diff --git a/datastructures-api/src/main/java/org/xbib/datastructures/api/Builder.java b/datastructures-api/src/main/java/org/xbib/datastructures/api/Builder.java
index 9eac9e6..c1f3d8c 100644
--- a/datastructures-api/src/main/java/org/xbib/datastructures/api/Builder.java
+++ b/datastructures-api/src/main/java/org/xbib/datastructures/api/Builder.java
@@ -58,5 +58,7 @@ public interface Builder {
 
     Builder copy(Builder builder) throws IOException;
 
+    Builder copy(String string) throws IOException;
+
     String build();
 }
diff --git a/datastructures-json-tiny/src/main/java/org/xbib/datastructures/json/tiny/JsonBuilder.java b/datastructures-json-tiny/src/main/java/org/xbib/datastructures/json/tiny/JsonBuilder.java
index 7327479..b4b7cda 100644
--- a/datastructures-json-tiny/src/main/java/org/xbib/datastructures/json/tiny/JsonBuilder.java
+++ b/datastructures-json-tiny/src/main/java/org/xbib/datastructures/json/tiny/JsonBuilder.java
@@ -182,6 +182,15 @@ public class JsonBuilder implements Builder {
         return this;
     }
 
+    @Override
+    public Builder copy(String string) throws IOException {
+        if (state.structure == Structure.COLLECTION) {
+            beginArrayValue();
+        }
+        appendable.append(string);
+        return this;
+    }
+
     @Override
     public String build() {
         return appendable.toString();
diff --git a/datastructures-xml/src/main/java/org/xbib/datastructures/xml/XMLBuilder.java b/datastructures-xml/src/main/java/org/xbib/datastructures/xml/XMLBuilder.java
index 8232183..44c55df 100644
--- a/datastructures-xml/src/main/java/org/xbib/datastructures/xml/XMLBuilder.java
+++ b/datastructures-xml/src/main/java/org/xbib/datastructures/xml/XMLBuilder.java
@@ -305,6 +305,12 @@ public class XMLBuilder implements Builder {
         return this;
     }
 
+    @Override
+    public Builder copy(String string) throws IOException {
+        appendable.append(string);
+        return this;
+    }
+
     @Override
     public String build() {
         return appendable.toString();
diff --git a/datastructures-yaml-tiny/src/main/java/org/xbib/datastructures/yaml/tiny/YamlBuilder.java b/datastructures-yaml-tiny/src/main/java/org/xbib/datastructures/yaml/tiny/YamlBuilder.java
index cc6eefe..ebc8abe 100644
--- a/datastructures-yaml-tiny/src/main/java/org/xbib/datastructures/yaml/tiny/YamlBuilder.java
+++ b/datastructures-yaml-tiny/src/main/java/org/xbib/datastructures/yaml/tiny/YamlBuilder.java
@@ -175,6 +175,12 @@ public class YamlBuilder implements Builder {
         return this;
     }
 
+    @Override
+    public Builder copy(String string) throws IOException {
+        buildValue(string);
+        return this;
+    }
+
     @Override
     public String build() {
         return appendable.toString();