Add initial Version class.

lakesuperior/model/version.py

@@ -0,0 +1,26 @@
+from flask import g, current_app
+from rdflib import Graph
+
+from lakesuperior.model.ldp_nr import Ldpc
+
+
+class Version(Ldpc):
+    '''
+    A resource version.
+    '''
+
+    def __init__(self, parent_uuid, label):
+        self.uuid = parent_uuid + '/' + label
+        self.urn = nsc['fcres'][uuid]
+        self.uri = g.tbox.uuid_to_uri(self.uuid)
+
+        self.rdfly = current_app.rdfly
+
+        self.parent_urn = nsc['fcres'][parent_uuid]
+        self.label = label
+
+
+    def create(self):
+        if not self.rdfly.ask_rsrc_exists(self.parent_urn):
+            add_gr = Graph()
+            self._modify_rsrc(self.RES_CREATED, add_trp=add_gr)