diff --git a/spec/models/cfi_generator_spec.js b/spec/models/cfi_generator_spec.js
index 736aa1b..cd3614d 100644
--- a/spec/models/cfi_generator_spec.js
+++ b/spec/models/cfi_generator_spec.js
@@ -19,7 +19,7 @@ describe("CFI GENERATOR", function () {
                 +     "</div>"
                 +     "<div></div>"
                 + "</html>";
-            var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+            var $dom = $(XmlParse.fromString(dom));
 
             var commonAncestor = $($dom.children()[0]).children()[1];
             var $startElement = $($('#startParent', $dom).contents()[0]);
@@ -63,7 +63,7 @@ describe("CFI GENERATOR", function () {
                 +     "</div>"
                 +     "<div></div>"
                 + "</html>";
-            var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+            var $dom = $(XmlParse.fromString(dom));
 
             var $startElement1 = $($('#startParent', $dom).contents()[0]);
             var $startElement2 = $($('#startParent', $dom).contents()[1]);
@@ -86,7 +86,7 @@ describe("CFI GENERATOR", function () {
                 +     "</div>"
                 +     "<div></div>"
                 + "</html>";
-            var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+            var $dom = $(XmlParse.fromString(dom));
 
             var $startElement1 = $($('#startParent', $dom).contents()[1]);
             var $startElement2 = $($('#startParent', $dom).contents()[2]);
@@ -109,7 +109,7 @@ describe("CFI GENERATOR", function () {
               +     "</div>"
               +     "<div></div>"
               + "</html>";
-          var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+          var $dom = $(XmlParse.fromString(dom));
 
           var $startElement1 = $($('#startElement', $dom).contents()[0]);
           var $startElement2 = $($('#startParent', $dom).contents()[2]);
@@ -132,7 +132,7 @@ describe("CFI GENERATOR", function () {
                 +     "</div>"
                 +     "<div id='end'></div>"
                 + "</html>";
-            var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+            var $dom = $(XmlParse.fromString(dom));
 
             var $startElement1 = $($('#startParent', $dom).contents()[0]);
             var $startElement2 = $($('#end', $dom)[0]);
@@ -157,7 +157,7 @@ describe("CFI GENERATOR", function () {
                 +     "</div>"
                 +     "<div></div>"
                 + "</html>";
-            var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+            var $dom = $(XmlParse.fromString(dom));
 
             var $startElement1 = $($('#startParent', $dom).children()[0]);
             var $startElement2 = $($('#startParent', $dom).children()[2]);
@@ -183,7 +183,7 @@ describe("CFI GENERATOR", function () {
                 +     "</div>"
                 +     "<div></div>"
                 + "</html>";
-            var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+            var $dom = $(XmlParse.fromString(dom));
 
             var $startElement1 = $($('#startParent', $dom).children()[0]);
             var $startElement2 = $($('#startParent', $dom).children()[2]);
@@ -208,7 +208,7 @@ describe("CFI GENERATOR", function () {
                 +     "</div>"
                 +     "<div></div>"
                 + "</html>";
-            var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+            var $dom = $(XmlParse.fromString(dom));
 
             var $startElement1 = $($('#startParent', $dom).children()[0]);
             var $startElement2 = $($('#startParent', $dom).children()[0]);
@@ -299,7 +299,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).children()[0].firstChild);
                 var $endElement = $($('#startParent', $dom).children()[2].firstChild);
@@ -329,7 +329,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).children()[0].firstChild);
                 var $endElement = $($('#startParent', $dom).children()[0].firstChild);
@@ -357,7 +357,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).contents()[0]);
                 var $endElement = $($('#startParent', $dom).children()[0].firstChild);
@@ -382,7 +382,7 @@ describe("CFI GENERATOR", function () {
                     "    </body>" +
                     "</html>";
 
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
                 // per the issue The CFI for "important text" should be : /2/4, /2/1:5, /3:5
                 var $startElement = $($("strong", $dom).contents()[0]); // "very important"
                 var $endElement = $($("p", $dom).contents()[2]); // " text"
@@ -415,7 +415,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).contents()[1]);
                 var $endElement = $($('#startParent', $dom).contents()[5]);
@@ -443,7 +443,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).contents()[0]);
                 var $endElement = $($('#startParent', $dom).contents()[2]);
@@ -470,7 +470,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).contents()[1]);
                 var $endElement = $($('#startParent', $dom).contents()[1]);
@@ -497,7 +497,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).contents()[0]);
                 var $endElement = $($('#startParent', $dom).contents()[2]);
@@ -523,7 +523,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).contents()[1]);
                 var $endElement = $($('#startParent', $dom).contents()[1]);
@@ -548,7 +548,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).contents()[0]);
                 var $endElement = $($('#startParent', $dom).contents()[0])
@@ -606,7 +606,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).contents()[1]);
                 var $endElement = $($('#startParent', $dom).contents()[3]);
@@ -636,7 +636,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).contents()[4]);
                 var $endElement = $($('#startParent', $dom).contents()[4])
@@ -668,7 +668,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
 
                 var $startElement = $($('#startParent', $dom).contents()[4]);
                 var $endElement = $($('#startParent', $dom).contents()[4])
@@ -696,7 +696,7 @@ describe("CFI GENERATOR", function () {
                     +     "</div>"
                     +     "<div></div>"
                     + "</html>";
-                var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+                var $dom = $(XmlParse.fromString(dom));
                 var $startElement = $($('#startParent', $dom).contents()[4]);
                 var $endElement = $($('#startParent', $dom).contents()[4])
                 var generatedCFI = EPUBcfi.Generator.generateCharOffsetRangeComponent(
@@ -733,7 +733,7 @@ describe("CFI GENERATOR", function () {
                 +     "</div>"
                 +     "<div></div>"
                 + "</html>";
-            var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+            var $dom = $(XmlParse.fromString(dom));
 
             var generatedCFI = EPUBcfi.Generator.createCFIElementSteps($($('#startParent', $dom).contents()[0]), "html");
             expect(generatedCFI).toEqual("/4/2[startParent]/2");
@@ -778,7 +778,7 @@ describe("CFI GENERATOR", function () {
                 +     "</div>"
                 +     "<div></div>"
                 + "</html>";
-            var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));
+            var $dom = $(XmlParse.fromString(dom));
             var $startNode = $($('#startParent', $dom).contents()[5]);
             var textTerminus = EPUBcfi.Generator.createCFITextNodeStep($startNode, 3, ["cfi-marker"]);
             var generatedCFI = EPUBcfi.Generator.createCFIElementSteps($startNode.parent(), "html", ["cfi-marker"]) + textTerminus;
@@ -801,7 +801,7 @@ describe("CFI GENERATOR", function () {
             +   "</div>"
             + "</package>";
 
-            var packageDoc = (new window.DOMParser).parseFromString(packageDocXhtml, "text/xml");
+            var packageDoc = XmlParse.fromString(packageDocXhtml);
             var packageDocCFIComponent = EPUBcfi.Generator.generatePackageDocumentCFIComponentWithSpineIndex(2, packageDoc);
             expect(packageDocCFIComponent).toEqual("/6/2/6!"); // [ te,xtn]
         });
@@ -894,8 +894,8 @@ describe("CFI GENERATOR", function () {
             +   "<div></div>"
             + "</html>";
 
-            var contentDoc = (new window.DOMParser).parseFromString(contentDocXhtml, "text/xml");
-            var packageDoc = (new window.DOMParser).parseFromString(packageDocXhtml, "text/xml");
+            var contentDoc = XmlParse.fromString(contentDocXhtml);
+            var packageDoc = XmlParse.fromString(packageDocXhtml);
 
             var contentDocCFIComponent = EPUBcfi.Generator.generateCharacterOffsetCFIComponent($('#startParent', contentDoc).contents()[1], 3);
             var packageDocCFIComponent = EPUBcfi.Generator.generatePackageDocumentCFIComponent("contentDocId", packageDoc);
@@ -907,9 +907,9 @@ describe("CFI GENERATOR", function () {
         it('can generate a CFI for an actual epub', function () {
 
             var contentDocXhtml = jasmine.getFixtures().read("moby_dick_content_doc.xhtml");
-            var contentDoc = (new window.DOMParser).parseFromString(contentDocXhtml, "text/xml");
+            var contentDoc = XmlParse.fromString(contentDocXhtml);
             var packageDocXhtml = jasmine.getFixtures().read("moby_dick_package.opf");
-            var packageDoc = (new window.DOMParser).parseFromString(packageDocXhtml, "text/xml");
+            var packageDoc = XmlParse.fromString(packageDocXhtml);
 
             var contentDocCFIComponent = EPUBcfi.Generator.generateCharacterOffsetCFIComponent($("#c01p0008", contentDoc)[0].firstChild, 103);
             var packageDocCFIComponent = EPUBcfi.Generator.generatePackageDocumentCFIComponent("xchapter_001", packageDoc);
@@ -921,9 +921,9 @@ describe("CFI GENERATOR", function () {
         it("can generate a CFI without a terminus", function () {
 
             var contentDocXhtml = jasmine.getFixtures().read("moby_dick_content_doc.xhtml");
-            var contentDoc = (new window.DOMParser).parseFromString(contentDocXhtml, "text/xml");
+            var contentDoc = XmlParse.fromString(contentDocXhtml);
             var packageDocXhtml = jasmine.getFixtures().read("moby_dick_package.opf");
-            var packageDoc = (new window.DOMParser).parseFromString(packageDocXhtml, "text/xml");
+            var packageDoc = XmlParse.fromString(packageDocXhtml);
 
             var contentDocCFIComponent = EPUBcfi.Generator.generateElementCFIComponent($("#c01p0008", contentDoc)[0]);
             var packageDocCFIComponent = EPUBcfi.Generator.generatePackageDocumentCFIComponent("xchapter_001", packageDoc);
@@ -935,9 +935,9 @@ describe("CFI GENERATOR", function () {
         it("can generate a CFI without a terminus when the start element is the 'html' element", function () {
 
             var contentDocXhtml = jasmine.getFixtures().read("moby_dick_content_doc.xhtml");
-            var contentDoc = (new window.DOMParser).parseFromString(contentDocXhtml, "text/xml");
+            var contentDoc = XmlParse.fromString(contentDocXhtml);
             var packageDocXhtml = jasmine.getFixtures().read("moby_dick_package.opf");
-            var packageDoc = (new window.DOMParser).parseFromString(packageDocXhtml, "text/xml");
+            var packageDoc = XmlParse.fromString(packageDocXhtml);
 
             var contentDocCFIComponent = EPUBcfi.Generator.generateElementCFIComponent($("html", contentDoc)[0]);
             var packageDocCFIComponent = EPUBcfi.Generator.generatePackageDocumentCFIComponent("xchapter_001", packageDoc);
@@ -958,9 +958,9 @@ describe("CFI GENERATOR", function () {
         beforeEach(function () {
 
             contentDocXhtml = jasmine.getFixtures().read("moby_dick_content_doc.xhtml");
-            contentDoc = (new window.DOMParser).parseFromString(contentDocXhtml, "text/xml");
+            contentDoc = XmlParse.fromString(contentDocXhtml);
             packageDocXhtml = jasmine.getFixtures().read("moby_dick_package.opf");
-            packageDoc = (new window.DOMParser).parseFromString(packageDocXhtml, "text/xml");
+            packageDoc = XmlParse.fromString(packageDocXhtml);
             startTextNode = $("#c01p0008", contentDoc)[0].firstChild;
         });
 
diff --git a/spec/models/cfi_instructions_spec.js b/spec/models/cfi_instructions_spec.js
index 6a48948..a3de6ca 100644
--- a/spec/models/cfi_instructions_spec.js
+++ b/spec/models/cfi_instructions_spec.js
@@ -4,8 +4,8 @@ describe("CFI INSTRUCTION OBJECT", function () {
     it("finds the target element on an index step", function () {
 
         var contentDocXHTML = jasmine.getFixtures().read('moby_dick_content_doc.xhtml');
-        var domParser = new window.DOMParser();
-        var contentDoc = domParser.parseFromString(contentDocXHTML, "text/xml");
+        
+        var contentDoc = XmlParse.fromString(contentDocXHTML);
 
         var $nextNode = EPUBcfi.Instructions.getNextNode(4, $(contentDoc.firstChild), ["cfiMarker"]);
         var nodeType = $nextNode.is("body");
@@ -63,8 +63,8 @@ describe("CFI INSTRUCTION OBJECT", function () {
     it("injects text at the specified offset", function () {
 
         var contentDocXHTML = jasmine.getFixtures().read('moby_dick_content_doc.xhtml');
-        var domParser = new window.DOMParser();
-        var contentDoc = domParser.parseFromString(contentDocXHTML, "text/xml");
+        
+        var contentDoc = XmlParse.fromString(contentDocXHTML);
 
         var $injectedElement = EPUBcfi.Instructions.textTermination($($("#c01p0002", $(contentDoc))[0].firstChild), 4, '<span id="injected" class="epub_cfi"></span>');
 
@@ -103,9 +103,9 @@ describe("CFI INSTRUCTION OBJECT", function () {
 
     it('excludes elements that have a class that indicates they are "cfi markers" and returns a list of text nodes', function () {
 
-        var domParser = new window.DOMParser();
+        
         var xhtml = '<body><div>asdfsd <div class="cfiMarker"></div> ddfd</div><div></div></body>';
-        var doc = domParser.parseFromString(xhtml, 'text/xml');
+        var doc = XmlParse.fromString(xhtml);
         var $currentNode = $(doc.firstChild.firstChild);
 
         var $result = EPUBcfi.Instructions.followIndexStep(1, $currentNode, ["cfiMarker"], []);
@@ -116,9 +116,9 @@ describe("CFI INSTRUCTION OBJECT", function () {
 
     it('returns the correct text node if the first text node is empty', function () {
 
-        var domParser = new window.DOMParser();
+        
         var xhtml = '<div><div>text1</div>text2</div>';
-        var doc = domParser.parseFromString(xhtml, 'text/xml');
+        var doc = XmlParse.fromString(xhtml);
         var $currentNode = $(doc.firstChild);
 
         var $result = EPUBcfi.Instructions.followIndexStep(3, $currentNode, ["cfiMarker"], []);
@@ -128,9 +128,9 @@ describe("CFI INSTRUCTION OBJECT", function () {
 
     it('returns the correct text node if a previous one contains a comment node', function () {
 
-        var domParser = new window.DOMParser();
+        
         var xhtml = '<div>text1<!--comment-->text2<div>text</div>text3</div>';
-        var doc = domParser.parseFromString(xhtml, 'text/xml');
+        var doc = XmlParse.fromString(xhtml);
         var $currentNode = $(doc.firstChild);
 
         var $result = EPUBcfi.Instructions.followIndexStep(3, $currentNode, ["cfiMarker"], []);
@@ -140,9 +140,9 @@ describe("CFI INSTRUCTION OBJECT", function () {
 
     it('returns the correct text node if it contains a comment node', function () {
 
-        var domParser = new window.DOMParser();
+        
         var xhtml = '<div>text1<div>text</div>text2<!--comment-->text3</div>';
-        var doc = domParser.parseFromString(xhtml, 'text/xml');
+        var doc = XmlParse.fromString(xhtml);
         var $currentNode = $(doc.firstChild);
 
         var $result = EPUBcfi.Instructions.followIndexStep(3, $currentNode, ["cfiMarker"], []);
@@ -154,9 +154,9 @@ describe("CFI INSTRUCTION OBJECT", function () {
 
     it('returns the correct text node if it contains a processing instruction node', function () {
 
-        var domParser = new window.DOMParser();
+        
         var xhtml = '<div>text1<div>text</div>text2<?xml-stylesheet type="text/css" href="style.css"?>text3</div>';
-        var doc = domParser.parseFromString(xhtml, 'text/xml');
+        var doc = XmlParse.fromString(xhtml);
         var $currentNode = $(doc.firstChild);
 
         var $result = EPUBcfi.Instructions.followIndexStep(3, $currentNode, ["cfiMarker"], []);
@@ -168,9 +168,9 @@ describe("CFI INSTRUCTION OBJECT", function () {
 
     it('returns the correct text node if it start with a processing instruction node', function () {
 
-        var domParser = new window.DOMParser();
+        
         var xhtml = '<div><?xml-stylesheet type="text/css" href="style.css"?>text</div>';
-        var doc = domParser.parseFromString(xhtml, 'text/xml');
+        var doc = XmlParse.fromString(xhtml);
         var $currentNode = $(doc.firstChild);
 
         var $result = EPUBcfi.Instructions.followIndexStep(1, $currentNode, ["cfiMarker"], []);
@@ -181,9 +181,9 @@ describe("CFI INSTRUCTION OBJECT", function () {
 
     it('returns the correct text node if the node is in the first position of a set of child nodes', function () {
 
-        var domParser = new window.DOMParser();
+        
         var xhtml = '<div>text1<div></div>text2<div></div>text3</div>';
-        var doc = domParser.parseFromString(xhtml, 'text/xml');
+        var doc = XmlParse.fromString(xhtml);
         var $currentNode = $(doc.firstChild);
 
         var $result = EPUBcfi.Instructions.followIndexStep(1, $currentNode, ["cfiMarker"], []);
@@ -193,9 +193,9 @@ describe("CFI INSTRUCTION OBJECT", function () {
 
     it('returns the correct text node if the node is between elements in a set of child nodes', function () {
 
-        var domParser = new window.DOMParser();
+        
         var xhtml = '<div>text1<div></div>text2<div></div>text3</div>';
-        var doc = domParser.parseFromString(xhtml, 'text/xml');
+        var doc = XmlParse.fromString(xhtml);
         var $currentNode = $(doc.firstChild);
 
         var $result = EPUBcfi.Instructions.followIndexStep(3, $currentNode, ["cfiMarker"], []);
@@ -205,9 +205,9 @@ describe("CFI INSTRUCTION OBJECT", function () {
 
     it('returns the correct text node if the node is the last in a set of child nodes', function () {
 
-        var domParser = new window.DOMParser();
+        
         var xhtml = '<div>text1<div></div>text2<div></div>text3</div>';
-        var doc = domParser.parseFromString(xhtml, 'text/xml');
+        var doc = XmlParse.fromString(xhtml);
         var $currentNode = $(doc.firstChild);
 
         var $result = EPUBcfi.Instructions.followIndexStep(5, $currentNode, ["cfiMarker"], []);
@@ -382,8 +382,8 @@ describe('CFI INSTRUCTION ERROR HANDLING', function () {
     it('throws an out of range error for an index step', function () {
 
         var contentDocXHTML = jasmine.getFixtures().read('moby_dick_content_doc.xhtml');
-        var domParser = new window.DOMParser();
-        var contentDoc = domParser.parseFromString(contentDocXHTML, "text/xml");
+        
+        var contentDoc = XmlParse.fromString(contentDocXHTML);
 
         // A step of 16 is greater than the number of child elements of the content document
         expect(function () {
@@ -422,9 +422,9 @@ describe('CFI INSTRUCTION ERROR HANDLING', function () {
 
         var packageDocXML = jasmine.getFixtures().read('moby_dick_package.opf');
         var contentDocXHTML = jasmine.getFixtures().read('moby_dick_content_doc.xhtml');
-        var domParser = new window.DOMParser();
-        var packageDoc = domParser.parseFromString(packageDocXML, "text/xml");
-        var contentDoc = domParser.parseFromString(contentDocXHTML, "text/xml");
+        
+        var packageDoc = XmlParse.fromString(packageDocXML);
+        var contentDoc = XmlParse.fromString(contentDocXHTML);
         var spineElement = $($(packageDoc.firstChild).children()[2]).children()[6];
 
         var nextNode;
diff --git a/spec/models/cfi_interpreter_spec.js b/spec/models/cfi_interpreter_spec.js
index 1c5a1ab..2dd1abd 100644
--- a/spec/models/cfi_interpreter_spec.js
+++ b/spec/models/cfi_interpreter_spec.js
@@ -14,18 +14,18 @@ describe('CFI INTERPRETER OBJECT', function () {
         CFIAST = EPUBcfi.Parser.parse(CFI);
 
         // Set up package document
-        var domParser = new window.DOMParser();
+        
         var packageDocXML = jasmine.getFixtures().read("moby_dick_package.opf");
-        $packageDocument = $(domParser.parseFromString(packageDocXML, "text/xml"));
+        $packageDocument = $(XmlParse.fromString(packageDocXML));
 
         // Set up content document
         var contentDocXHTML = jasmine.getFixtures().read("moby_dick_content_doc.xhtml");
-        contentDocument = domParser.parseFromString(contentDocXHTML, 'text/xml');
+        contentDocument = XmlParse.fromString(contentDocXHTML);
         $contentDocument = $(contentDocument);
 
         spyOn($, "ajax").and.callFake(function (params) {
 
-            params.success(domParser.parseFromString(contentDocXHTML, 'text/xml'));
+            params.success(XmlParse.fromString(contentDocXHTML));
         });
     });
 
@@ -49,7 +49,7 @@ describe('CFI INTERPRETER OBJECT', function () {
             +     "<div></div>"
             + "</html>";
 
-        var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));         
+        var $dom = $(XmlParse.fromString(dom));         
 
         var CFI = "epubcfi(/6/14!/4/2[startParent],/1:22,/1:27)";
 
@@ -79,7 +79,7 @@ describe('CFI INTERPRETER OBJECT', function () {
             +     "<div></div>"
             + "</html>";
 
-        var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));         
+        var $dom = $(XmlParse.fromString(dom));         
 
         var CFI = "epubcfi(/6/14!/4/2[startParent],/1:57,/1:62)";
 
@@ -110,7 +110,7 @@ describe('CFI INTERPRETER OBJECT', function () {
             +     "<div></div>"
             + "</html>";
 
-        var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));         
+        var $dom = $(XmlParse.fromString(dom));         
 
         var CFI = "epubcfi(/6/14!/4/2[startParent],/1:73,/1:78)";
 
@@ -143,7 +143,7 @@ describe('CFI INTERPRETER OBJECT', function () {
             +     "<div></div>"
             + "</html>";
 
-        var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));         
+        var $dom = $(XmlParse.fromString(dom));         
 
         var CFI = "epubcfi(/6/14!/4/2[startParent],/1:6,/1:7)";
 
@@ -194,7 +194,7 @@ describe('CFI INTERPRETER OBJECT', function () {
             +     "<div></div>"
             + "</html>";
 
-        var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));         
+        var $dom = $(XmlParse.fromString(dom));         
 
         var CFI = "epubcfi(/6/14!/4/2[start.Parent],/1:6,/1:8)";
 
@@ -230,7 +230,7 @@ describe('CFI INTERPRETER OBJECT', function () {
             +     "<div></div>"
             + "</html>";
 
-        var $dom = $((new window.DOMParser).parseFromString(dom, "text/xml"));         
+        var $dom = $(XmlParse.fromString(dom));         
 
         var CFI = "epubcfi(/6/14!/4/2[startParent],/1:6,/1:8)";
 
@@ -738,17 +738,17 @@ describe('ERROR HANDLING FOR ID AND TEXT ASSERTIONS', function () {
         beforeEach(function () {
 
             // Set up package document
-            var domParser = new window.DOMParser();
+            
             var packageDocXML = jasmine.getFixtures().read("moby_dick_package.opf");
-            $packageDocument = $(domParser.parseFromString(packageDocXML, "text/xml"));
+            $packageDocument = $(XmlParse.fromString(packageDocXML));
 
             // Set up content document
             var contentDocXHTML = jasmine.getFixtures().read("moby_dick_content_doc.xhtml");
-            $contentDocument = $(domParser.parseFromString(contentDocXHTML, 'text/xml'));
+            $contentDocument = $(XmlParse.fromString(contentDocXHTML));
 
             spyOn($, "ajax").and.callFake(function (params) {
 
-                params.success(domParser.parseFromString(contentDocXHTML, 'text/xml'));
+                params.success(XmlParse.fromString(contentDocXHTML));
             });
         });