Define XML structure from unknown XML document

HI all,

I am quite new on XML, is it possible when I load from any XML document, I can get the structure for the XML document, just like when I am trying to load from a CSV File, I will know how many fields I am looking at and so on, I am reading some XML documents, notice that when a field is null, the field just not appear on the document.

So how do I get the structure from the XML document?

Can anyone help?

Thanks

PlayKid