XEntrant

XEntrant is a model driven XML editor supporting editing, browsing and validating of XML document instances (wellformed or predefined), DTDs (document type definitions), XML Schemas, XSL Transformations (Extensible Stylesheet Language). Simple and easy work with nodes and subtrees only, instead of with tags and complex structures in a text form. There is no need to remember syntax or structure of definitions. At any point in time while editing you can not only see definitions and types of edited nodes but you can drag and drop individual items from the definitions and instances into any location within the instance document allowed by another useful feature - prevalidation.

Limitations:

100-day trial