Enhancements

• There are three new plug-in types available in this release called "import plug-ins", "export plug-ins", and "project plug-ins". The documentation for both of these types is available from the main plug-in documentation pages.
• Implemented support for the new "Project Plugin" type that allows a plugin author to manipulate projects and the Protege UI as they are created. Documentation for this plugin type is available on our Web site.
• Added the capability for one plug-in to declare itself "dependent" upon another. Updated the 2.1 plug-in documentation to explain how to do this.
• The Instances tab and the "Pick Instances" dialog now allow you to select between showing all instances or only direct instances when a class is selected.
• The URLWidget can now display image files.
• Added additional configuration options to the Graph Widget that allow users to control the snap-to-grid functionality on the canvas. The new options are accessible from the View Properties tab in the widget configuration dialog.
• Created the UniqueStringWidget for acquiring a unique value for a slot. The values are tested for uniqueness against all frames in the entire knowledge base.
• Added the ability to enter an arbitrary Unicode character into any text component by typing the four character hex code and then pressing the key combination "Alt-x".
• Subslots with more than one parent now are displayed with a trailing "M" icon in the slots tab.
• Included a script to run the protege server on Unix machines (run_protege_server.sh).
• Added a property to allow the protege.properties file to be stored in the users home directory (rather than the default of the application installation directory). The property can be specified in the LAX file as:
  
       protege.properties.in.user.home=true
  
  On the java command line, the property can be specified as:
  
       java -Dprotege.properties.in.user.home=true ...
• Added a method called getInstallationDirectory to PluginUtilities so that a plugin can now discover what directory it is installed in.
• Added a method to the PluginUtilities class to find classes with particular attributes and values.
• Tabs can now have an "isSuitable" static method with a signature boolean isSuitable(Project p, Collection errors). If your tab won't work with a given project, then return false from this method and add a string to the errors collection explaining why. Some examples might be:
  
       "Only works with OWL.",
       "Doesn't work with OWL.",
       "Hasn't been installed completely. See the readme."
       "Can't handle projects with >10000 frames."
       "Requires foo.pprj to be included."
  
  This method will keep your tab from being selected by a user for projects that it cannot handle and doing lots of bad things.
• The Instances tab now displays sorted instances.
• Replaced the redundant "attached classes" panel in the slots tab with a "superslots" panel. Navigation with this panel directly parallels that of the superclasses panel in the classes tab.
• The constraints slot widget no longer allows values to be set on included classes and the default back-end no longer stores these values.
• Added a method on FrameEvent to return the "old values" on an ownSlotValueChanged event.
• The server "connect" panel now shows the user's machine name for connected users.
• The server now preloads all projects by default. This behavior can be disabled by passing the server the "-noprelaod" option.
• Modified the "create subslot" code to automatically create the appropriate inverse slots for subslots of slots with inverses.
• Refactored SystemUtilities and created a class PluginUtilities that contains about half of it's methods.
• Added "domain" slot to the slots form.
• The template slots value widget can now be removed from the slot form.
• Removed borders from toolbar buttons except when the mouse is over them.
• Modified layout algorithm to generate 3 columns on larger forms.
• Made default column size slightly narrower.
• Modified form "stretching" algorithm to not stretch forms vertically.
• Modified the way the current file encoding is determined before it is printed out when the program loads in order to handle some "problem cases". More information is available in a post from our discussion list archive.
• Removed the User's Guide and Tutorial from the standard distribution. The Help items now go to our Web site.
• Removed bolding from fonts in the Metal UI.
• Added the capability for arbitrary frames to be marked hidden with the API.
• Modified the "About Box" to be moderately less ugly than it was previously.
• Changed the text returned when the "browser display slot" value is not set. Now just the instance name is returned.
• Added a "getClsWidget" method to AbstractSlotWidget.
• Raised the visibility of some methods in DefaultFrameFactory.
• Improved the error message for handling a missing JDBC driver.
• Revised the implementation of FrameID (should be transparent to everyone).
• Changed the "Import" menu item text to be more descriptive.
• The system now prints the text for "cannonical" name rather than the "historical" name for the file encoding on startup.
• Configuring tabs no longer causes all tabs to be regenerated.

Bug Fixes

• The allowed-values for included symbol slots can no longer be edited.
• Implemented the KnowledgeBase.isValidOwnSlotValue() method.
• The "add superslots" panel on the slots tab no longer allows you to set up recursive slot inheritance hierarchies.
• Added "..." as appropriate to some items on the Project menu.
• The "add slot" button on the template slot widget now allows you to pick a slot which is not an instance of the default metaslot.
• Fixed a problem that caused exceptions to be thrown if system slots like :DIRECT-SUPERCLASSES got attached to something that was not a class and then the user attempted to set a value.
• Fixed a problem that occasionally caused part of the slot cardinality multiple widget to become obscured.
• Fixed a problem that caused sample projects in the multi-user system to not load on Unix platforms.
• Fixed a problem that caused deleted frame events to appear to not propagate to clients in the multi-user client.
• Fixed a problem that caused KnowledgeBaseEvents to have no "source" object in the multi-user client.
• Fixed a problem that caused the "save interval" feature on multi-user file projects to not work at all.
• Fixed a problem with graph widget "elbows" getting lost.
• Fixed some graph widget code that was causing the display to be updated more frequently than required.
• Removed calls to methods that have been deprecated in JDK 1.5.
• Fixed a problem with the plug-in dependency mechanism.
• The About Box now shows up when Protege is running under JDK 1.5 beta.
• Disallowed in-place editing of node text in the graph widget when multiple display slots are configured.
• Fixed problem in the graph widget with not being able to "draw" reified relations between nodes.
• Prevented "archive" on new projects (which used to throw exceptions).
• Put in work around for metrics panel header display problem on Mac.
• Fixed problem with "errors window" going to the back on load.
• Fixed problem which caused duplicate delete class events.
• Launching a browser for displaying help now works on the Mac.
• Fixed a number of problems with Undo, most of which were related to UI operations requiring multiple Undo actions. All UI operations should now just require a single "undo" action to reverse. Note that this change required some modifications to the "handleRemove" protected methods for most of the standard cardinality multiple widgets. If you've subclassed one of the standard widgets to override this functionality, your widget may now be broken.
• Removed some useless information that was being written to the PINS file.
• Fixed a bug in the graph widget that was preventing "Undo" from working when adding/removing nodes from the graph.
• Fixed some broken links on the "index.html" page that is installed in the root directory and points to local and on-line Protege documentation.
• Modified "create inverse slot" code to automatically create an inverse slot that has the correct allowed-classes, domain, and superslots.
• Made some hacks so that subslots of :DIRECT-TEMPLATE-SLOTS behave more "correctly".
• Fixed a number of API methods that didn't work when accessing a project on the server.
• Journaling now works.
• Fixed a problem which caused "java packages" classes not to load from a plugin directory.
• Fixed behavior of subslots so that the correct attributes are inherited from their superslots.
• The CLIPS back-end no longer creates and then deletes a class as a side effect of doing a save.
• Fixed a problem with plug-in dependency mechanism when dependent plug-ins are missing.
• Fixed a problem in the multiuser version that caused clients to stop updating.
• Worked around a problem that would show up intermittently when writing a knowledge base to MS Access.
• Fixed a problem in the Graph Widget that was causing nodes added programmatically (rather than through drag and drop) to draw into negative space behind the palette.
• Cleaned up the display of the "Configure Tabs" panel.
• Fixed a problem that caused the "Project Load Error" window to hide behind the application window.
• "Save" menu items are now disabled for the multiuser client.
• Fixed a "slot at class" update problem in InstanceDisplay.