<DataSource ID="GmailAttachmentDS"
            serverConstructor="com.isomorphic.mail.GmailAttachmentDataSource"
>
	<fields>
		<field name="userId" type="text" primaryKey="true"/>
		<field name="messageId" type="text" primaryKey="true"/>
		<field name="attachmentId" type="text" primaryKey="true"/>
		<field name="file" type="binary"/>
	</fields>
</DataSource>
