validating files before uploading

[Liliths Thrall]

I'm creating a form to upload XML files to the server.

Is there anyway I can ensure that the XML file validates against a given XSD schema before the server tries to upload it and aborts if it doesn't validate?

Silverlight and Active X are not allowed.

[jj152]

This search gave some good examples
http://www.google.com/search?hl=en&s...+validate+xml+

[Liliths Thrall]

Let me rephrase my question because there seems to have been some misunderstanding.

Before the file is submitted to the server, I'd like it to be validated client-side.

I know how to validate the file once it gets server-side. I'm not asking a general question about how to validate XML, rather I'm asking how to do it specifically before upload to the web server.

Given that I identified that Silverlight and ActiveX aren't available and that JavaScript doesn't allow access to the client directory, validation will probably have to take place as part of the file upload process if it is to take place before the file finishes loading on the web server. Is there a way to do that?