diff --git a/db/install.xml b/db/install.xml
index 63b8777..1bc5a05 100644
--- a/db/install.xml
+++ b/db/install.xml
@@ -1,15 +1,15 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<XMLDB PATH="mod/attendance/db" VERSION="20090112" COMMENT="XMLDB file for Moodle mod/attendance"
+<XMLDB PATH="mod/attendance/db" VERSION="20130704" COMMENT="XMLDB file for Moodle mod/attendance"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
-    <TABLE NAME="attendance" COMMENT="Module for support Attendances" NEXT="attendance_sessions">
+    <TABLE NAME="attendance" COMMENT="Attendance module table">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" COMMENT="id of the table, please edit me" NEXT="course"/>
-        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="name"/>
-        <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="course" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="false" DEFAULT="100" SEQUENCE="false" COMMENT="This is maximum grade for instance" PREVIOUS="name"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true" COMMENT="id of the table, please edit me"/>
+        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false"/>
+        <FIELD NAME="grade" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="100" SEQUENCE="false" COMMENT="This is maximum grade for instance"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="Primary key for attendance"/>
@@ -18,65 +18,65 @@
         <INDEX NAME="course" UNIQUE="false" FIELDS="course"/>
       </INDEXES>
     </TABLE>
-    <TABLE NAME="attendance_sessions" COMMENT="attendance_sessions table retrofitted from MySQL" PREVIOUS="attendance" NEXT="attendance_log">
+    <TABLE NAME="attendance_sessions" COMMENT="attendance_sessions table retrofitted from MySQL">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="attendanceid"/>
-        <FIELD NAME="attendanceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="groupid"/>
-        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="attendanceid" NEXT="sessdate"/>
-        <FIELD NAME="sessdate" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="groupid" NEXT="duration"/>
-        <FIELD NAME="duration" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="sessdate" NEXT="lasttaken"/>
-        <FIELD NAME="lasttaken" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="duration" NEXT="lasttakenby"/>
-        <FIELD NAME="lasttakenby" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="lasttaken" NEXT="timemodified"/>
-        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" UNSIGNED="true" SEQUENCE="false" PREVIOUS="lasttakenby" NEXT="description"/>
-        <FIELD NAME="description" TYPE="text" LENGTH="small" NOTNULL="true" SEQUENCE="false" PREVIOUS="timemodified" NEXT="descriptionformat"/>
-        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="description"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
+        <FIELD NAME="attendanceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="sessdate" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="duration" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="lasttaken" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false"/>
+        <FIELD NAME="lasttakenby" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="false" SEQUENCE="false"/>
+        <FIELD NAME="description" TYPE="text" NOTNULL="true" SEQUENCE="false"/>
+        <FIELD NAME="descriptionformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="Primary key for attendance_sessions"/>
       </KEYS>
       <INDEXES>
-        <INDEX NAME="attendanceid" UNIQUE="false" FIELDS="attendanceid" NEXT="groupid"/>
-        <INDEX NAME="groupid" UNIQUE="false" FIELDS="groupid" PREVIOUS="attendanceid" NEXT="sessdate"/>
-        <INDEX NAME="sessdate" UNIQUE="false" FIELDS="sessdate" PREVIOUS="groupid"/>
+        <INDEX NAME="attendanceid" UNIQUE="false" FIELDS="attendanceid"/>
+        <INDEX NAME="groupid" UNIQUE="false" FIELDS="groupid"/>
+        <INDEX NAME="sessdate" UNIQUE="false" FIELDS="sessdate"/>
       </INDEXES>
     </TABLE>
-    <TABLE NAME="attendance_log" COMMENT="attendance_log table retrofitted from MySQL" PREVIOUS="attendance_sessions" NEXT="attendance_statuses">
+    <TABLE NAME="attendance_log" COMMENT="attendance_log table retrofitted from MySQL">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="sessionid"/>
-        <FIELD NAME="sessionid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="studentid"/>
-        <FIELD NAME="studentid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="sessionid" NEXT="statusid"/>
-        <FIELD NAME="statusid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="link with attendance_status table" PREVIOUS="studentid" NEXT="statusset"/>
-        <FIELD NAME="statusset" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false" PREVIOUS="statusid" NEXT="timetaken"/>
-        <FIELD NAME="timetaken" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" COMMENT="When attendance of this student was taken" PREVIOUS="statusset" NEXT="takenby"/>
-        <FIELD NAME="takenby" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="timetaken" NEXT="remarks"/>
-        <FIELD NAME="remarks" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false" PREVIOUS="takenby"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
+        <FIELD NAME="sessionid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="studentid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="statusid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="link with attendance_status table"/>
+        <FIELD NAME="statusset" TYPE="char" LENGTH="100" NOTNULL="false" SEQUENCE="false"/>
+        <FIELD NAME="timetaken" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="When attendance of this student was taken"/>
+        <FIELD NAME="takenby" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="remarks" TYPE="char" LENGTH="255" NOTNULL="false" SEQUENCE="false"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="Primary key for attendance_log"/>
       </KEYS>
       <INDEXES>
-        <INDEX NAME="sessionid" UNIQUE="false" FIELDS="sessionid" NEXT="studentid"/>
-        <INDEX NAME="studentid" UNIQUE="false" FIELDS="studentid" PREVIOUS="sessionid" NEXT="statusid"/>
-        <INDEX NAME="statusid" UNIQUE="false" FIELDS="statusid" PREVIOUS="studentid"/>
+        <INDEX NAME="sessionid" UNIQUE="false" FIELDS="sessionid"/>
+        <INDEX NAME="studentid" UNIQUE="false" FIELDS="studentid"/>
+        <INDEX NAME="statusid" UNIQUE="false" FIELDS="statusid"/>
       </INDEXES>
     </TABLE>
-    <TABLE NAME="attendance_statuses" COMMENT="attendance_statuses table retrofitted from MySQL" PREVIOUS="attendance_log">
+    <TABLE NAME="attendance_statuses" COMMENT="attendance_statuses table retrofitted from MySQL">
       <FIELDS>
-        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" SEQUENCE="true" NEXT="attendanceid"/>
-        <FIELD NAME="attendanceid" TYPE="int" LENGTH="10" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="id" NEXT="acronym"/>
-        <FIELD NAME="acronym" TYPE="char" LENGTH="2" NOTNULL="true" SEQUENCE="false" PREVIOUS="attendanceid" NEXT="description"/>
-        <FIELD NAME="description" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false" PREVIOUS="acronym" NEXT="grade"/>
-        <FIELD NAME="grade" TYPE="int" LENGTH="3" NOTNULL="true" UNSIGNED="false" DEFAULT="0" SEQUENCE="false" PREVIOUS="description" NEXT="visible"/>
-        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="1" SEQUENCE="false" PREVIOUS="grade" NEXT="deleted"/>
-        <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="true" UNSIGNED="true" DEFAULT="0" SEQUENCE="false" PREVIOUS="visible"/>
+        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
+        <FIELD NAME="attendanceid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="acronym" TYPE="char" LENGTH="2" NOTNULL="true" SEQUENCE="false"/>
+        <FIELD NAME="description" TYPE="char" LENGTH="30" NOTNULL="true" SEQUENCE="false"/>
+        <FIELD NAME="grade" TYPE="int" LENGTH="3" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
+        <FIELD NAME="visible" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false"/>
+        <FIELD NAME="deleted" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
       </FIELDS>
       <KEYS>
         <KEY NAME="primary" TYPE="primary" FIELDS="id" COMMENT="Primary key for attendance_settings"/>
       </KEYS>
       <INDEXES>
-        <INDEX NAME="attendanceid" UNIQUE="false" FIELDS="attendanceid" NEXT="visible"/>
-        <INDEX NAME="visible" UNIQUE="false" FIELDS="visible" PREVIOUS="attendanceid" NEXT="deleted"/>
-        <INDEX NAME="deleted" UNIQUE="false" FIELDS="deleted" PREVIOUS="visible"/>
+        <INDEX NAME="attendanceid" UNIQUE="false" FIELDS="attendanceid"/>
+        <INDEX NAME="visible" UNIQUE="false" FIELDS="visible"/>
+        <INDEX NAME="deleted" UNIQUE="false" FIELDS="deleted"/>
       </INDEXES>
     </TABLE>
   </TABLES>