Indent line in xml after omni-completion

Question

When editing xml, lines are indented when pressing (among others) <, > or <CR> according to the indentkeys setting. For example:

<tag>
    </tag|

If the cursor is on | and I press >, the > is inserted and the line gets indented properly:

<tag>
</tag>|

So far so good.

However, when I use omni-completion, it doesn't work. For example:

<tag>
    </|

If I now press <C-X><C-O><C-Y> to trigger omni-completion and accept the result, I end up with this:

<tag>
    </tag>|

How can I arrange that the line is properly and automatically indented? I'd prefer not to define any mappings, if possible.