In pseudocode, what you're probably looking for is

for $dirresult (result of '//ncp_directory' wrt $document) {
    for $fileresult (result of 'ncp_file' wrt $dirresult) {
        print(
            (result of '@md5' wrt $fileresult),
            ' = ',
            (result of '@name' wrt $fileresult)
        );
    }
}
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