The Big Picture

An overview of how XPat and the DLXS Middleware work together to handle the retrieval and deliver of SGML data. See the Bar Napkin Overview.

• Data Preparation
• Middleware: translates user input into XPat query, retrieves SGML and delivers results wrapped in HTML

Architecture (See DLPS documentation Architecture Overview)

Middleware Functionality (details)

Environment (details)

Configuration (details)

Directory Structure (details)

Other

• Server (we use Apache) (see virtual host information)
• Authentication/Authorization
  • DLPS Apache module
  • Middleware only requires that a list of auth colls are put in the environment
• xpat daemons to allow cross machine access between Middleware and Xpat