diff --git a/src/edge-types/abstract-edge.ts b/src/edge-types/abstract-edge.ts
index 6b5ccdc..2c85bf1 100644
--- a/src/edge-types/abstract-edge.ts
+++ b/src/edge-types/abstract-edge.ts
@@ -1,12 +1,13 @@
 
 import { Node } from "../node-types/abstract-node";
 
-export abstract class EDGE {
+export abstract class Edge {
 
     public static readonly EDGE_TYPE: string;
     public static readonly SOURCE_TYPES: string[];
     public static readonly REFERENCE_TYPES: string[];
-  
+    public static readonly RELATIONSHIP: string;
+
     public readonly source: Node;
     public readonly reference: Node;
   
@@ -16,12 +17,14 @@ export abstract class EDGE {
     }
 
     public static nodesCompatible(source: Node, reference: Node): boolean {
-        if (!this.SOURCE_TYPES.includes(source.TYPE)) return false;
-        if (!this.REFERENCE_TYPES.includes(reference.TYPE)) return false;
+        const sourceClass = source.constructor as typeof Node;
+        const referenceClass = reference.constructor as typeof Node;
+        if (!this.SOURCE_TYPES.includes(sourceClass.TYPE)) return false;
+        if (!this.REFERENCE_TYPES.includes(referenceClass.TYPE)) return false;
         return true;
     }
   
-    public static createEdge(source: Node, reference: Node): EDGE {
+    public static createEdge(source: Node, reference: Node): Edge {
         throw new Error('You must override the static createEdge method in specific edge implementations');
     }
 
diff --git a/src/edge-types/generate.ts b/src/edge-types/generate.ts
new file mode 100644
index 0000000..0222e4f
--- /dev/null
+++ b/src/edge-types/generate.ts
@@ -0,0 +1,19 @@
+
+import { Node } from "../node-types/abstract-node";
+import { Edge } from "./abstract-edge";
+
+export class GenerateEdge extends Edge {
+
+    public static readonly EDGE_TYPE = "generate";
+    public static readonly SOURCE_TYPES = ["claim", "evidence"];
+    public static readonly REFERENCE_TYPES = ['question'];
+    public static readonly RELATIONSHIP = "generated-by";
+
+    constructor(source: Node, reference: Node) {
+        super(source, reference);
+    }
+
+    public static createEdge(source: Node, reference: Node) {
+        return new GenerateEdge(source, reference);
+    }
+}
\ No newline at end of file
diff --git a/src/edge-types/inform.ts b/src/edge-types/inform.ts
index 21ff827..71f4a1d 100644
--- a/src/edge-types/inform.ts
+++ b/src/edge-types/inform.ts
@@ -1,12 +1,13 @@
 
 import { Node } from "../node-types/abstract-node";
-import { EDGE } from "./abstract-edge";
+import { Edge } from "./abstract-edge";
 
-export class InformEdge extends EDGE {
+export class InformEdge extends Edge {
 
     public static readonly EDGE_TYPE = "inform";
     public static readonly SOURCE_TYPES = ["claim", "evidence"];
     public static readonly REFERENCE_TYPES = ['question'];
+    public static readonly RELATIONSHIP = "informed-by";
 
     constructor(source: Node, reference: Node) {
         super(source, reference);
diff --git a/src/edge-types/oppose.ts b/src/edge-types/oppose.ts
new file mode 100644
index 0000000..1dc7ad7
--- /dev/null
+++ b/src/edge-types/oppose.ts
@@ -0,0 +1,19 @@
+
+import { Node } from "../node-types/abstract-node";
+import { Edge } from "./abstract-edge";
+
+export class OpposeEdge extends Edge {
+
+    public static readonly EDGE_TYPE = "oppose";
+    public static readonly SOURCE_TYPES = ["claim", "evidence"];
+    public static readonly REFERENCE_TYPES = ['claim'];
+    public static readonly RELATIONSHIP = "opposed-by";
+
+    constructor(source: Node, reference: Node) {
+        super(source, reference);
+    }
+
+    public static createEdge(source: Node, reference: Node) {
+        return new OpposeEdge(source, reference);
+    }
+}
\ No newline at end of file
diff --git a/src/edge-types/support.ts b/src/edge-types/support.ts
new file mode 100644
index 0000000..8987362
--- /dev/null
+++ b/src/edge-types/support.ts
@@ -0,0 +1,19 @@
+
+import { Node } from "../node-types/abstract-node";
+import { Edge } from "./abstract-edge";
+
+export class SupportEdge extends Edge {
+
+    public static readonly EDGE_TYPE = "support";
+    public static readonly SOURCE_TYPES = ["claim", "evidence"];
+    public static readonly REFERENCE_TYPES = ['claim'];
+    public static readonly RELATIONSHIP = "supported-by";
+
+    constructor(source: Node, reference: Node) {
+        super(source, reference);
+    }
+
+    public static createEdge(source: Node, reference: Node) {
+        return new SupportEdge(source, reference);
+    }
+}
\ No newline at end of file