public ApplicationBuilder rankExpression(String name, String rankExpressionContent) throws IOException {
        Path path = nestedResource(ApplicationPackage.SCHEMAS_DIR, name, ApplicationPackage.RANKEXPRESSION_NAME_SUFFIX);
        createFile(path, rankExpressionContent);
        return this;
    }
Builds an application package on disk and returns a path to the result.

@author Tony Vaagenes
application/src/main/java/com/yahoo/application/ApplicationBuilder.java