Safe Net in XML

Dear Experts!

Sorry to bother you again, in MS access we have a safe net called Optional Explicit , this helps us to ensure that the code we write is correct , now what about XML do we have any and how do we end statements like below:

<customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui">
</customUI>

foe example I want to add 10 tabs, 10 groups  and 10 controls , how do I end the statements . By the way is it true that if we store the XML statements in a table , then each statement like the one above will look like below:

PK                        RibbonName                XmlRibbon
1                          MyTab                            <customUI xmlns="http://schemas.microsoft.com/office/2006/01/customui">
2                          Mytab                             </customUI>

etc


Kindly assist

Regards

Chris