Updated SpanSubspanQuery for empty length.
diff --git a/src/test/resources/queries/submatch3.jsonld b/src/test/resources/queries/submatch3.jsonld
new file mode 100644
index 0000000..6363de6
--- /dev/null
+++ b/src/test/resources/queries/submatch3.jsonld
@@ -0,0 +1,29 @@
+{
+ "@context":"http://ids-mannheim.de/ns/KorAP/json-ld/v0.2/context.jsonld",
+ "errors":[
+
+ ],
+ "warnings":[
+
+ ],
+ "messages":[
+
+ ],
+ "collection":null,
+ "query":{
+ "@type" : "korap:reference",
+ "operands" : [
+ {
+ "@type" : "korap:span",
+ "key" : "s"
+ }
+ ],
+ "operation" : "operation:focus",
+ "spanRef" : [
+ 1
+ ]
+ },
+ "meta":{
+
+ }
+}