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Files with extension yaml should be detected as being yaml files. Actually only yml as extension seems to be working. Since yaml.org proposes yaml as file endings this should work.
Fixed Checking in src/org/netbeans/modules/languages/yaml/YAML.xml; /cvs/languages/yaml/src/org/netbeans/modules/languages/yaml/YAML.xml,v <-- YAML.xml new revision: 1.2; previous revision: 1.1 done