In the morning, I discussed about the research with Dr.Candan. I found that there is a gap between our idea about the definition of Null Values in the XML documents (NVX). According to him, we should try to find a formal model to represent the concept of NVX and show a light on the very definition. I attached to the specific features too much. For instance, I considered the difference between leaf nodes and non-leaf nodes in XML. It's not bad, but as Candan said, I jumped too far.
Furthermore, Candan and I exploits different way to consider this problem. Selcuk thinks we'd better employ a general way. Any XML document could be treated as a simple tree structure, and every conclusion for now is from such a structure. It's unnecessary to consider some specific features such as DTD etc. My methodology is just different from his. I believe, we should put everything into the environment of XML when defining the concept of NVX. There must be some sense to do with XML as far as NVX is defined.
Following with Selcuk's idea, we could get a simple model first of all, and might add more features step by step. It's not a bad idea. Mine could lead to a rather (might not so hard) complex model, with regard to the complexity of XML documents. I don't yet consider the difference mentioned above carefully, and I hope it's right, because I would follow Selcuk's way in future research.
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