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make sure the “Autoclose” option is unchecked.

a la http://stackoverflow.com/questions/5992268/simplexml-how-to-correctly-set-encoding-and-xmins

if there is a standalone numerical index it will cause repetition of the “parent” element.

so that in order to make:

credentials/user and credentials/pass

so that

and indicate attributes with @. Numeric indexes by themselves will result in repetition of the parent element (ex. item/%i/sub could make <item><sub /></item><item><sub /></item>).

upload plugin folder to your plugins directory (/wp-content/plugins/)

for example you can add the following code via your theme functions.php

after any content that may be added via other plugins