cert.cpython-310.pyc
index ba65e93..14303e2 100644
Binary files a/python/cic_schema/__pycache__/cert.cpython-310.pyc and b/python/cic_schema/__pycache__/cert.cpython-310.pyc differ
diff --git a/python/cic_schema/cert.py b/python/cic_schema/cert.py
index e197212..102df74 100644
--- a/python/cic_schema/cert.py
+++ b/python/cic_schema/cert.py
@@ -1,17 +1,44 @@
 # standard imports
 import sys
+import enum
 
 # external imports
-from rdflib import Graph
+from rdflib import Graph, RDF
+from rdflib.term import URIRef
+from rdflib.collection import Collection
+
+
+class CIC(enum.Enum):
+    voucherContract = URIRef('https://defalsify.org/rdf-eth/0.1/voucherContract')
+    voucherTransfer = URIRef('https://defalsify.org/rdf-eth/0.1/voucherTransfer')
 
 
 class Cert:
 
-    def __init__(self, path):
+    def __init__(self):
         self.g = Graph()
-        self.g.parse(path, format='turtle')
+        self.txs = {}
+        self.typ = None
 
 
+    @classmethod
+    def from_path(cls, path):
+        c = cls()
+        c.g.parse(path, format='turtle')
+        c.__apply_graph()
+        return c
+
+
+    def __apply_graph(self):
+        current_subject = None
+        for (s, p, o) in self.g:
+            if s != current_subject: 
+                current_subject = s
+            if p == RDF.first:
+                pass
+            print('{} {} {}'.format(s, p, o))
+                
+
     def export(self, w=sys.stdout):
         v = self.g.serialize(format='xml')
         w.write(v)
diff --git a/python/tests/test_json.py b/python/tests/test_json.py
index 332c931..e4bac8f 100644
--- a/python/tests/test_json.py
+++ b/python/tests/test_json.py
@@ -4,29 +4,24 @@ import json
 import os
 
 # external imports
-from jsonschema import validate as json_validate
+#from jsonschema import validate as json_validate
+# local imports
+from cic_schema.nft import NFT
 
 test_dir = os.path.realpath(os.path.dirname(__file__))
 testdata_dir = os.path.join(test_dir, 'testdata')
-data_dir = os.path.join(test_dir, '..', 'cic_schema', 'data')
+#data_dir = os.path.join(test_dir, '..', 'cic_schema', 'data')
 
 
 class TestJsonData(unittest.TestCase):
 
     def setUp(self):
-        fp = os.path.join(data_dir, 'cic.json')
-        f = open(fp, 'r')
-        self.schema = json.load(f)
-        f.close()
+        self.path = os.path.join(testdata_dir, 'test_valid.json')
+        self.nft = NFT.from_path(self.path)
 
 
-    def test_schema_load(self):
-        fp = os.path.join(testdata_dir, 'test_valid.json')
-        f = open(fp, 'r')
-        o = json.load(f)
-        f.close()
-        validator = json_validate(o, self.schema)
-
+    def test_valid(self):
+        pass
 
 
 if __name__ == '__main__':
diff --git a/python/tests/test_nft.py b/python/tests/test_nft.py
index 790aa15..e3c7a38 100644
--- a/python/tests/test_nft.py
+++ b/python/tests/test_nft.py
@@ -19,14 +19,15 @@ data_dir = os.path.join(test_dir, '..', 'cic_schema', 'data')
 class TestNft(unittest.TestCase):
 
     def setUp(self):
-        fp = os.path.join(testdata_dir, 'test_voucher.rdf')
-        self.graph_voucher = Cert(fp)
-        fp = os.path.join(testdata_dir, 'test_tx.rdf')
-        self.graph_tx = Cert(fp)
+        #fp = os.path.join(testdata_dir, 'test_voucher.rdf')
+        #self.graph_voucher = Cert.from_path(fp)
+        fp = os.path.join(testdata_dir, 'test_tx2.rdf')
+        self.graph_tx = Cert.from_path(fp)
 
 
     def test_simplest(self):
-        print(self.graph_tx.export())
+        pass
+
 
 
 if __name__ == '__main__':
diff --git a/python/tests/testdata/test_tx.rdf b/python/tests/testdata/test_tx.rdf
index 0f32ea7..f63f2bd 100644
--- a/python/tests/testdata/test_tx.rdf
+++ b/python/tests/testdata/test_tx.rdf
@@ -1,12 +1,15 @@
-@prefix evm: <https://defalsify.org/rdf-eth/0.1/#> .
+@prefix evm: <https://defalsify.org/rdf-eth/0.1/> .
 @prefix cic: <https://cicnet.org/rdf/0.1/> .
 @prefix ge: <https://grassrootseconomics.net/rdf/0.1/ge#> .
 @prefix redcross: <https://redcross.com/cic-def/0.1/> .
-@prefix un: <https://un.com/esg/0.1/> .
+@prefix un: <https://un.com/cic/0.1/> .
 @prefix xsd:	<http://www.w3.org/2001/XMLSchema#> .
 
-evm:voucherTransfer
-	evm:id	"6f4ed36c11345a9a48353cd2f93f1f92958c96df15f3112a192bc994250e8d03"^^xsd:hexBinary ;
+(
+	"6f4ed36c11345a9a48353cd2f93f1f92958c96df15f3112a192bc994250e8d03"^^evm:id
+	"7f4ed36c11345a9a48353cd2f93f1f92958c96df15f3112a192bc994250e8d03"^^evm:id
+	"8f4ed36c11345a9a48353cd2f93f1f92958c96df15f3112a192bc994250e8d03"^^evm:id
+)
 	ge:approvedActor	<URN:uuid:18daebc7-23b9-41e4-af00-2559f7840f78> ;
 	redcross:interest	ge:foodforest ;
 	un:esg	"deforestation" ;