How to set transaction isolation with XA

Hi all.
Is there a way to declaratively set the JDBC transaction isolation either in the jboss transaction manager

    <jbossts:transaction-manager>
        ...
    </jbossts:transaction-manager>

or in a MySQL XA datasource

    <spring:bean id="jdbcDataSource" class="com.mysql.jdbc.jdbc2.optional.MysqlXADataSource" destroy-method="shutdown">
            <spring:property name="url" value="...."/>
            <spring:property name="user" value="..."/>
            <spring:property name="password" value="..."/>
            ...
    </spring:bean>

Thanks in advance

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