How to specify in an XML schema that either one of two fields must be present?

Question

I want to specify that either fieldname or freetext must always be present in XML files that apply to this XSD. Is there a way to do that?

Answer 1

So, you want either fieldname or freetext and not both? or maybe both? and then dbtablename optionally?

Here is 1 or 2 of the elements:

Is this what you want? or did you want dbtablename to be separate?