Zope is a family of free and open source web application servers written in Python, and their associated online community. Zope stands for “The Object Publishing Environment”, and was the first method for the web application. Zope has been recognized as a Python killer app, an app that helped put Python in the spotlight. Over the last few years, the Zope community has several additional web frameworks with disparate aims and principles, but sharing philosophy, people, and source code. Zope 2 is one of the most widespread of these frameworks, which runs on Zope 2. BlueBream (formerly Zope 3) is one of several broad-based sites, including Launchpad. Grok was started as a more program-friendly framework, ”
The Zope Corporation was formed in 1995 in Fredericksburg, Virginia under the name Digital Creations, as a joint venture with InfiNet (a joint venture news channel). The company developed a classified advertisement for the Internet. In 1997, the company became independently owned and private. The company’s software engineers are led by CTO Jim Fulton. PythonLabs, creators of Python, became part of the company in the year 2000. Python founder Guido van Rossum left Zope Corp. in 2003. What is it known as Zope 2 and the merging of three separate software products – Bobo, Document Template, and BoboPOS – into the Principia application server. At the behest of its largest investor, Opticality Ventures, Principia was re-released as free software under the name Zope in 1998. Bobo, and therefore Zope, was the first Web object publishing solution. In November 2004, Zope 3 was released. Zope 3 is a complete rewrite that preserves only the original ZODB object database. Web Application Development Using the newest development paradigms. Zope 3 is, however, not compatible with Zope 2, so you can not run Zope 2 on Zope 3. Zope 3 Five introduced the new Zope 3 paradigms into Zope 2, although full compatibility is not possible that way either. The existence of two incompatible Web frameworks called Zope has caused a lot of confusion. In response, in January 2010, Zope 3 was renamed “BlueBream”. “Zope” and “blue bream”
The Zope Foundation is an organization that promotes the development of the Zope platform by supporting the community. The community includes both open source software, documentation, and web infrastructure contributors, and the consumers of the software platform. It manages the websites, an infrastructure for open source collaboration.
A Zope website is usually composed of objects in a Zope Object Database, not files on a file system, as usual with most web servers. This allows users to harness the advantages of object technologies, such as encapsulation. Zope maps URLs to objects using the containment hierarchy of such objects; methods are considered to be in their objects as well. Data can be stored in other databases as well, or on the file system, but ZODB is the most common solution. Zope provides two mechanisms for HTML templating: Document Template Markup Language (DTML) and Zope Page Templates (ZPT). DTML is a tag-based language that allows simple scripting implementation in the templates. DTML has provisions for variable inclusion, conditions, and loops. However, DTML can be problematic: DTML tags interspersed with non-valid HTML form HTML documents, and to use it when it comes to logic, to retain code readability. The use of DTML is discussed by many leading Zope developers. ZPT is a technology that addresses the shortcomings of DTML. ZPT templates can be well-formed XML documents or HTML documents, in which all special markup is presented as attributes in the TAL (Template Attribute Language) namespace. ZPT offers a very limited set of tools for conditional inclusion and repetition of XML elements. Consequently, the templates are usually quite simple, with most logic implemented in Python code. One significant advantage of ZPT templates is that they can be edited in most graphical HTML editors. ZPT also offers direct support for internationalization. Zope 2 underlies the Plone content management system,
BlueBream is a developer of the Zope 2 web application server. It was created under the name “Zope 3”, but the existence of two incompatible frameworks with the same name caused confusion, and Zope 3 was renamed “BlueBream” in January 2010. BlueBream is distributed under the terms of the Zope Public License and is thus free software. Zope 2 has proven itself to be a useful framework for Web applications development, but its use reveals some shortcomings. To name a few, creating Zope 2 products involves copying a lot of boilerplate code – “magic” code – that just has to be there, and the built-in management interface is difficult to modify or replace. Zope 3 was a rewrite of the software that attempts to address these shortcomings while retaining the advantages of Zope that led to its popularity. BlueBream is based on a component that makes it easy to mix software components of various origins written in Python. Originally intended as a replacement for Zope 2, the Zope Component Architecture has gone back to Zope 2, starting with Zope 2.8. Many Zope Plasma Such Plone are going through the same type of piece-by-piece rewriting. The first production release of the new software, Zope X3 3.0.0, was released on November 6, 2004. the Zope Component Architecture has been backported to Zope 2, starting with Zope 2.8. Many Zope Plasma Such Plone are going through the same type of piece-by-piece rewriting. The first production release of the new software, Zope X3 3.0.0, was released on November 6, 2004. the Zope Component Architecture has been backported to Zope 2, starting with Zope 2.8. Many Zope Plasma Such Plone are going through the same type of piece-by-piece rewriting. The first production release of the new software, Zope X3 3.0.0, was released on November 6, 2004.
The Zope 3 project started in February 2001 Zope has been working hard on the world. The goal was to create a more flexible platform for programming applications than Zope 2 is. The project began with the development of a component architecture, which allows the structuring of code into small, composable units with introspectable interfaces. The interfaces are supported by an interface to the Python language. The first production release of the software, Zope X3, was released on November 6, 2004. In January 2010 Zope 3 was renamed BlueBream.
The goal of the project is to enable programmers in the field of arbitration. In Zope 2, de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention de l’invention. BlueBream uses a model / view architecture, separating the presentation code from the problem domain code. Views and models are linked together by the component architecture. The libraries underlying BlueBream have been evolving into a collection of useful libraries for web application development rather than a single, monolithic application server. BlueBream includes separate packages for interfaces, component architecture, HTTP server, publisher, Zope Object Database (ZODB), Zope Page Templates, Security Policy, I18N, and so on. The component architecture is used to glue these together. The component architecture is configured using a ZCML (Zope Configuration Markup Language), an XML based configuration file language. The Zope 3 project pioneered the practice of sprints for open source software development. Sprints are intensive development sessions when programmers, often from different countries, gather in one room and work together for a couple of days or even several weeks. During the springs various practices drawn from agile software development are used, such as pair programming and test-driven development. Besides the goal of developing software, sprints are also useful for geographically separated developers to meet people and attracting new people to the project. They also serve as a way for the participants to learn from each other. BlueBream is considered a stable framework, used on production projects worldwide, most notably Launchpad.
As a result of the development of Zope 3 / BlueBream, there are many other independent Python packages used and developed as part of BlueBream, and many of these are used outside of BlueBream, many are not. The Zope Toolkit (ZTK) project was started to clarify which packages were usable outside BlueBream, and to improve the re-usability of the packages. Thus the Zope Toolkit is based on the Zope frameworks. Zope 2.12 is the first release of a web framework that builds on the Zope Toolkit, and Grok and BlueBream were set to be based on the ZTK during 2010.
In 2006 the Grok project was started by Zope 3 developers who wanted to make Zope 3 technology more agile in use and more accessible to newcomers. Grok has since then seen regular releases and its core technology (Martian, grokcore.component) is also finding uptake in other Zope 3 and Zope 2 based projects.
As mentioned previously, Zope Page Templates are themselves XHTML documents, which means they can be viewed and edited using standard HTML editors or XHTML compliant tools. Templates can also be checked for XHTML compliance so you can be confident that they will automatically expand into proper XHTML. However, these pages are not meant to be rendered as is. They are marked up with additional elements and attributes in special XML namespaces (see below). This additional information is used to describe how the page should be processed. Here are some basic examples. To conditionally include a particular element, like a div element This is a very cursory explanation of Zope Page Templates. The behavior of Zope Page Templates, TAL, TALES, and METAL specifications:
SchoolTool is an open source student information system that uses Zope.