diff --git a/package-lock.json b/package-lock.json
index e3ff8bbe..337cc8bb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,6 +17,7 @@
         "@babel/core": "^7.16.0",
         "@babel/preset-env": "^7.16.0",
         "@babel/register": "^7.16.0",
+        "@rdfjs/data-model": "^1",
         "arrayify-stream": "^1.0.0",
         "browserify": "^17.0.0",
         "chai": "^4.0.2",
@@ -27,6 +28,7 @@
         "mocha": "^8.0.0",
         "nyc": "^14.1.1",
         "pre-commit": "^1.2.2",
+        "rdf-isomorphic": "^1.3.1",
         "rdf-test-suite": "^1.19.2",
         "streamify-string": "^1.0.1",
         "uglify-js": "^3.14.3"
@@ -1734,6 +1736,18 @@
       "dev": true,
       "optional": true
     },
+    "node_modules/@rdfjs/data-model": {
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/@rdfjs/data-model/-/data-model-1.3.4.tgz",
+      "integrity": "sha512-iKzNcKvJotgbFDdti7GTQDCYmL7GsGldkYStiP0K8EYtN7deJu5t7U11rKTz+nR7RtesUggT+lriZ7BakFv8QQ==",
+      "dev": true,
+      "dependencies": {
+        "@rdfjs/types": ">=1.0.1"
+      },
+      "bin": {
+        "rdfjs-data-model-test": "bin/test.js"
+      }
+    },
     "node_modules/@rdfjs/types": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@rdfjs/types/-/types-1.0.1.tgz",
@@ -6314,9 +6328,9 @@
       }
     },
     "node_modules/rdf-isomorphic": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/rdf-isomorphic/-/rdf-isomorphic-1.3.0.tgz",
-      "integrity": "sha512-3BRwUwCNHHR8//bqmVH+knTFVbVfkp7CWyQk7qPHHA8JriXBYxrab21OomjJx/2KF21w8bWz344mgNYEaQABYQ==",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/rdf-isomorphic/-/rdf-isomorphic-1.3.1.tgz",
+      "integrity": "sha512-6uIhsXTVp2AtO6f41PdnRV5xZsa0zVZQDTBdn0br+DZuFf5M/YD+T6m8hKDUnALI6nFL/IujTMLgEs20MlNidQ==",
       "dev": true,
       "dependencies": {
         "@rdfjs/types": "*",
@@ -9382,6 +9396,15 @@
       "dev": true,
       "optional": true
     },
+    "@rdfjs/data-model": {
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/@rdfjs/data-model/-/data-model-1.3.4.tgz",
+      "integrity": "sha512-iKzNcKvJotgbFDdti7GTQDCYmL7GsGldkYStiP0K8EYtN7deJu5t7U11rKTz+nR7RtesUggT+lriZ7BakFv8QQ==",
+      "dev": true,
+      "requires": {
+        "@rdfjs/types": ">=1.0.1"
+      }
+    },
     "@rdfjs/types": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@rdfjs/types/-/types-1.0.1.tgz",
@@ -13037,9 +13060,9 @@
       }
     },
     "rdf-isomorphic": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/rdf-isomorphic/-/rdf-isomorphic-1.3.0.tgz",
-      "integrity": "sha512-3BRwUwCNHHR8//bqmVH+knTFVbVfkp7CWyQk7qPHHA8JriXBYxrab21OomjJx/2KF21w8bWz344mgNYEaQABYQ==",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/rdf-isomorphic/-/rdf-isomorphic-1.3.1.tgz",
+      "integrity": "sha512-6uIhsXTVp2AtO6f41PdnRV5xZsa0zVZQDTBdn0br+DZuFf5M/YD+T6m8hKDUnALI6nFL/IujTMLgEs20MlNidQ==",
       "dev": true,
       "requires": {
         "@rdfjs/types": "*",
diff --git a/package.json b/package.json
index 50cb7554..155df82e 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "@babel/core": "^7.16.0",
     "@babel/preset-env": "^7.16.0",
     "@babel/register": "^7.16.0",
+    "@rdfjs/data-model": "^1",
     "arrayify-stream": "^1.0.0",
     "browserify": "^17.0.0",
     "chai": "^4.0.2",
@@ -42,6 +43,7 @@
     "mocha": "^8.0.0",
     "nyc": "^14.1.1",
     "pre-commit": "^1.2.2",
+    "rdf-isomorphic": "^1.3.1",
     "rdf-test-suite": "^1.19.2",
     "streamify-string": "^1.0.1",
     "uglify-js": "^3.14.3"
diff --git a/src/N3Parser.js b/src/N3Parser.js
index 1a7d7449..ea632932 100644
--- a/src/N3Parser.js
+++ b/src/N3Parser.js
@@ -86,7 +86,7 @@ export default class N3Parser {
       this._inversePredicate = false;
       // In N3, blank nodes are scoped to a formula
       // (using a dot as separator, as a blank node label cannot start with it)
-      this._prefixes._ = (this._graph ? `${this._graph.id.substr(2)}.` : '.');
+      this._prefixes._ = (this._graph ? `${this._graph.value}.` : '.');
       // Quantifiers are scoped to a formula
       this._quantified = Object.create(this._quantified);
     }
diff --git a/test/N3Parser-test.js b/test/N3Parser-test.js
index 80cb2466..a08c1327 100644
--- a/test/N3Parser-test.js
+++ b/test/N3Parser-test.js
@@ -1,4 +1,6 @@
-import { Parser, NamedNode, BlankNode, Quad, termFromId } from '../src/';
+import rdfDataModel from '@rdfjs/data-model';
+import { isomorphic } from 'rdf-isomorphic';
+import { Parser, NamedNode, BlankNode, Quad, termFromId, DataFactory as DF } from '../src/';
 
 const BASE_IRI = 'http://example.org/';
 
@@ -1872,6 +1874,83 @@ describe('Parser', () => {
     });
   });
 
+  describe('A parser instance with external data factory', () => {
+    it('should parse', () => {
+      const parser = new Parser({
+        baseIRI: BASE_IRI,
+        format: 'n3',
+        factory: rdfDataModel,
+      });
+      const quads = parser.parse(`
+        @prefix : <http://example.com/> .
+        { :weather a :Raining } => { :weather a :Cloudy } .
+      `);
+
+      quads.length.should.be.gt(0);
+
+      const g1 = DF.blankNode();
+      const g2 = DF.blankNode();
+
+      isomorphic(quads, [
+        DF.quad(
+          DF.namedNode('http://example.com/weather'),
+          DF.namedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
+          DF.namedNode('http://example.com/Raining'),
+          g1
+        ),
+        DF.quad(
+          DF.namedNode('http://example.com/weather'),
+          DF.namedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
+          DF.namedNode('http://example.com/Cloudy'),
+          g2
+        ),
+        DF.quad(
+          g1,
+          DF.namedNode('http://www.w3.org/2000/10/swap/log#implies'),
+          g2
+        ),
+      ]).should.be.true;
+    });
+  });
+
+  describe('A turtle parser instance with external data factory', () => {
+    it('should parse', () => {
+      const parser = new Parser({
+        baseIRI: BASE_IRI,
+        format: 'turtle',
+        factory: rdfDataModel,
+      });
+      const quads = parser.parse(`
+        @prefix : <http://example.com/> .
+        :weather a :Raining .
+
+        :jeswr :knows [
+          :name "Thomas" ;
+        ] .
+      `);
+
+      const bnode = DF.blankNode();
+
+      isomorphic(quads, [
+        DF.quad(
+          DF.namedNode('http://example.com/weather'),
+          DF.namedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'),
+          DF.namedNode('http://example.com/Raining')
+        ),
+        DF.quad(
+          DF.namedNode('http://example.com/jeswr'),
+          DF.namedNode('http://example.com/knows'),
+          bnode
+        ),
+        DF.quad(
+          bnode,
+          DF.namedNode('http://example.com/name'),
+          DF.literal('Thomas')
+        ),
+      ]).should.be.true;
+    });
+  });
+
   describe('IRI resolution', () => {
     describe('RFC3986 normal examples', () => {
       itShouldResolve('http://a/bb/ccc/d;p?q', 'g:h',     'g:h');