thinktree/PHP-Xero — pull request #18 by bumperbox (2012-04-02 09:52:19+00:00)
Title: Xml for post data was invalid, Reference to undeclared entity 'Atilde'

When sending international characters this messages pops up "Xml for post data was invalid, Reference to undeclared entity 'Atilde'"

According to this Stackoverflow http://stackoverflow.com/questions/552957/, addChild() does not escape xml entities, whereas setting directly via $xml->$key does escape entities, removes the need to try and escape them ourselves first, as the current htmlentities() call doesn't do a good job of all xml entities

Also see this discussion
https://community.xero.com/developer/discussion/32311/