private static String getServices(boolean isGlobal) {
        return "<services version='1.0'>" +
                "  <content id='default' version='1.0'>" +
                "    <redundancy>1</redundancy>" +
                "    <documents>" +
                "      <document type='music' mode='index' global='" +
                isGlobal + "'/>" +
                "    </documents>" +
                "    <nodes count='1'/>" +
                "   </content>" +
                "</services>";
    }
Test that global attribute changes are detected by change validator.
config-model/src/test/java/com/yahoo/vespa/model/application/validation/change/GlobalDocumentChangeValidatorTest.java