diff --git a/src/dzitilesource.js b/src/dzitilesource.js
index 5d00980f..817f438e 100644
--- a/src/dzitilesource.js
+++ b/src/dzitilesource.js
@@ -301,7 +301,9 @@ function configureFromXML( tileSource, xmlDoc ){
     } else if ( rootName == "Collection" ) {
         throw new Error( $.getString( "Errors.Dzc" ) );
     } else if ( rootName == "Error" ) {
-        return $._processDZIError( root );
+        var messageNode = root.getElementsByTagName("Message")[0];
+        var message = messageNode.firstChild.nodeValue;
+        throw new Error(message);
     }
 
     throw new Error( $.getString( "Errors.Dzi" ) );
diff --git a/src/openseadragon.js b/src/openseadragon.js
index 07523516..38c24252 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -2548,185 +2548,4 @@ if (typeof define === 'function' && define.amd) {
         }
     }
 
-    /**
-     * @private
-     * @inner
-     * @function
-     * @param {XMLHttpRequest} xhr
-     * @param {String} tilesUrl
-     * @deprecated
-     */
-    function processDZIResponse( xhr, tilesUrl ) {
-        var status,
-            statusText,
-            doc = null;
-
-        if ( !xhr ) {
-            throw new Error( $.getString( "Errors.Security" ) );
-        } else if ( xhr.status !== 200 && xhr.status !== 0 ) {
-            status     = xhr.status;
-            statusText = ( status == 404 ) ?
-                "Not Found" :
-                xhr.statusText;
-            throw new Error( $.getString( "Errors.Status", status, statusText ) );
-        }
-
-        if ( xhr.responseXML && xhr.responseXML.documentElement ) {
-            doc = xhr.responseXML;
-        } else if ( xhr.responseText ) {
-            doc = $.parseXml( xhr.responseText );
-        }
-
-        return processDZIXml( doc, tilesUrl );
-    }
-
-    /**
-     * @private
-     * @inner
-     * @function
-     * @param {Document} xmlDoc
-     * @param {String} tilesUrl
-     * @deprecated
-     */
-    function processDZIXml( xmlDoc, tilesUrl ) {
-
-        if ( !xmlDoc || !xmlDoc.documentElement ) {
-            throw new Error( $.getString( "Errors.Xml" ) );
-        }
-
-        var root     = xmlDoc.documentElement,
-            rootName = root.tagName;
-
-        if ( rootName == "Image" ) {
-            try {
-                return processDZI( root, tilesUrl );
-            } catch ( e ) {
-                throw (e instanceof Error) ?
-                    e :
-                    new Error( $.getString("Errors.Dzi") );
-            }
-        } else if ( rootName == "Collection" ) {
-            throw new Error( $.getString( "Errors.Dzc" ) );
-        } else if ( rootName == "Error" ) {
-            return $._processDZIError( root );
-        }
-
-        throw new Error( $.getString( "Errors.Dzi" ) );
-    }
-
-    /**
-     * @private
-     * @inner
-     * @function
-     * @param {Element} imageNode
-     * @param {String} tilesUrl
-     * @deprecated
-     */
-    function processDZI( imageNode, tilesUrl ) {
-        var fileFormat    = imageNode.getAttribute( "Format" ),
-            sizeNode      = imageNode.getElementsByTagName( "Size" )[ 0 ],
-            dispRectNodes = imageNode.getElementsByTagName( "DisplayRect" ),
-            width         = parseInt( sizeNode.getAttribute( "Width" ), 10 ),
-            height        = parseInt( sizeNode.getAttribute( "Height" ), 10 ),
-            tileSize      = parseInt( imageNode.getAttribute( "TileSize" ), 10 ),
-            tileOverlap   = parseInt( imageNode.getAttribute( "Overlap" ), 10 ),
-            dispRects     = [],
-            dispRectNode,
-            rectNode,
-            i;
-
-        if ( !$.imageFormatSupported( fileFormat ) ) {
-            throw new Error(
-                $.getString( "Errors.ImageFormat", fileFormat.toUpperCase() )
-            );
-        }
-
-        for ( i = 0; i < dispRectNodes.length; i++ ) {
-            dispRectNode = dispRectNodes[ i ];
-            rectNode     = dispRectNode.getElementsByTagName( "Rect" )[ 0 ];
-
-            dispRects.push( new $.DisplayRect(
-                parseInt( rectNode.getAttribute( "X" ), 10 ),
-                parseInt( rectNode.getAttribute( "Y" ), 10 ),
-                parseInt( rectNode.getAttribute( "Width" ), 10 ),
-                parseInt( rectNode.getAttribute( "Height" ), 10 ),
-                0,  // ignore MinLevel attribute, bug in Deep Zoom Composer
-                parseInt( dispRectNode.getAttribute( "MaxLevel" ), 10 )
-            ));
-        }
-        return new $.DziTileSource(
-            width,
-            height,
-            tileSize,
-            tileOverlap,
-            tilesUrl,
-            fileFormat,
-            dispRects
-        );
-    }
-
-    /**
-     * @private
-     * @inner
-     * @function
-     * @param {Element} imageNode
-     * @param {String} tilesUrl
-     * @deprecated
-     */
-    function processDZIJSON( imageData, tilesUrl ) {
-        var fileFormat    = imageData.Format,
-            sizeData      = imageData.Size,
-            dispRectData  = imageData.DisplayRect || [],
-            width         = parseInt( sizeData.Width, 10 ),
-            height        = parseInt( sizeData.Height, 10 ),
-            tileSize      = parseInt( imageData.TileSize, 10 ),
-            tileOverlap   = parseInt( imageData.Overlap, 10 ),
-            dispRects     = [],
-            rectData,
-            i;
-
-        if ( !$.imageFormatSupported( fileFormat ) ) {
-            throw new Error(
-                $.getString( "Errors.ImageFormat", fileFormat.toUpperCase() )
-            );
-        }
-
-        for ( i = 0; i < dispRectData.length; i++ ) {
-            rectData     = dispRectData[ i ].Rect;
-
-            dispRects.push( new $.DisplayRect(
-                parseInt( rectData.X, 10 ),
-                parseInt( rectData.Y, 10 ),
-                parseInt( rectData.Width, 10 ),
-                parseInt( rectData.Height, 10 ),
-                0,  // ignore MinLevel attribute, bug in Deep Zoom Composer
-                parseInt( rectData.MaxLevel, 10 )
-            ));
-        }
-        return new $.DziTileSource(
-            width,
-            height,
-            tileSize,
-            tileOverlap,
-            tilesUrl,
-            fileFormat,
-            dispRects
-        );
-    }
-
-    /**
-     * @private
-     * @inner
-     * @function
-     * @param {Document} errorNode
-     * @throws {Error}
-     * @deprecated
-     */
-    $._processDZIError = function ( errorNode ) {
-        var messageNode = errorNode.getElementsByTagName( "Message" )[ 0 ],
-            message     = messageNode.firstChild.nodeValue;
-
-        throw new Error(message);
-    };
-
-}( OpenSeadragon ));
+}(OpenSeadragon));