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New Riders -- The Zope Book PDF 下载
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Chapter 1: Introducing Zope
This chapter explains what Zope is and who it's for. It describes in broad strokes what you can do with Zope.
You also learn about the differences between Zope and other web application servers.
What Is Zope?
Zope is a framework for building web applications. A web application is a computer program that users
access with a web browser over the Internet. You can also think of a web application as a dynamic web site
that provides not only static information to users but lets them use dynamic tools to work with an application.
Web applications are everywhere, and web users work with them all the time. Common examples of web
applications are sites that let you search the web, like Yahoo, collaborate on projects, like SourceForge, or
communicate with other people over e−mail, like HotMail. All of these kinds of applications can be
developed with Zope.
So what do you get when you download Zope? You actually get a lot of things. Zope consists of several
different components that work together to help you build web applications. Zope comes with:
A Web server
Zope comes with a built in web server that serves content to you and your users. Of course, you may
already have an existing web server, such as Apache or Microsoft IIS and you may not want to use
Zope's. Not to worry, Zope works with these web servers also, and any other web server that supports
the Common Gateway Interface (CGI).
A Web based interface
When you build web applications with Zope, you use your web browser to interact with the Zope
management interface. This interface is a development environment that lets you do things like create
web pages, add images and documents, connect to external relational databases and write scripts in
different languages.
An object database
When you work with Zope, you are mostly working with objects that are stored in Zope's object
database. Zope's management interface provides a simple, familiar way to manage objects that
resembles the way many common file managers work.
Relational integration
You don't have to store your information in Zope's object database if you don't want to, because Zope
works with other relational databases such as Oracle, PostgreSQL, Sybase, MySQL and many others.
Scripting language support
Zope allows you to write web applications in a number of different languages, like Python, Perl, and
Zope's own Document Template Markup Language (DTML).
These are just some of the compelling features that have made Zope so popular for developing web
applications. Perhaps Zope's best feature of all is its friendly, open source license. This means that not only is
Zope free of cost for you to download, but you are also free to use Zope in your own products and
applications without paying royalties or usage fees. Zope's open source license also means that all of the
"source code" for Zope is available for you to look at, understand, and extend. Zope does not lock you into a
proprietary solution that could hold you and your web users hostage.
From a business perspective, there are three key ideas to understanding what Zope can do for you: powerful
collaboration, simple content management, and web components. The following sections are mostly oriented
towards business people making decisions about Zope, so if you are interested in jumping right in, skip to the
next chapter, Using Zope.
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