About Arbortext Styler > Debugging Stylesheets > Performance Profiling for Arbortext Styler or FOSI Stylesheets
  
Performance Profiling for Arbortext Styler or FOSI Stylesheets
Introduction
Processing performance information can be output for APP and FOSI output (Editor and print/PDF ) with Arbortext Styler stylesheets via the set debug command. The output is divided into four functional areas:
1. Context matching, also known as e-i-c matching when processing with FOSI
2. Condition matching, also known as att-matching when processing with FOSI
3. Generated text processing
4. Evaluation of XPath expressions (APP only)
Each of these information types appears in its own section in the output, allowing you to ascertain which type of processing is causing your problem. Once you have isolated the functional area you can continue to produce processing information related to this area only if you wish, since a full set of data can be fairly lengthy. See Sample output for an example of the type of information that will be output.
This section also contains instructions on how to produce the correct diagnostic information in order to investigate some commonly encountered stylesheet problems, plus some sample output for your reference.