The major parts

• Authoring (includes editing)
• Repository (where [how] are things stored?)
• Linking (how can make something of the pieces)
• Presentation (look and interaction)
• Security (who can do what at what stage)
  

Information Architects

Make platform decisions and keep track of the "big picture".

Component Developers

Create software intended for reuse and distribution.

Integrators

Integrate the software written by component developers and native application server services, building an application in the process.

Web Designers

Create the site's look and feel.

Content Managers

Create and manage the site's content.

Administrators

Keep the software and environment running.

Consumers

Use the site to locate and work with useful content.