Assuring quality IT solutions demands assuring quality in all aspects of software development process. For this we need well-formed methods with suitable metrics with which we can verify if a process, software product, software component, software artifact or other part of possible solution meets defined quality characteristics. XML Schemas and corresponding XML documents are becoming the most important software artifacts. Today we can find large number of software metrics which are mostly used for software products. Very little has been done in field of metrics for XML Schema specification, especially metrics for evaluating XML Schemas quality. In this paper we will analyze existing XML metrics and their usage and try to hand out preliminary proposal for XML Schema quality framework.