diff --git a/src/main/java/liquibase/nosql/changelog/AbstractNoSqlItemToDocumentConverter.java b/src/main/java/liquibase/nosql/changelog/AbstractNoSqlItemToDocumentConverter.java
index 0d055025..da9e54ae 100644
--- a/src/main/java/liquibase/nosql/changelog/AbstractNoSqlItemToDocumentConverter.java
+++ b/src/main/java/liquibase/nosql/changelog/AbstractNoSqlItemToDocumentConverter.java
@@ -5,10 +5,15 @@
 
 import java.util.Collection;
 
-import static liquibase.sqlgenerator.core.MarkChangeSetRanGenerator.*;
 
 public abstract class AbstractNoSqlItemToDocumentConverter<I, D>  {
 
+    public static final String AND = " AND ";
+    public static final String COMMA = ",";
+    public static final String WHITESPACE = " ";
+    public static final String OPEN_BRACKET = "(";
+    public static final String CLOSE_BRACKET = ")";
+
     public abstract D toDocument(I item);
 
     public abstract I fromDocument(D document);