Look here for some introduction in XML data placing in InDesign:
As for your "old data" problem:
I suppose that you still load the old one. Look at the content in the XML file. XML files are text files, easy to understand. There should be no problem peeking around with a text editor.
Else: you need to post more data to get some decent help.
Thanks for your reply! I checked the xml and i can see that its a new version and different. But after importing and merging it loads but still gives me the old data. What kinda information do you need for you to help.
Your workflow with screenshots...
This is the file that im working with.
The elements tab is very long as you can see. I don't know if i should delete some elements.
And this is the xml file that im working with.
Also these are the best settings i found so far for the xml to get it into indesign:
I hope you can help me with this information. If you need anything else, just let me know!