This past week I have been investigating various options to transform data to XML to XSL-FO to Apache FOP (for creation of PDF reports). One of my main concerns is the ability to handle large quantities of data. A newer open source XML technology called STX, with an open source Java implementation called Joost, seems to be a promising way to handle such a situation. My question is this: because open source Apache FOP seems to require XSL-FO (aka XSLFO, XSLF) to generate suitable input, it appears at this point that this requirement needs XSLT. Since I understand at this point that STX is a replacement for XSLT, how do I transform XML for Apache FOP use? According to Joost, it is "able to pass its output to FOP for producing PDF output from a stream of XSLFO SAX events". This statement is a bit confusing to me; how does one get to XSL-FO without using XSLT? Any assistance is much appreciated.