diff --git a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/CreateDatasetForm.java b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/CreateDatasetForm.java
index ec17a83..8b85659 100644
--- a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/CreateDatasetForm.java
+++ b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/CreateDatasetForm.java
@@ -72,7 +72,7 @@ import com.google.gwt.user.client.ui.Widget;
  * @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
  */
 public class CreateDatasetForm extends Composite{
-	
+
 	/**
 	 * Create a remote service proxy to talk to the server-side ckan service.
 	 */
@@ -152,7 +152,7 @@ public class CreateDatasetForm extends Composite{
 	@UiField Icon infoIconResources;
 	@UiField FocusPanel focusPanelResources;
 	@UiField Popover popoverResources;
-	
+
 	protected static final String ERROR_PRODUCT_CREATION = "There was an error while trying to publish your product, sorry.. Retry later";
 
 	// tab panel 
@@ -1139,21 +1139,28 @@ public class CreateDatasetForm extends Composite{
 	}
 
 	/**
-	 * Add the tag as an element
+	 * Add the tag as an element (inserted by the user)
 	 */
 	private void addTagElement(TextBox itemBox){
 
+		GWT.log("value is " + itemBox.getValue());
+
 		if (itemBox.getValue() != null && !"".equals(itemBox.getValue().trim())) {
 
-			if(tagsList.contains(itemBox.getValue()))
+			if(tagsList.contains(itemBox.getValue())){
+				itemBox.setValue("");
 				return;
+			}
 
 			// ckan accepts only alphanumeric values
-			if(!itemBox.getValue().matches("^[a-zA-Z0-9]*$"))
-				return;
-
-			if(itemBox.getValue().length() <= 1)
-				return;
+			String[] subTags = itemBox.getValue().split(" ");
+			for (int i = 0; i < subTags.length; i++) {
+				String subTag = subTags[i];
+				if(!subTag.matches("^[a-zA-Z0-9]*$"))
+					return;
+				if(subTag.length() <= 1)
+					return;
+			}
 
 			final String value = itemBox.getValue();
 			final ListItem displayItem = new ListItem();
@@ -1179,13 +1186,23 @@ public class CreateDatasetForm extends Composite{
 	}
 
 	/**
-	 * Add the tag as an element
+	 * Add the tag as an element (when publishing from workspace)
 	 */
 	private void addTagElement(final String tag){
 
 		if(tagsList.contains(tag))
 			return;
 
+		// ckan accepts only alphanumeric values
+		String[] subTags = tag.split(" ");
+		for (int i = 0; i < subTags.length; i++) {
+			String subTag = subTags[i];
+			if(!subTag.matches("^[a-zA-Z0-9]*$"))
+				return;
+			if(subTag.length() <= 1)
+				return;
+		}
+
 		final ListItem displayItem = new ListItem();
 		displayItem.setStyleName("tag-style");
 		Span p = new Span(tag);
diff --git a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/utils/InfoIconsLabels.java b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/utils/InfoIconsLabels.java
index 11f35d1..d082abd 100644
--- a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/utils/InfoIconsLabels.java
+++ b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/utils/InfoIconsLabels.java
@@ -9,7 +9,9 @@ public class InfoIconsLabels {
 	// TAGS
 	public static final String TAGS_INFO_ID_POPUP = "tags-popup-panel-info";
 	public static final String TAGS_INFO_CAPTION = "Tags";
-	public static final String TAGS_INFO_TEXT = "Tags are meaningful information that can be associated to the product and by means of them it can be retrieved. A tag cannot contain white spaces and can contain only alphanumeric characters. It must be at least of two characters.";
+	public static final String TAGS_INFO_TEXT = "Tags are meaningful information that can be associated to the "
+			+ "product and by means of them it can be retrieved. A tag can contain only alphanumeric characters. "
+			+ "Any string of the tag must be at least of two characters. Examples of good tags: \"This is my sample tag\", \"tagY\". Examples of bad tags: \"This is a tag\", \"c\".";
 
 	// VISIBILITY
 	public static final String VISIBILITY_INFO_ID_POPUP = "visibility-popup-panel-info";
diff --git a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/server/CKANPublisherServicesImpl.java b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/server/CKANPublisherServicesImpl.java
index f06de10..e9c9d8d 100644
--- a/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/server/CKANPublisherServicesImpl.java
+++ b/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/server/CKANPublisherServicesImpl.java
@@ -560,7 +560,7 @@ public class CKANPublisherServicesImpl extends RemoteServiceServlet implements C
 
 				}
 
-			String datasetId = utils.createCKanDataset(getUserCKanTokenFromSession(), null, title, organizationNameOrId,  author,
+			String datasetId = utils.createCKanDataset(getUserCKanTokenFromSession(), title, organizationNameOrId,  author,
 					authorMail,  maintainer,  maintainerMail,  version, description, licenseId,
 					listOfTags, customFields, resources, setPublic);