Apache {{% SIS %}} implements the following standards from the Open Geospatial Consortium (OGC), the International Organization for Standardization (ISO) or the Java Community Process (JCP). The same standard is sometime published jointly by both {{% OGC %}} and {{% ISO %}} organizations. Links to free versions of the standards are given when available. The Upgrade needed column indicates that a more recent version of the standard is available but that Apache {{% SIS %}} has not yet been upgraded to that version. Some standards are implemented partially, others almost fully.