Validating with xml schema
Add XML catalog entries for these schemas and you can see a more complex validation at work in this product label.Extensible Markup Language (XML) is used to describe data.Right-click on the file name again, select Validate, and the warning in the Problems pane should disappear and you'll see a pop-up telling you the validation completed with no errors or warnings (note that you can turn this pop-up off if you like by checking the "Do not show this dialog in future" box in the pop-up).
We're doing straightforward mappings, so select Catalog Entry from the top of the column of icons on the left.
Plus learning how to create and edit XML Catalog files will make your life easier in the long run if you're planning to do more than a little PDS4 label development.
Let's start by opening the collection_1.0file (double-click it or whatever).
The PDS4_PDS_0800k.xsd' file is the file containing the namespace definition that corresponds to the "/v08" test version.
The other schemas are there so you can try pointing to the wrong one to see what happens.