System IDs are unique, auto-incrementing, numerical values that are autogenerated for all content entries in a Symphony project. An entry’s system ID behaves like a hidden system field—invisible during entry creation and editing, but available to data sources for filtering, sorting, and output.


System IDs are auto-generated upon entry creation and are not editable.

The system ID field is available to data sources for filtering, sorting, and populating output parameters.


Whenever an entry is returned by a data source, its System ID is provided as an attribute in its XML.

    <entry id="1">
        <!-- Entry fields XML -->

The Big Picture

Field types that create relationships among entries, such as Select Box Link, use system IDs to manage those associations. A section called “Children,” for instance, might use a Select Box Link field called “Parent” to point to a section called “Parents.” The field would store the parent’s system ID, this way any of the parent entry’s content could change and the link would still be maintained.

Related Concepts

Symphony • Open Source XSLT CMS

Server Requirements

  • PHP 5.3-5.6 or 7.0-7.3
  • PHP's LibXML module, with the XSLT extension enabled (--with-xsl)
  • MySQL 5.5 or above
  • An Apache or Litespeed webserver
  • Apache's mod_rewrite module or equivalent

Compatible Hosts

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