SVG.Use = SVG.invent({ // Initialize node create: 'use' // Inherit from , inherit: SVG.Shape // Add class methods , extend: { // Use element as a reference element: function(element, file) { // Set lined element return this.attr('href', (file || '') + '#' + element, SVG.xlink) } } // Add parent method , construct: { // Create a use element use: function(element, file) { return this.put(new SVG.Use).element(element, file) } } })