Application made with Mono 2.0, compatible with .Net Framework 2.0. It allows to load and modify xml, xsd and xsl docs and perform theirs validation, also using an embedded browser. Also, it allows to apply xsl to xml and to validate xml with xsd.
This would be a good tool, however, when validating xml against an xsd, I get a message: "Error - The element cannot contain text. Content model is empty". But it does not tell me anywhere what Node or Element has the error. I finally found which node by manually figuring it out. This tool should always show what node/element the error occurred on, but it doesn't. I forced other errors too, and many errors do not tell you what node the error occurred on. For example, add any attribute to an element, that isn't allowed in the xsd, and you get an error, but it does not tell you what Node/Element the error is in. Otherwise, this looks like it would be a good tool.