diff --git a/src/index.js b/src/index.js
index 21b8b8e..c434f86 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,11 +1,5 @@
-//const xml = require('xml-js');
 const placing = require('./placing');
-let list = {};
-try {
-  list = require('../svg_list.json');
-} catch (err) {
-  console.error('fa-diagrams: SVG list could not be loaded', err);
-}
+const rendering = require('./rendering');
 
 /**
  * Merge resources by reading object keys and keeping reference value only if it's type is different from the source
@@ -30,11 +24,8 @@ const merge = (ref, src) => {
 };
 
 const DEFAULT_OPTIONS = {
-  'placing': {
-    'max-link-length': 2,
-    'diagonals': true,
-  },
-  'rendering': {}
+  'placing': placing().defaultOptions,
+  'rendering': rendering().defaultOptions
 };
 
 
@@ -57,8 +48,7 @@ const self = {
     if (!nodes)
       throw 'Failed to place nodes';
 
-    //console.log(JSON.stringify(nodes, null, 2));
-    console.log(Object.values(nodes).map(n => `${n.name} : [${n.x}, ${n.y}]`).join('\n'));
+    return rendering(options['rendering']).compute(nodes, links);
   },
 
 };
diff --git a/src/placing.js b/src/placing.js
index 3c8d6ea..e878038 100644
--- a/src/placing.js
+++ b/src/placing.js
@@ -16,8 +16,15 @@ const newmap = (w, h, fill) => new Array(w).fill(0).map(() => new Array(h).fill(
  * @property {string|undefined} direction
  */
 
-module.exports = (options) => {
+const DEFAULT_OPTIONS = {
+  'max-link-length': 2,
+  'diagonals': true,
+};
+
+module.exports = (options = DEFAULT_OPTIONS) => {
+
   const self = {
+    defaultOptions: DEFAULT_OPTIONS,
 
     /**
      * Get the current bounds of the graph of nodes
diff --git a/src/rendering.js b/src/rendering.js
new file mode 100644
index 0000000..fcc7acc
--- /dev/null
+++ b/src/rendering.js
@@ -0,0 +1,49 @@
+const convert = require('xml-js');
+
+let list = {};
+try {
+  list = require('../svg_list.json');
+} catch (err) {
+  console.error('fa-diagrams: SVG list could not be loaded', err);
+}
+
+const DEFAULT_OPTIONS = {
+  'beautify': false
+};
+
+module.exports = (options = DEFAULT_OPTIONS) => {
+  const self = {
+    defaultOptions: DEFAULT_OPTIONS,
+
+    /**
+     * Convert xml-js data into correct svg xml string
+     * @param {Object} data
+     * @param {number} width
+     * @param {number} height
+     * @returns {string}
+     */
+    toXML: (data, width, height) => {
+      const xml = {
+        'svg': {
+          '_attributes': {
+            'xmlns': 'http://www.w3.org/2000/svg',
+            'viewBox': `0 0 ${width} ${height}`
+          }
+        }
+      };
+      Object.keys(data).forEach(key => {
+        xml['svg'][key] = data[key];
+      });
+      return convert.js2xml(xml, {
+        compact: true,
+        spaces: options['beautify'] ? '\t' : 0
+      });
+    },
+
+    compute: () => {
+      return self.toXML({}, 0, 0); //TODO temporary
+    }
+  };
+
+  return self;
+};
\ No newline at end of file
diff --git a/test/rendering.test.js b/test/rendering.test.js
new file mode 100644
index 0000000..663a1a9
--- /dev/null
+++ b/test/rendering.test.js
@@ -0,0 +1,28 @@
+/* jshint -W117 */
+const rendering = require('../src/rendering');
+
+describe('toXML', () => {
+  test('no data', () => {
+    const res = rendering({beautify: false}).toXML({}, 0, 0);
+    expect(res).toEqual('<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 0 0"/>');
+  });
+  test('sample svg data', () => {
+    const res = rendering({beautify: false}).toXML({
+      'circle': {
+        '_attributes': {
+          'cx': 50,
+          'cy': 50,
+          'r': 50
+        }
+      }
+    }, 100, 100);
+    expect(res).toEqual('<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="50"/></svg>');
+  });
+});
+
+describe('compute', () => {
+  test('no nodes no links', () => {
+    const res = rendering({beautify: true}).compute({}, []);
+    expect(res).toEqual('<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 0 0"/>');
+  });
+});
\ No newline at end of file