The Slash Architecture
In Version 2.0, Slash underwent a complete architectural overhaul. The new Slash provides features such as themes, database abstraction support, an API for the database, use of the Perl Template Toolkit, an improved and streamlined installation process, hooks to support addition of third-party modules, and better support for hosting multiple Slash sites.
Slash has always been Free Software, available under the GNU General Public License. With the open-sourcing of the MySQL database, all of Slash’s underlying infrastructure is now open source as well. Slash is built on the Apache web server, the mod_perl Apache module, and a relational database that speaks Structured Query Language (SQL). (MySQL is supported out of the box. Some work has been done to port things to the excellent PostgreSQL database, though it lags behind. Oracle has some preliminary support.)
At the bottom of the traditional software architecture “layer-cake” diagram (see Figure 1-12) squats the operating system. Slash was born on Linux and has been run successfully on FreeBSD, OpenBSD, and several commercial flavors of Unix, including Solaris and HP-UX. As of this writing, Mark Breitenbach (geo@other.org) has ported Slash 1.x to NT; track the progress of the port at http://geo.trippy.org/nt-slashcode/.

Figure 1-12. Diagram of Slash software infrastructure and architecture
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