Techniques for providing and using schema data for markup languages are disclosed. A schema model can be used to generate signed (or verifiable) schema data (e.g., XML schema data). The model can be used as a standard model that provides enhanced security and better performance. As a result, schema data can be verified more efficiently. A base class for XML schema data is provided. The base class can be instantiated to generate an XML schema file (or document). A digital signature can then be applied to the XML schema file to generate a signed XML schema file (or document). Furthermore, the resolution of data can be achieved more efficiently for markup languages because the resolution of data can be achieved systematically. In addition, techniques for storing and using signed schema data for markup languages are disclosed. An XML library can be used to store XML schema data that has been verified (or authenticated).