diff --git a/src/org/opentdk/api/datastorage/JSONDataContainer.java b/src/org/opentdk/api/datastorage/JSONDataContainer.java
index a62f935..2f5d04c 100644
--- a/src/org/opentdk/api/datastorage/JSONDataContainer.java
+++ b/src/org/opentdk/api/datastorage/JSONDataContainer.java
@@ -58,7 +58,7 @@ public class JSONDataContainer implements SpecificContainer {
 
 	/**
 	 * Container object for the JSON data. Supports several read and write methods. Gets initialized in
-	 * {@link #readData(Filter)}.
+	 * {@link #readData(File)}.
 	 */
 	private JSONObject json;
 	
@@ -126,19 +126,6 @@ public void readData(File srcFile) throws IOException {
 		} 	
 	}
 	
-
-	@Override
-	public void readData(File sourceFile, Filter filter) throws IOException {
-		// TODO Auto-generated method stub
-		
-	}
-
-	@Override
-	public void readData(InputStream stream, Filter filter) throws IOException {
-		// TODO Auto-generated method stub
-		
-	}
-	
 	@Override
 	public void writeData(File srcFile) throws IOException {
 		if (json == null || json.isEmpty()) {
diff --git a/src/org/opentdk/api/datastorage/SpecificContainer.java b/src/org/opentdk/api/datastorage/SpecificContainer.java
index deddceb..cda06db 100644
--- a/src/org/opentdk/api/datastorage/SpecificContainer.java
+++ b/src/org/opentdk/api/datastorage/SpecificContainer.java
@@ -69,9 +69,29 @@ default String asString(EContainerFormat exportAs) {
 	 * @throws IOException if the reading failed the user can handle the cause
 	 */
 	void readData(File sourceFile) throws IOException;
-	void readData(File sourceFile, Filter filter) throws IOException;
+
+	/**
+	 * Calls {@link #readData(File)}. The filter is not supported by default.
+	 */
+	default void readData(File sourceFile, Filter filter) throws IOException {
+		readData(sourceFile);
+	}
+
+	/**
+	 * Each specific container needs to implement a method that reads data from a
+	 * stream.
+	 *
+	 * @param stream Stream object with the content
+	 * @throws IOException if the reading failed the user can handle the cause
+	 */
 	void readData(InputStream stream) throws IOException;
-	void readData(InputStream stream, Filter filter) throws IOException;
+
+	/**
+	 * Calls {@link #readData(InputStream)}. The filter is not supported by default.
+	 */
+	default void readData(InputStream stream, Filter filter) throws IOException {
+		readData(stream);
+	}
 
 	/**
 	 * Each specific container has to implement a method that writes the
diff --git a/src/org/opentdk/api/datastorage/TabularContainer.java b/src/org/opentdk/api/datastorage/TabularContainer.java
index 48baa51..89c3daf 100644
--- a/src/org/opentdk/api/datastorage/TabularContainer.java
+++ b/src/org/opentdk/api/datastorage/TabularContainer.java
@@ -37,12 +37,11 @@
 import org.json.JSONArray;
 import org.json.JSONObject;
 
-import java.io.File;
-import java.io.IOException;
-import java.io.InputStream;
+import java.io.*;
 import java.util.*;
 import java.util.logging.Level;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 public class TabularContainer implements SpecificContainer {
 
@@ -195,7 +194,7 @@ public JSONObject toJson() {
 	}
 
 	@Override
-	public void readData(File sourceFile) throws IOException {
+	public void readData(File sourceFile) {
 		if (sourceFile != null && sourceFile.exists()) {
 			if (StringUtils.isNotBlank(sourceFile.getPath())) {
 				putFile(sourceFile.getPath(), getColumnDelimiter());
@@ -326,18 +325,26 @@ private void putDatasetRows(String fileName, String columnDelimiter) {
 	}
 
 	@Override
-	public void readData(File sourceFile, Filter filter) throws IOException {
-		// TODO Auto-generated method stub		
-	}
-
-	@Override
-	public void readData(InputStream stream) throws IOException {
-		// TODO Auto-generated method stub	
-	}
-
-	@Override
-	public void readData(InputStream stream, Filter filter) throws IOException {
-		// TODO Auto-generated method stub		
+	public void readData(InputStream stream) {
+		String content = null;
+		if (stream != null) {
+			InputStreamReader inputStreamReader = new InputStreamReader(stream);
+			Stream<String> streamOfString = new BufferedReader(inputStreamReader).lines();
+			content = streamOfString.collect(Collectors.joining());
+
+			streamOfString.close();
+			try {
+				inputStreamReader.close();
+			} catch (IOException e) {
+				MLogger.getInstance().log(Level.SEVERE, e);
+			}
+		}
+		if(content != null) {
+			// Store content in a temporary file to use the existing methods to add to the values object
+			String file = "~tmp/" + getClass().getSimpleName() + ".csv";
+			FileUtil.writeOutputFile(content, file);
+			putFile(file, columnDelimiter);
+		}
 	}
 
 	@Override
diff --git a/src/org/opentdk/api/datastorage/XMLDataContainer.java b/src/org/opentdk/api/datastorage/XMLDataContainer.java
index 007a287..295381d 100644
--- a/src/org/opentdk/api/datastorage/XMLDataContainer.java
+++ b/src/org/opentdk/api/datastorage/XMLDataContainer.java
@@ -132,22 +132,6 @@ public void readData(InputStream stream) throws IOException {
 		rootNode = xEdit.getRootNodeName();
 	}
 
-	/**
-	 * Calls {@link #readData(File)}. The filter is not supported.
-	 */
-	@Override
-	public void readData(File sourceFile, Filter filter) throws IOException {
-		readData(sourceFile);
-	}
-
-	/**
-	 * Calls {@link #readData(InputStream)}. The filter is not supported.
-	 */
-	@Override
-	public void readData(InputStream stream, Filter filter) throws IOException {
-		readData(stream);
-	}
-
 	@Override
 	public void writeData(File outputFile) {
 		xEdit.save(outputFile);
diff --git a/src/org/opentdk/api/datastorage/YAMLDataContainer.java b/src/org/opentdk/api/datastorage/YAMLDataContainer.java
index 1336411..38abd6e 100644
--- a/src/org/opentdk/api/datastorage/YAMLDataContainer.java
+++ b/src/org/opentdk/api/datastorage/YAMLDataContainer.java
@@ -112,25 +112,14 @@ public void readData(InputStream stream) throws IOException {
 			json.setJsonWithMap(content);
 		}
 	}
-	
-
-	@Override
-	public void readData(File sourceFile, Filter filter) throws IOException {
-		// TODO Auto-generated method stub
-		
-	}
-
-	@Override
-	public void readData(InputStream stream, Filter filter) throws IOException {
-		// TODO Auto-generated method stub
-		
-	}
 
 	@Override
 	public void writeData(File outputFile) throws IOException {
 		yaml.dump(yaml.dumpAsMap(json.getJsonAsMap()), new FileWriter(outputFile.getPath()));	
 	}
 
+	// The following methods just link to the JSONDataContainer
+
 	public void add(String name, String value) {
 		json.add(name, value);
 	}
diff --git a/src/org/opentdk/api/io/XMLEditor.java b/src/org/opentdk/api/io/XMLEditor.java
index 43ce2f2..3e7867e 100644
--- a/src/org/opentdk/api/io/XMLEditor.java
+++ b/src/org/opentdk/api/io/XMLEditor.java
@@ -1057,7 +1057,7 @@ public String asString(Node node, boolean skipHeader) {
 				transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
 			}
 
-			removeEmptySpace(rootElement);
+			removeEmptySpace(node);
 
 			// Transform the node to a string
 			DOMSource source = new DOMSource(node);