Significant applications using or built on top of XML and XSL(T); typically created using DTDs and XML schemas. Applications in this sense meaning that XML and or XSL(T) is used (applied) to carry out the required task. Applications (in the sense of tools) which assist with the development or deployment of XML are listed in the
Tools category. Resources such as directories or tutorials on creating DTDs to begin an XML application should be listed in
Document_Types category. Each application listed, which has multiple sites is given its own category below this one. Applications which have a single site describing them are listed in the appropriate topical category. The sites listed at this level are applications with only one listing, directory and guide sites which provide coverage for multiple applications.