Hamlets(previously known as IBM Servlet-based Content Creation Framework) is the name of an open source system for generating web-pages originally developed by René Pawlitzek at IBM. He defines a Hamlet as a servlet extension that reads XHTML template files containing presentation using SAX (the Simple API for XML) and dynamically adds content on the fly to those places in the template which are marked with special tags and IDs using a small set of callback functions. A template compiler can be used to accelerate Hamlets.