Stable Identifiers

Copying the URL in your browser’s address bar of the webpage where you viewed a resource is not the best way to identify that resource. You want to use the resource’s stable identifier. A stable id is the resource’s permanent, unique id, which is independent of any web-page where it may be displayed. The stable id should be available on any webpage where you view a resource, although it can be sometimes tricky to find it.

This document will help you locate the stable identifiers for resources commonly used by Classics researchers.

Signs of a Stable Id

Although there are no exact standards for what a stable id looks like there are commonly used words and phrases that identify one:

• Permalink
• Canonical URL
• Canonical URI

Stable Ids of Known Resources

Perseus Texts

All references to primary source texts available in Perseus should use the CTS-enabled CITATION URI from the Stable Identifiers section in the Perseus text display

Perseus Artifacts

References to Artifacts from the Perseus Art and Archaeology collection should use the Permalink for the artifact in the “Web Page” column of the row of the timeline spreadsheet. This link can be found at the top left of the artifact description page in Perseus. Right click on the link to copy the actual url.

Pleaides URIs

All references to places in the ancient world should use Pleaides URIs.

These can be found near the middle of the main page for a Pleiades place:

Pleiades Coordinates

For timelines, you may need the latitude and longitude coordinates. It’s best to use the geoJSON format for this. You can find this for Pleiades places by clicking on the DARE or DARMC location links that appear to the right of the map:

When you click on this link, you will see the coordinates represented under a field entitled “Geometry and Coordinates” as in the example below. E.g. in this example { "type": "Point", "coordinates": [ 23.317799, 38.319076 ] } Make sure to copy the {} and [] exactly as appears on the page.