Yes, I am sure. (Although I tried all kinds of headers - no result.)

I tried Encode::decode and had negative result with and without it.

Its amazon's client. YouTube has (except the values) the exactly same opensearch file layout - I even tried copy and paste their content - and sent it to amazon A9. Result: Error: no valid XML header *in* file.

Their works: http://a9.com/-/opensearch/?url=http%3A%2F%2Fwww.youtube.com%2Fopensearch
What is the magic to properly identify an XML file...?

In reply to Re^2: Output of XML: "valid XML header needed"-error (OpenSearch)? by isync
in thread Output of XML: "valid XML header needed"-error (OpenSearch)? by isync

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