intellij-sdk-code-samples/simple_language_plugin/testData/AnnotatorTestData.java

public class Test {
    public static void main(String[] args) {
        System.out.println("simple:website");
        System.out.println("simple:key with spaces");
        System.out.println("simple:<error descr="Unresolved property">websit"</error>);
    }
}