diff --git a/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollection.java b/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollection.java
index 2e557b4..ea35a63 100644
--- a/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollection.java
+++ b/src/test/java/de/ids_mannheim/korap/filter/TestKorapCollection.java
@@ -52,6 +52,13 @@
 	assertEquals("Sentences", 75, kc.numberOf("sentences"));
 	assertEquals("Paragraphs", 48, kc.numberOf("paragraphs"));
 
+	kc.filter(kf.and("corpusID", "WPD"));
+
+	assertEquals("Documents", 1, kc.numberOf("documents"));
+	assertEquals("Tokens", 405, kc.numberOf("tokens"));
+	assertEquals("Sentences", 75, kc.numberOf("sentences"));
+	assertEquals("Paragraphs", 48, kc.numberOf("paragraphs"));
+
 	// Create a query
 	KorapQuery kq = new KorapQuery("tokens");
 	SpanQuery query = kq.seg("opennlp/p:NN").with("tt/p:NN").toQuery();
@@ -67,7 +74,55 @@
 	assertEquals("Tokens", 1669, kc.numberOf("tokens"));
 	assertEquals("Sentences", 188, kc.numberOf("sentences"));
 	assertEquals("Paragraphs", 130, kc.numberOf("paragraphs"));
-	System.err.println(kr.toJSON());
+	// System.err.println(kr.toJSON());
+    };
+
+
+    @Test
+    public void filterExample2 () throws IOException {
+	
+	// Construct index
+	KorapIndex ki = new KorapIndex();
+	FieldDocument fd;
+	// Indexing test files
+	for (String i : new String[] {"00001", "00002", "00003", "00004", "00005", "00006", "02439"}) {
+	    fd = ki.addDocFile(
+	      getClass().getResource("/wiki/" + i + ".json.gz").getFile(), true
+            );
+	};
+	ki.commit();
+
+	fd = ki.addDocFile(getClass().getResource("/wiki/AUG-55286.json.gz").getFile(), true);
+
+	ki.commit();
+
+	KorapFilter kf = new KorapFilter();
+
+	// Create Virtual collections:
+	KorapCollection kc = new KorapCollection(ki);
+	kc.filter( kf.and("textClass", "reisen").and("textClass", "freizeit-unterhaltung") );
+	assertEquals("Documents", 6, kc.numberOf("documents"));
+	assertEquals("Tokens", 2089, kc.numberOf("tokens"));
+	assertEquals("Sentences", 234, kc.numberOf("sentences"));
+	assertEquals("Paragraphs", 141, kc.numberOf("paragraphs"));
+
+	kc.filter( kf.and("corpusID", "A00") );
+
+	assertEquals("Documents", 1, kc.numberOf("documents"));
+	assertEquals("Tokens", 411, kc.numberOf("tokens"));
+	assertEquals("Sentences", 40, kc.numberOf("sentences"));
+	assertEquals("Paragraphs", 2, kc.numberOf("paragraphs"));
+
+	//	assertEquals("Documents", 1, kc.numberOf("documents"));
+
+	// Create a query
+	KorapQuery kq = new KorapQuery("tokens");
+	SpanQuery query = kq.seg("opennlp/p:NN").with("tt/p:NN").toQuery();
+
+	KorapResult kr = kc.search(query);
+
+	assertEquals(87, kr.totalResults());
+	// System.out.println(kr.toJSON());
     };
 };
 
diff --git a/src/test/java/de/ids_mannheim/korap/index/TestRealIndex.java b/src/test/java/de/ids_mannheim/korap/index/TestRealIndex.java
new file mode 100644
index 0000000..f7fcac1
--- /dev/null
+++ b/src/test/java/de/ids_mannheim/korap/index/TestRealIndex.java
@@ -0,0 +1,74 @@
+import java.util.*;
+import java.io.*;
+
+import de.ids_mannheim.korap.KorapIndex;
+import de.ids_mannheim.korap.index.FieldDocument;
+import de.ids_mannheim.korap.KorapCollection;
+import de.ids_mannheim.korap.KorapFilter;
+import de.ids_mannheim.korap.KorapResult;
+import de.ids_mannheim.korap.KorapQuery;
+import org.apache.lucene.store.MMapDirectory;
+import de.ids_mannheim.korap.filter.BooleanFilter;
+import org.apache.lucene.search.spans.SpanQuery;
+
+import static org.junit.Assert.*;
+import org.junit.Test;
+import org.junit.Ignore;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class TestRealIndex {
+
+    @Test
+    public void realExample1 () throws IOException {
+
+	// Load configuration file
+	Properties prop = new Properties();
+	FileReader fr = new FileReader(getClass().getResource("/korap.conf").getFile());
+	prop.load(fr);
+
+	// Check if the configuration was loaded fine
+	assertEquals(prop.getProperty("lucene.properties"), "true");
+
+	String indexDir = prop.getProperty("lucene.index");
+
+	// Get the real index
+	KorapIndex ki = new KorapIndex(new MMapDirectory(new File(indexDir)));
+
+	// Create a container for virtual collections:
+	KorapCollection kc = new KorapCollection(ki);
+
+	// Construct filter generator
+	KorapFilter kf = new KorapFilter();
+
+	// The virtual collection consists of all documents that have
+	// the textClasses "reisen" and "freizeit"
+	//	kc.filter( kf.and("textClass", "reisen").and("textClass", "freizeit-unterhaltung") );
+
+	// This is real slow atm - sorry
+	kc.filter(kf.and("textClass", "kultur"));
+	// kc.filter(kf.and("ID", "A00_JAN.02873"));
+
+
+	// Create a query
+	KorapQuery kq = new KorapQuery("tokens");
+
+	SpanQuery query =
+	    kq.within(
+              kq.tag("xip/const:NPA"),
+              kq._(1,
+                kq.seq(
+	          kq._(2, kq.seg("cnx/p:A").with("mate/m:number:sg"))
+                ).append(
+  		  kq.seg("opennlp/p:NN").with("tt/p:NN")
+	        )
+	      )
+            ).toQuery();
+
+
+	KorapResult kr = kc.search(query);
+
+	System.err.println(kr.toJSON());
+    };
+};
\ No newline at end of file
diff --git a/src/test/resources/korap.conf b/src/test/resources/korap.conf
new file mode 100644
index 0000000..555b1a8
--- /dev/null
+++ b/src/test/resources/korap.conf
@@ -0,0 +1,5 @@
+# Lucene Backend properties
+lucene.properties = true
+lucene.index = /home/ndiewald/Repositories/korap/KorAP-modules/KorAP-lucene-index/sandbox/index
+lucene.index.commit.count = 5000
+lucene.index.commit.log = log/korap.commit.log
\ No newline at end of file
diff --git a/src/test/resources/queries/bsp1.json b/src/test/resources/queries/bsp1.json
new file mode 100644
index 0000000..4085309
--- /dev/null
+++ b/src/test/resources/queries/bsp1.json
@@ -0,0 +1,76 @@
+{
+   "@context":{
+      "korap":"http://korap.ids-mannheim.de/ns/query",
+      "@language":"de",
+      "operands":{
+         "@id":"korap:operands",
+         "@container":"@list"
+      },
+      "relation":{
+         "@id":"korap:relation",
+         "@type":"korap:relation#types"
+      },
+      "class":{
+         "@id":"korap:class",
+         "@type":"xsd:integer"
+      },
+      "query":"korap:query",
+      "filter":"korap:filter",
+      "meta":"korap:meta"
+   },
+   "query":{
+      "@type":"korap:group",
+      "relation":"or",
+      "operands":[
+         {
+            "@type":"korap:token",
+            "@value":{
+               "@type":"korap:term",
+               "@value":"base:foo",
+               "relation":"="
+            }
+         },
+         {
+            "@type":"korap:sequence",
+            "operands":[
+               {
+                  "@type":"korap:token",
+                  "@value":{
+                     "@type":"korap:term",
+                     "@value":"base:foo",
+                     "relation":"="
+                  }
+               },
+               {
+                  "@type":"korap:token",
+                  "@value":{
+                     "@type":"korap:term",
+                     "@value":"base:bar",
+                     "relation":"="
+                  },
+                  "repetition":"*"
+               }
+            ]
+         }
+      ]
+   },
+   "meta":{
+      "@type":"korap:meta",
+      "@value":{
+         "@type":"korap:group",
+         "operands":[
+            {
+               "@type":"korap:term",
+               "@value":"author:Goethe",
+               "relation":"="
+            },
+            {
+               "@type":"korap:term",
+               "@value":"year:1815",
+               "relation":"="
+            }
+         ],
+         "relation":"and"
+      }
+   }
+}
diff --git a/src/test/resources/queries/bsp2.json b/src/test/resources/queries/bsp2.json
new file mode 100644
index 0000000..f97a4fd
--- /dev/null
+++ b/src/test/resources/queries/bsp2.json
@@ -0,0 +1,56 @@
+{
+   "@context":{
+      "korap":"http://korap.ids-mannheim.de/ns/query",
+      "@language":"de",
+      "operands":{
+         "@id":"korap:operands",
+         "@container":"@list"
+      },
+      "relation":{
+         "@id":"korap:relation",
+         "@type":"korap:relation#types"
+      },
+      "class":{
+         "@id":"korap:class",
+         "@type":"xsd:integer"
+      },
+      "query":"korap:query",
+      "filter":"korap:filter",
+      "meta":"korap:meta"
+   },
+   "query":{
+      "@type":"korap:sequence",
+      "operands":[
+         {
+            "@type":"korap:group",
+            "relation":"or",
+            "operands":[
+               {
+                  "@type":"korap:token",
+                  "@value":{
+                     "@type":"korap:term",
+                     "@value":"base:foo",
+                     "relation":"="
+                  }
+               },
+               {
+                  "@type":"korap:token",
+                  "@value":{
+                     "@type":"korap:term",
+                     "@value":"base:bar",
+                     "relation":"="
+                  }
+               }
+            ]
+         },
+         {
+            "@type":"korap:token",
+            "@value":{
+               "@type":"korap:term",
+               "@value":"base:foobar",
+               "relation":"="
+            }
+         }
+      ]
+   }
+}
diff --git a/src/test/resources/queries/bsp3.json b/src/test/resources/queries/bsp3.json
new file mode 100644
index 0000000..10a9f21
--- /dev/null
+++ b/src/test/resources/queries/bsp3.json
@@ -0,0 +1,41 @@
+{
+   "@context":{
+      "korap":"http://korap.ids-mannheim.de/ns/query",
+      "@language":"de",
+      "operands":{
+         "@id":"korap:operands",
+         "@container":"@list"
+      },
+      "relation":{
+         "@id":"korap:relation",
+         "@type":"korap:relation#types"
+      },
+      "class":{
+         "@id":"korap:class",
+         "@type":"xsd:integer"
+      },
+      "query":"korap:query",
+      "filter":"korap:filter",
+      "meta":"korap:meta"
+   },
+   "query":{
+      "@type":"korap:sequence",
+      "shrink":"0",
+      "operands":[
+         {
+            "@type":"korap:group",
+            "class":"0",
+            "operands":[
+               {
+                  "@type":"korap:token",
+                  "@value":{
+                     "@type":"korap:term",
+                     "@value":"base:foo",
+                     "relation":"="
+                  }
+               }
+            ]
+         }
+      ]
+   }
+}
diff --git a/src/test/resources/queries/bsp4.json b/src/test/resources/queries/bsp4.json
new file mode 100644
index 0000000..e98afbd
--- /dev/null
+++ b/src/test/resources/queries/bsp4.json
@@ -0,0 +1,49 @@
+{
+   "@context":{
+      "korap":"http://korap.ids-mannheim.de/ns/query",
+      "@language":"de",
+      "operands":{
+         "@id":"korap:operands",
+         "@container":"@list"
+      },
+      "relation":{
+         "@id":"korap:relation",
+         "@type":"korap:relation#types"
+      },
+      "class":{
+         "@id":"korap:class",
+         "@type":"xsd:integer"
+      },
+      "query":"korap:query",
+      "filter":"korap:filter",
+      "meta":"korap:meta"
+   },
+   "query":{
+      "@type":"korap:sequence",
+      "shrink":"0",
+      "operands":[
+         {
+            "@type":"korap:group",
+            "class":"0",
+            "operands":[
+               {
+                  "@type":"korap:token",
+                  "@value":{
+                     "@type":"korap:term",
+                     "@value":"base:foo",
+                     "relation":"="
+                  }
+               }
+            ]
+         },
+         {
+            "@type":"korap:token",
+            "@value":{
+               "@type":"korap:term",
+               "@value":"orth:bar",
+               "relation":"="
+            }
+         }
+      ]
+   }
+}
diff --git a/src/test/resources/queries/bsp5.json b/src/test/resources/queries/bsp5.json
new file mode 100644
index 0000000..246df1e
--- /dev/null
+++ b/src/test/resources/queries/bsp5.json
@@ -0,0 +1,49 @@
+{
+   "@context":{
+      "korap":"http://korap.ids-mannheim.de/ns/query",
+      "@language":"de",
+      "operands":{
+         "@id":"korap:operands",
+         "@container":"@list"
+      },
+      "relation":{
+         "@id":"korap:relation",
+         "@type":"korap:relation#types"
+      },
+      "class":{
+         "@id":"korap:class",
+         "@type":"xsd:integer"
+      },
+      "query":"korap:query",
+      "filter":"korap:filter",
+      "meta":"korap:meta"
+   },
+   "query":{
+      "@type":"korap:sequence",
+      "shrink":"1",
+      "operands":[
+         {
+            "@type":"korap:token",
+            "@value":{
+               "@type":"korap:term",
+               "@value":"base:Der",
+               "relation":"="
+            }
+         },
+         {
+            "@type":"korap:group",
+            "class":"1",
+            "operands":[
+               {
+                  "@type":"korap:token",
+                  "@value":{
+                     "@type":"korap:term",
+                     "@value":"base:Mann",
+                     "relation":"="
+                  }
+               }
+            ]
+         }
+      ]
+   }
+}
diff --git a/src/test/resources/queries/readme.txt b/src/test/resources/queries/readme.txt
new file mode 100644
index 0000000..b82454f
--- /dev/null
+++ b/src/test/resources/queries/readme.txt
@@ -0,0 +1,5 @@
+bsp1.json: [base=foo]|([base=foo][base=bar])* meta author=Goethe&year=1815
+bsp2.json: ([base=foo]|[base=bar])[base=foobar]
+bsp3.json: shrink({[base=Mann]})
+bsp4.json: shrink({[base=foo]}[orth=bar])
+bsp5.json: shrink(1:[base=Der]{1:[base=Mann]})