Why are the recovery extension properties declared twice in the 4.2.2.GA sample jbossjta-properties.xml file? This causes all kinds of endless frustration to the hapless developer..

<?xml version="1.0" encoding="UTF-8"?>
<transaction-service>
 <properties depends="common" name="arjuna">
 <!--
 Transaction Reaper Timeout (default is 120000 microseconds).
 -->
 <property
 name="com.arjuna.ats.arjuna.coordinator.txReaperTimeout" value="120000"/>
 <!--
 Transaction Reaper Mode, can be: NORMAL or DYNAMIC (default is NORMAL).
 -->
 <property name="com.arjuna.ats.arjuna.coordinator.txReaperMode" value="NORMAL"/>
 <!--
 (default is NO)
 -->
 <property name="com.arjuna.ats.arjuna.coordinator.asyncCommit" value="NO"/>
 <!--
 (default is NO)
 -->
 <property name="com.arjuna.ats.arjuna.coordinator.asyncPrepare" value="NO"/>
 <!--
 (default is YES)
 -->
 <property
 name="com.arjuna.ats.arjuna.coordinator.commitOnePhase" value="YES"/>
 <!--
 (default is defaultStore)
 -->
 <property name="com.arjuna.ats.arjuna.objectstore.localOSRoot" value="defaultStore"/>
 <!--
 default is under user.home - must be writeable!)
 -->
 <property
 name="com.arjuna.ats.arjuna.objectstore.objectStoreDir" value="PutObjectStoreDirHere"/>
 <!--
 (default is ON)
 -->
 <property
 name="com.arjuna.ats.arjuna.objectstore.objectStoreSync" value="ON"/>
 <!--
 (default is ShadowNoFileLockStore)
 -->
 <property
 name="com.arjuna.ats.arjuna.objectstore.objectStoreType" value="ShadowNoFileLockStore"/>
 <!--
 (default is 255)
 -->
 <property
 name="com.arjuna.ats.arjuna.objectstore.hashedDirectories" value="255"/>
 <!--
 (default is ON)
 -->
 <property
 name="com.arjuna.ats.arjuna.objectstore.transactionSync" value="ON"/>
 <!--
 (Must be unique across all Arjuna instances.)
 -->
 <property name="com.arjuna.ats.arjuna.xa.nodeIdentifier" value="1"/>
 <!-- property
 name="com.arjuna.ats.arjuna.coordinator.actionStore"
 value="HashedActionStore"
 value="JDBCActionStore"
 -->
 <!-- property
 name="com.arjuna.ats.arjuna.objectstore.jdbcTxDbAccess"
 value="JDBCAccess"
 -->
 <!-- property
 name="com.arjuna.ats.arjuna.objectstore.objectStoreType"
 value="ShadowNoFileLockStore"
 value="JDBCStore"
 -->
 <!-- property
 name="com.arjuna.ats.arjuna.objectstore.jdbcUserDbAccess"
 value="JDBCAccess"
 -->
 <!-- property
 name="com.arjuna.ats.arjuna.objectstore.jdbcPoolSizeInitial"
 value="1"
 -->
 <!-- property
 name="com.arjuna.ats.arjuna.objectstore.jdbcPoolSizeMaximum"
 value="1"
 -->
 <!-- property
 name="com.arjuna.ats.arjuna.objectstore.jdbcPoolPutConnections"
 value="false"
 -->
 <!-- property
 name="com.arjuna.ats.arjuna.internal.arjuna.objectstore.cacheStore.size"
 value=""
 -->
 <!-- property
 name="com.arjuna.ats.arjuna.internal.arjuna.objectstore.cacheStore.period"
 value=""
 -->
 <!--
 The location for creating temporary files, e.g., Uids.
 Default is under user.home.
 IMPORTANT: make sure the directory is lockable, e.g., /tmp on Unix
 may not be!
 -->
 <!--
 <property
 name="com.arjuna.ats.arjuna.common.varDir"
 value="var"/>
 -->
 </properties>
 <properties depends="arjuna" name="recoverymanager">
 <!--
 Properties used only by the RecoveryManager.
 -->
 <!--
 Periodic recovery settings.
 Time values in this section are in seconds.
 -->
 <!--
 Interval in seconds between initiating the periodic recovery modules.
 Default is 120 seconds.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.periodicRecoveryPeriod" value="120"/>
 <!--
 Interval in seconds between first and second pass of periodic recovery.
 Default is 10 seconds.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.recoveryBackoffPeriod" value="10"/>
 <!--
 Periodic recovery modules to use. Invoked in sort-order of names.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.recoveryExtension1" value="com.arjuna.ats.internal.arjuna.recovery.AtomicActionRecoveryModule"/>
 <property
 name="com.arjuna.ats.arjuna.recovery.recoveryExtension2" value="com.arjuna.ats.internal.txoj.recovery.TORecoveryModule"/>
 <!--
 Expired entry removal
 -->
 <!--
 Expiry scanners to use (order of invocation is random).
 Names must begin with "com.arjuna.ats.arjuna.recovery.expiryScanner"
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.expiryScannerTransactionStatusManager" value="com.arjuna.ats.internal.arjuna.recovery.ExpiredTransactionStatusManagerScanner"/>
 <!--
 Interval, in hours, between running the expiry scanners.
 This can be quite long. The absolute value determines the interval -
 if the value is negative, the scan will NOT be run until after one
 interval has elapsed. If positive the first scan will be immediately
 after startup. Zero will prevent any scanning.
 Default = 12 = run immediately, then every 12 hours.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.expiryScanInterval" value="12"/>
 <!--
 Age, in hours, for removal of transaction status manager item.
 This should be longer than any ts-using process will remain running.
 Zero = Never removed. Default is 12.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.transactionStatusManagerExpiryTime" value="12"/>
 <!--
 Use this to fix the port on which the TransactionStatusManager listens,
 The default behaviour is to use any free port.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.transactionStatusManagerPort" value="0"/>
 <!--
 Properties used only by the RecoveryManager.
 -->
 <!--
 Periodic recovery settings.
 Time values in this section are in seconds.
 -->
 <!--
 Interval in seconds between initiating the periodic recovery modules.
 Default is 120 seconds.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.periodicRecoveryPeriod" value="120"/>
 <!--
 Interval in seconds between first and second pass of periodic recovery.
 Default is 10 seconds.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.recoveryBackoffPeriod" value="10"/>
 <!--
 Periodic recovery modules to use. Invoked in sort-order of names.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.recoveryExtension1" value="com.arjuna.ats.internal.arjuna.recovery.AtomicActionRecoveryModule"/>
 <property
 name="com.arjuna.ats.arjuna.recovery.recoveryExtension2" value="com.arjuna.ats.internal.txoj.recovery.TORecoveryModule"/>
 <property
 name="com.arjuna.ats.arjuna.recovery.recoveryExtension3" value="com.arjuna.ats.internal.jta.recovery.arjunacore.XARecoveryModule"/>
 <!--
 Expired entry removal
 -->
 <!--
 Expiry scanners to use (order of invocation is random).
 Names must begin with "com.arjuna.ats.arjuna.recovery.expiryScanner"
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.expiryScannerTransactionStatusManager" value="com.arjuna.ats.internal.arjuna.recovery.ExpiredTransactionStatusManagerScanner"/>
 <!--
 Interval, in hours, between running the expiry scanners.
 This can be quite long. The absolute value determines the interval -
 if the value is negative, the scan will NOT be run until after one
 interval has elapsed. If positive the first scan will be immediately
 after startup. Zero will prevent any scanning.
 Default = 12 = run immediately, then every 12 hours.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.expiryScanInterval" value="12"/>
 <!--
 Age, in hours, for removal of transaction status manager item.
 This should be longer than any ts-using process will remain running.
 Zero = Never removed. Default is 12.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.transactionStatusManagerExpiryTime" value="12"/>
 <!--
 Use this to fix the port on which the TransactionStatusManager listens,
 The default behaviour is to use any free port.
 -->
 <property
 name="com.arjuna.ats.arjuna.recovery.transactionStatusManagerPort" value="0"/>
 </properties>
 <properties name="common">
 <!-- CLF 2.0 properties -->
 <property name="com.arjuna.common.util.logging.DebugLevel"
 type="System" value="0x00000000"/>
 <property name="com.arjuna.common.util.logging.FacilityLevel"
 type="System" value="0xffffffff"/>
 <property name="com.arjuna.common.util.logging.VisibilityLevel"
 type="System" value="0xffffffff"/>
 <property name="com.arjuna.common.util.logger" type="System" value="log4j"/>
 </properties>
 <properties depends="arjuna" name="txoj">
 <!--
 (default is LockStore of installation - must be writeable!)
 -->
 <!--
 <property
 name="com.arjuna.ats.txoj.lockstore.lockStoreDir"
 value="LockStore"/>
 -->
 <!--
 (default is BasicLockStore)
 -->
 <property name="com.arjuna.ats.txoj.lockstore.lockStoreType" value="BasicLockStore"/>
 <!--
 (default is NO)
 -->
 <property name="com.arjuna.ats.txoj.lockstore.multipleLockStore" value="NO"/>
 <!--
 (default is YES)
 -->
 <property name="com.arjuna.ats.txoj.lockstore.singleLockStore" value="YES"/>
 <!--
 (default is YES)
 -->
 <property
 name="com.arjuna.ats.txoj.lockstore.allowNestedLocking" value="YES"/>
 </properties>
 <properties depends="arjuna" name="jta">
 <!--
 Support subtransactions in the JTA layer?
 Default is NO.
 -->
 <property name="com.arjuna.ats.jta.supportSubtransactions" value="NO"/>
 <property name="com.arjuna.ats.jta.jtaTMImplementation" value="com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionManagerImple"/>
 <!--
 com.arjuna.ats.internal.jta.transaction.jts.TransactionManagerImple
 -->
 <property name="com.arjuna.ats.jta.jtaUTImplementation" value="com.arjuna.ats.internal.jta.transaction.arjunacore.UserTransactionImple"/>
 <!--
 com.arjuna.ats.internal.jta.transaction.jts.UserTransactionImple
 -->
 </properties>
 <properties depends="jta" name="jdbc">
 <!--
 property name="com.arjuna.ats.jdbc.isolationLevel" value="TRANSACTION_SERIALIZABLE"/>
 -->
 </properties>
</transaction-service>