You need a namespace declaration

SET @AppName = @myDoc.value('declare default element namespace "urn:schemas-microsoft-com:asm.v1";

(/assembly/assemblyidentity/@Appname)[1]', 'char(150)' )

SELECT @AppName

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Deja View - The strange feeling that somewhere, sometime you've optimised this query before

How to get the best help on a forum

http://www.sqlservercentral.com/articles/Best+Practices/61537