4. Pipes
Unix Pipes, Yahoo Pipes, Teqlo, Drain Pipes, Half-Pipes
grep index.html access.log | awk ‘{print $2 }’ | sort | uniq | wc -l
Tools to build hosted mashup applications
Cocoon patterns are merging into the mainstream. Pipes mashes up data feeds, Teqlo orchestrates the inputs and outputs of widgets
Paloose is a simplified (much simplified) version of Cocoon using PHP. There are relatively few ISPs who will support Java/Tomcat for web sites and this is the authors solution to that dilemma
XProc - An XML Pipeline Language
http://www.w3.org/TR/xproc/