Do Xml Have "post" Like In Html??

I don't understand your question.

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in html they have:
<form method="post">

and can use $_POST from php.
do xml has this function?

The point of XML is that you design your own tags and attributes. If you want to use a post attribute in XML, you certainly can. PHP has built-in functions for XML parsing, so you can easily retrive the value of the post attribute that you define.

Here's the official documentation: http://us3.php.net/manual/en/ref.xml.php

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