I want to validate xml file against xsd file (just to figure out how xsd works). Finally, use the first column to check which schema should be used for validation/intellisense In the properties window of the xml file in visual studio you can chose the xsd to validate against.
in fact, VS2010 is "smart" enough that even if you close and reopen the file, it'll remember the values you've set in the Properties window.
I've just started to learn xml, so i'm a beginner in this domain. Also be sure that there are not more references to the same schema.