diff --git a/src/fr/devinsy/sikevadb/core/XMLSikevaDB.java b/src/fr/devinsy/sikevadb/core/XMLSikevaDB.java
index 399f46f..cf5493f 100644
--- a/src/fr/devinsy/sikevadb/core/XMLSikevaDB.java
+++ b/src/fr/devinsy/sikevadb/core/XMLSikevaDB.java
@@ -19,6 +19,7 @@
 package fr.devinsy.sikevadb.core;
 
 import java.io.File;
+import java.io.IOException;
 import java.io.OutputStream;
 
 import javax.xml.stream.XMLStreamException;
@@ -45,17 +46,16 @@ public class XMLSikevaDB
 	private static final Logger logger = LoggerFactory.getLogger(XMLSikevaDB.class);
 
 	/**
-	 * Saves a net in a file.
-	 * 
+	 * Export.
+	 *
 	 * @param out
 	 *            the out
 	 * @param source
-	 *            Source.
-	 * 
-	 * @throws Exception
-	 *             the exception
+	 *            the source
+	 * @throws SikevaDBException
+	 *             the sikeva DB exception
 	 */
-	public static void export(final OutputStream out, final SikevaDB source) throws Exception
+	public static void export(final OutputStream out, final SikevaDB source) throws SikevaDBException
 	{
 		//
 		String fileName = "sikevadb-" + DateTime.now().toString("yyyy-MM-dd-HH'h'mm'mn'ss's'") + ".xml.zip";
@@ -65,19 +65,18 @@ public class XMLSikevaDB
 	}
 
 	/**
-	 * Saves a net in a file.
-	 * 
+	 * Export.
+	 *
 	 * @param out
 	 *            the out
 	 * @param source
-	 *            Source.
+	 *            the source
 	 * @param fileName
 	 *            the file name
-	 * 
-	 * @throws Exception
-	 *             the exception
+	 * @throws SikevaDBException
+	 *             the sikeva DB exception
 	 */
-	public static void export(final OutputStream out, final SikevaDB source, final String fileName) throws Exception
+	public static void export(final OutputStream out, final SikevaDB source, final String fileName) throws SikevaDBException
 	{
 		if (out == null)
 		{
@@ -105,11 +104,22 @@ public class XMLSikevaDB
 				//
 				write(target, source);
 			}
+			catch (IOException exception)
+			{
+				throw new SikevaDBException("Problem writing element.", exception);
+			}
 			finally
 			{
 				if (target != null)
 				{
-					target.close();
+					try
+					{
+						target.close();
+					}
+					catch (IOException exception)
+					{
+						logger.warn("Problem closing stream.", exception);
+					}
 				}
 			}
 		}
@@ -126,7 +136,7 @@ public class XMLSikevaDB
 	 * @throws Exception
 	 *             the exception
 	 */
-	public static void importData(final SikevaDB database, final File file) throws Exception
+	public static void importData(final SikevaDB database, final File file)
 	{
 		// XMLReader in = null;
 		// try {
@@ -145,58 +155,65 @@ public class XMLSikevaDB
 	 * @param in
 	 *            the in
 	 * @return the element
-	 * 
-	 * @throws XMLStreamException
-	 *             the XML stream exception
-	 * @throws XMLBadFormatException
-	 *             the XML bad format exception
+	 * @throws SikevaDBException
 	 */
-	public static Element readElement(final XMLReader in) throws XMLStreamException, XMLBadFormatException
+	public static Element readElement(final XMLReader in) throws SikevaDBException
 	{
 		Element result;
 
-		//
-		XMLTag tag = in.readStartTag("element");
-
-		//
+		try
 		{
 			//
-			long id = Long.parseLong(tag.attributes().getByLabel("id").getValue());
-			String key = StringEscapeUtils.unescapeXml(in.readContentTag("key").getContent());
-			String subkey = StringEscapeUtils.unescapeXml(in.readNullableContentTag("subkey").getContent());
-			String value = StringEscapeUtils.unescapeXml(in.readContentTag("value").getContent());
-			int size = Integer.parseInt(tag.attributes().getByLabel("size").getValue());
-			String digest = in.readContentTag("digest").getContent();
-			DateTime creationDate = DateTime.parse(in.readContentTag("creation_date").getContent());
-			DateTime editionDate = DateTime.parse(in.readContentTag("edition_date").getContent());
+			XMLTag tag = in.readStartTag("element");
 
-			DateTime archiveDate;
-			String archiveDateValue = in.readNullableContentTag("archive_date").getContent();
-			if (archiveDateValue == null)
+			//
 			{
-				archiveDate = null;
-			}
-			else
-			{
-				archiveDate = DateTime.parse(archiveDateValue);
+				//
+				long id = Long.parseLong(tag.attributes().getByLabel("id").getValue());
+				String key = StringEscapeUtils.unescapeXml(in.readContentTag("key").getContent());
+				String subkey = StringEscapeUtils.unescapeXml(in.readNullableContentTag("subkey").getContent());
+				String value = StringEscapeUtils.unescapeXml(in.readContentTag("value").getContent());
+				int size = Integer.parseInt(tag.attributes().getByLabel("size").getValue());
+				String digest = in.readContentTag("digest").getContent();
+				DateTime creationDate = DateTime.parse(in.readContentTag("creation_date").getContent());
+				DateTime editionDate = DateTime.parse(in.readContentTag("edition_date").getContent());
+
+				DateTime archiveDate;
+				String archiveDateValue = in.readNullableContentTag("archive_date").getContent();
+				if (archiveDateValue == null)
+				{
+					archiveDate = null;
+				}
+				else
+				{
+					archiveDate = DateTime.parse(archiveDateValue);
+				}
+
+				//
+				result = new Element();
+
+				result.setId(id);
+				result.setKey(key);
+				result.setSubkey(subkey);
+				result.setValue(value);
+				result.setSize(size);
+				result.setDigest(digest);
+				result.setCreationDate(creationDate);
+				result.setEditionDate(editionDate);
+				result.setArchiveDate(archiveDate);
 			}
 
 			//
-			result = new Element();
-
-			result.setId(id);
-			result.setKey(key);
-			result.setSubkey(subkey);
-			result.setValue(value);
-			result.setSize(size);
-			result.setDigest(digest);
-			result.setCreationDate(creationDate);
-			result.setEditionDate(editionDate);
-			result.setArchiveDate(archiveDate);
+			in.readEndTag("element");
+		}
+		catch (XMLStreamException exception)
+		{
+			throw new SikevaDBException("Problem reading element.", exception);
+		}
+		catch (XMLBadFormatException exception)
+		{
+			throw new SikevaDBException("Problem reading element.", exception);
 		}
-
-		//
-		in.readEndTag("element");
 
 		//
 		return result;
@@ -209,30 +226,40 @@ public class XMLSikevaDB
 	 *            the target
 	 * @param in
 	 *            the in
+	 * @throws XMLBadFormatException
+	 * @throws XMLStreamException
+	 * @throws SikevaDBException
 	 * 
 	 * @throws Exception
 	 *             the exception
 	 */
-	public static void readElements(final SikevaDB target, final XMLReader in) throws Exception
+	public static void readElements(final SikevaDB target, final XMLReader in) throws SikevaDBException
 	{
-		//
-		XMLTag list = in.readListTag("elements");
-
-		//
-		if (list.getType() != TagType.EMPTY)
+		try
 		{
-			while (in.hasNextStartTag("element"))
-			{
-
-				//
-				Element element = readElement(in);
-
-				//
-				target.put(element);
-			}
+			XMLTag list = in.readListTag("elements");
 
 			//
-			in.readEndTag("elements");
+			if (list.getType() != TagType.EMPTY)
+			{
+				//
+				while (in.hasNextStartTag("element"))
+				{
+					Element element = readElement(in);
+					target.put(element);
+				}
+
+				//
+				in.readEndTag("elements");
+			}
+		}
+		catch (XMLStreamException exception)
+		{
+			throw new SikevaDBException("Problem reading element.", exception);
+		}
+		catch (XMLBadFormatException exception)
+		{
+			throw new SikevaDBException("Problem reading element.", exception);
 		}
 	}
 
@@ -300,11 +327,12 @@ public class XMLSikevaDB
 	 *            the out
 	 * @param source
 	 *            the source
+	 * @throws SikevaDBException
 	 * 
 	 * @throws Exception
 	 *             the exception
 	 */
-	public static void write(final XMLWriter out, final SikevaDB source) throws Exception
+	public static void write(final XMLWriter out, final SikevaDB source) throws SikevaDBException
 	{
 		if (out == null)
 		{