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As environment, I have JDK 1.7, Apache ant 1.9.3 , MySQL server 5.5 . I am referencing to this link , I installed the last version of jboss-as-7.1.1 . I am in the step of installing MySQL connector, the problem is that when I add a driver in standalone.xml file there is no change in server it's not added 

<subsystem/>

<subsystem>

<datasources>

<datasource jndi-name="java:jboss/datasources/ExampleDS" pool-name="ExampleDS" enabled="true" use-java-context="true">

<connection-url>jdbc:h2:mem:test;DB_CLOSE_DELAY=-1

</connection-url>

<driver>h2</driver>

<security>

<user-name>sa</user-name>

<password>sa</password>

</security>

</datasource>

<drivers>

<driver name="mysql" module="com.mysql">

<xa-datasource-class>com.mysql.jdbc.Driver</xa-datasource-class>

</driver>

<driver name="h2" module="com.h2database.h2">

<xa-datasource-class>org.h2.jdbcx.JdbcDataSource</xa-datasource-class>

</driver>

</drivers>

</datasources>

</subsystem>