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Xholon runtime framework executes applications that are event-driven or that have highly dynamic structure or behavior. Specify your models using XML and Java, or using third-party UML2 tools and MDA transformations.
To get started, read or actively work through the basic HelloWorld tutorial. Its a very simple application, but it demonstrates many of the main concepts.
For more detail on the concepts behind Xholon, you might want to read one of the papers thats been published. These describe how to model cells and other complex biological entities using tools designed for developing real-time and embedded systems.
This earlier work used Rational Rose RealTime and C++, rather than the current Java. Xholon is intended to be a runtime framework that can execute the same types of systems described in those papers, plus many more traditional non-biological event-driven systems.
The goal of the Cellontro sister project is to develop complex biological simulations using the Xholon framework. Most of the features described in the published papers have been re-implemented as Cellontro applications using Xholon.
Also have a look at the sample applications that are included with the Xholon software. These give an idea of the range of applications that can be supported by the Xholon runtime framework.
These have been employed as use cases to determine what functionality is most important in Xholon. The digital watch simulation is a good example of a Xholon application with a hierarchical state machine, developed using a UML modeling tool.
A Xholon is essentially a holon. A holon is an entity that lives within a hierarchical structure, and is both a whole and a part at the same time.
In mainstream computer science terms, a Xholon is a node in a tree. The node has a single parent, possibly one or more children, and possibly one or more siblings. A Xholon may also be an active agent able to interact in real-time with other Xholons in the tree.
In UML2 terminology, a Xholon is a structured classifier that may exist as a part within other structured classifiers, and that may in turn contain other structured classifiers as parts of itself. The result is a hierarchical containment structure, nested to an arbitrary number of levels.
As a part, a Xholon plays a specific role within another structured classifier. Xholons are UML classes that are subsequently refined using UML2 composite structure diagrams. Structured classifiers interact with each other through ports, by passing messages or by making function calls.
Using the more philosophical terminology used to describe holons, a Xholon is something that is simultaneously both a whole and a part. Since everything in the universe is a holon, then everything running within a computer application should be a Xholon. The term holon was invented by Arthur Koestler in 1967.
The Xholon Project is inspired by biological concepts. A major incentive behind the project is to build a run-time environment that is equally adapted to running simulations of biological systems, and to running more traditional real-time, embedded and other event-driven reactive systems.
Xholon applications may contain structures that are highly mutable. A Xholon is an active agent that can modify the tree structure in which it lives. It can navigate the tree to interact with any other node, it can add, delete or modify other nodes, it can exchange messages with other nodes, and it can move itself to another position within the tree.
The Xholon Project incorporates many concepts of the Real-time Object-Oriented Modeling (ROOM) methodology, much of which has been incorporated into UML2. At the same time, Xholon removes some of the limitations of ROOM to allow for greater flexibility, mutability and mobility of active objects.
The Xholon run-time can serve as a target for a Model Driven Architecture (MDA) transformation pipeline. MDA stresses the importance of models, and the ability to transform those models, through a series of steps, into an executing target system.
You can create your model using a UML tool such as Gentlewares Poseidon or NoMagics MagicDraw, save the model as an XMI file, transform it using XSLT (or by some other MDA means) into a Xholon model and application, and then execute the model.
Enhancements:
- UML state machine simulation capabilities have been extended, including animation, and fork, join, junction.
- Additional Agent-Based Modeling functionality is available.
- The NetLogo-like syntax has been enhanced.
- The architecture is more flexible and is ready to more fully support integration of multiple domains.
- Histograms and probability distributions are now available. Line charts update in real-time.
- Numerous other modeling, simulation, transformation, and execution features have been added.

Business Oriented Framework (BOF) is a Perl application server. It uses SOAP, optionally secured with SSL, to communicate with the client.
The client can use SOAP::Lite or the client module included in BOF, making it easy to connect to the server. User, grou
Enhancements:
- Added support for Schedules and tasks

Midgard Components Framework (also called MidCOM) is an advanced component architecture which extends the Midgard Web content management framework. It provides mechanisms for building a Web site using components without much need for writing code to glue all this together.
The administration site gets built automatically by using those components. Goodies like a caching engine and subrequests make site building even easier.
Enhancements:
- Full multilingual content support, performance enhancements, and support for Midgard builds that have the legacy API disabled were added.

Neural Network Framework project is a C++ framework to develop, simulate, and analyze arbitrary complex neural networks.
The programmer can use the classes provided to create neural networks with arbitrary topology and mixed type of neurons. Its very easy to add customized neurons and layers.
Enhancements:
- A ScaleFunction that scales the input vector of a Cluster and a normalize method for RealVec were added.
- Two methods were added to the Random class to randomize RealVec and RealMat.

Keystone is a cross-platform, object oriented application framework which allows applications to be written to build on the target platforms of GNU/Linux and Win32 without modification of their source.
Keystone Application Framework implements several modern Web standards, including SVG graphics and the XUL user interface description language.
Enhancements:
- A significant development in this release is the optional use of the GDI+ (Win32) and CairoGraphics (Linux) rendering backends to render SVG content.
- In addition, support for SVG paths has been much improved with the ability to render bezier and elliptical segments.

Dwarf Server Framework is a Java technology-based framework for developing network server applications.
The primary goal of Dwarf is to support development of network servers based on the Internet standards. However, its architecture is quite universal and it is not limited to this kind of applications only.
The first available Dwarf-based applications are the Dwarf HTTP Server with Java Servlets and JSP and Dwarf Mail Server with ESMTP/POP3/IMAP4.
Simple design and very concise API together with an extensive documentation makes the learning and consequent work with the framework easy and fast for the development team.
Modular multithreaded architecture as well as efficient implementation guaranties the performance on top. Incorporation of Java 2 Platform Security Architecture and Java Authentication and Authorization Service (JAAS) helps to meet todays high security demands.
Dwarf Server Framework, although not an all-purpose universal wheel, offers extending the server functionality by customizing almost all its components:
- multithreaded service development
- support for TCP/UDP based services
- authentication via login modules
- authorization based on subjects
- logging and configuration
Furthemore, it comes with the full documentation, guides and examples, and is free of charge for the binary redistribution.
Main features:
Main features
- universal multi-threaded server
- generic TCP and UDP protocol handlers
- extensible remote management
- various utility classes (DNS client, queues, caches, etc.)
- XML-based configuration
Security
- application-independent authentication
- subject-based authorization
- proprietary or third party login modules
- SSL/TLS secure communication
Support
- rich documentation with tutorials
- samples with source code included
License
- free of charge binary redistribution

The Horde Application Framework is written in PHP, and provides the common tools a Web application requires: classes for dealing with preferences, compression, browser detection, connection tracking, MIME, and more.
The Horde Framework does not provide any significant end user functionality and it provides a base for other applications and tools for developers. You will probably want to install some of the available Horde applications, such as IMP (a webmail client), or Kronolith (a calendar).
Enhancements:
- This is a security release that fixes a cross site scripting vulnerability and improves protection against phishing attempts.