Table of Contents Table of Contents Title and Copyright Information 1 Preface Purpose Audience Documentation Accessibility Critical Patches Diversity and Inclusion Conventions 2 Introduction How to use this Guide 3 Extensibility Approach Features Layers Release hierarchies 4 Extensible units Application Server Layer Language xml SYS Java Script File Kernel JavaScript File Cluster JavaScript File Custom JavaScript File Database layer – Maintenance Function ID Main Package Hook Packages Kernel Package Cluster Package Custom Package Database layer – Bypassing base functionality