Secrets of using the OpenCms CRE

Date: May 5, 2008
Time: 12:00 - 13:00
Track: Technical
Type: Presentation
Speaker: Michael Moossen (Alkacon Software GmbH)


The OpenCms 7 Content Relation Engine (CRE) is one of the most important improvements of OpenCms compared to previous versions. The CRE allows OpenCms to easily and efficiently track any kind of relations between two resources in the OpenCms Virtual File System (VFS).

In this session we will quickly review the obvious usages of this feature in the OpenCms workplace, like link validations during deletion or publishing or XML content edition, as well as new derivated features, like the possibility to publish resources together with all their related resources, or the categorization of resources.

We will then focus on more advanced usages, like XML content options to set the type of a relation or how to treat broken relations, as well as using the %(link) macro in JSP files to ensure consistent JSP file generation after changes in included files.

At the end we will see how to create and use user defined relation types, and take a quick look to the most important implementation details.

Latest News

  • OpenCms 10.5 Beta available

    Sep 26, 2016 - OpenCms 10.5 Beta provides a feature complete look at OpenCms 10.5. This will be the only pre-release version before OpenCms 10.5.0 is published, which is expected by the end of November. Only minor GUI updates, as well as improvements to the demo template, will be made for the final release.

  • OpenCms 10.5 Beta Release Notes

    Sep 26, 2016 - The OpenCms 10.5 Beta release notes contain detailed information about the new features and fixes in this beta version.

  • OpenCms 10.0.1 available

    Jun 14, 2016 - Being the greatest OpenCms update for years, version 10 brings a vastly improved user experience that combines the intuitive "Direct Edit" approach of OpenCms with a new, well integrated Lauchpad app center. OpenCms 10.0.1 is a maintenance update for 10.0.0 installations. It fixes several issues that persisted in previous releases. This version focuses on performance and stability.

  • OpenCms 10.0.1 Release Notes

    Jun 14, 2016 - The OpenCms 10.0.1 release notes contain detailed information about the updates and fixes in this version.

Try the OpenCms Live Demo