importing XML file to create/update nodes, relation nodes/users, and taxonomy terms (to several vocabularies) Thanks for take time to read this question.

I want to import a XML file. XML content will create/update: nodes, relations nodes/users, and taxonomy terms (to several vocabularies) and his relation with nodes. I want to know, if is possible, your experiences and suggestions about this kind of requirements, or modules to resolve this, or if is best a custom code.

thanks in advance.
The migrate and migrate extras modules are your best friend for this (for Drupal 6 and 7).

The downside is all configuration is done in PHP Classes so you must have a reasonable amount of knowledge about them.

The upside is the documentation. The migrate module comes with an excellent example module that has examples for importing taxonomy, users, nodes + comments, files and roles from a SQL database and XML (it can also import from CSV, JSON and more but is not part of example module)

If you're looking for a nice UI to handle all this, migrate is not for you. You won't find anything else as flexible and full featured though.