Managing XML Documents in PHP

Hello, I am working with DOM XML in PHP, but is limited (or I do not
work very well).

Anyone know any class or collection of functions for PHP, that manage
things like this?

(/root/child[5]/@att , 'value')
-if no exist create it all elements empty and set att to value.
(/root/child[@id=1]/@att , 'value')
-select att in child where id attribute is 1 and set to value

The idea is work with XPath over DOM Object without apparent selection
of nodes.

(Sorry if this is offtopic)











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