|Contemplate™||Web Templating System|
The first step to building a site with Contemplate is understanding how the different pieces fit together. A Contemplate site consists of templates, content files, the Contemplate scripts, and an optional page definitions file:
In a Contemplate site, a template is simply an HTML page that contains these references, which use a syntax similar to traditional server-side include tags. We call these references "embed tags," because they let us embed content into a template. You can also think of an embed tag as a placeholder, marking a spot where various pieces of content will appear. The simplest form of embed tag looks like this: <!--#embed footer -->.
If templates are the domain of the HTML coder, content files are the domain of content writers and editors. The simplest form of content file is a plain HTML file with one large table; each table cell contains one piece of content, which we call a "field." These pieces of content can be as large or small as you like, can contain any HTML tags, client-side, or even server-side scripting, and can be grouped into content files in whatever way is useful for the people maintaining the site. For an example, you can view the content file where this text resides.
On first glance, you might find it odd that many pages worth of content are contained in a single file, but this setup has some big advantages for site editors. Checking files out of a version control system or document repository, making changes, spell checking, uploading, and keeping track of which files have changed are all easier when content is grouped in this way. After all, a 200 page site is much easier to maintain when it consists of only 10-20 rather than 200 files.
The heart of Contemplate is a single server-side script that merges pieces of content into templates in real time to create the pages that the website visitor sees. In addition, the Contemplate package includes scripts that can "flatten" a site, doing all the merging at once and creating static HTML pages; scripts that display easy-to-read summaries of visitor traffic saved by an optional reporting feature; and scripts that help site administrators formulate new pages (new combinations of content and templates) in a direct, visual way.
Now that we've defined the three core elements of a Contemplate site, we can provide an example. You might create a template called default.html and include this embed tag: <!--#embed main -->. Then you might create a content file called content.html that contains several fields, one of which is named strawberry. If you then browse to the URL contemplate/assembler.php?template=default.html&main=field,content.html,strawberry, Contemplate will open the default template, get the strawberry content from the content file, and display it in the spot marked out by the main embed tag.
Creating pages by passing arguments into templates can quickly become cumbersome, so site developers can optionally pass a single "page" argument into a template instead. Contemplate will look this value up in a shared "page definitions file," where the arguments that define each page are stored. Besides allowing for cleaner URLs, the page definitions file allows you to change a page's composition in one place rather than changing all the links to it site-wide. And once you start using page definitions, it's easy to change the composition of your URLs with your server's URL rewriting features.
|Contemplate is developed by Arlo Leach.|