Simple persistence.xml for JavaEE 7

persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" version="2.1">
    <persistence-unit name="myPU" transaction-type="JTA">
        <jta-data-source>java:jboss/datasources/MyDS</jta-data-source>
        <properties>
            <!--
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.format_sql" value="true"/>
            <property name="hibernate.transaction.flush_before_completion" value="true"/>
            <property name="hibernate.dialect" value="org.hibernate.dialect.DerbyDialect"/>
            -->
            <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
            <property name="javax.persistence.schema-generation.scripts.action" value="drop-and-create"/>
            <property name="javax.persistence.schema-generation.scripts.create-target" value="sampleCreate.ddl"/>
            <property name="javax.persistence.schema-generation.scripts.drop-target" value="sampleDrop.ddl"/>
            <!--
            <property name="javax.persistence.sql-load-script-source" value="insert.sql"/>
            -->
        </properties>
    </persistence-unit>
</persistence>

Sources:
http://antoniogoncalves.org/2014/12/11/generating-database-schemas-with-jpa-2-1/
http://wiki.eclipse.org/EclipseLink/Release/2.5/JPA21#DDL_generation