diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..485dee6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea
diff --git a/lib/scorm.rb b/lib/scorm.rb
index 1bd9be1..a8496d5 100644
--- a/lib/scorm.rb
+++ b/lib/scorm.rb
@@ -1,5 +1,5 @@
 module Scorm
-  VERSION = '1.0.2'
+  VERSION = '1.0.4'
 end
 
-require 'scorm/package'
\ No newline at end of file
+require 'scorm/package'
diff --git a/lib/scorm/datatypes.rb b/lib/scorm/datatypes.rb
index 5bf3196..17fdfce 100644
--- a/lib/scorm/datatypes.rb
+++ b/lib/scorm/datatypes.rb
@@ -51,6 +51,24 @@ def to_s
         sec -= min*60
         return "#{hours}:#{min}:#{sec}"
       end
+
+      def to_scorm_s
+        sec = self.to_f
+        hours = (sec/60/60).to_i
+        sec -= hours*60*60
+        min = (sec/60).to_i
+        sec -= min*60
+        sec = (sec*100).round/100.0
+
+        rtn_str = "PT"
+        if hours > 0
+          rtn_str += "#{hours}H"
+        end
+        if min > 0
+          rtn_str += "#{min}M"
+        end
+        rtn_str += "#{sec}S"
+      end
     end
     
   end
diff --git a/lib/scorm/resource.rb b/lib/scorm/resource.rb
index 3626a72..cc37b86 100644
--- a/lib/scorm/resource.rb
+++ b/lib/scorm/resource.rb
@@ -28,19 +28,28 @@ def initialize(id, type, scorm_type, href = nil, metadata = nil, files = nil, de
     def self.from_xml(element)
       metadata = nil
       files = []
+      xml_base = element.attribute('xml:base').to_s
+
       REXML::XPath.each(element, 'file') do |file_el|
-        files << element.attribute('xml:base').to_s + file_el.attribute('href').to_s
+        file = file_el.attribute('href').to_s
+        if xml_base.end_with?('/') || file.start_with?('/')
+          files << xml_base + file
+        else
+          files << xml_base + '/' + file
+        end
       end
       dependencies = []
       REXML::XPath.each(element, 'dependency') do |dep_el|
         dependencies << dep_el.attribute('identifierref').to_s
       end
-    
+
+
+
       res = self.new(
         element.attribute('identifier'), 
         element.attribute('type'), 
         element.attribute('scormType', 'adlcp') || element.attribute('scormtype', 'adlcp'),
-        element.attribute('xml:base').to_s + element.attribute('href').to_s,
+        xml_base + element.attribute('href').to_s,
         metadata,
         files,
         dependencies)
diff --git a/scorm.gemspec b/scorm.gemspec
index dd86e97..5c02864 100644
--- a/scorm.gemspec
+++ b/scorm.gemspec
@@ -15,5 +15,5 @@ Gem::Specification.new do |s|
   s.executables        = ['scorm']
   s.default_executable = 'scorm'
 
-  s.add_dependency('rubyzip',  '~> 0.9.4')
-end
\ No newline at end of file
+  s.add_dependency('rubyzip',  '~> 1.0.0')
+end