- Prefixes can be chosen freely and the prefix declaration shows what each prefix stands for. Yet, many prefixes are standardized and some query services, such as [[DBpedia]] and [[Wikidata]] have them predefined.
- To get the list of predefined prefixes in [[DBpedia]] , go the endpoint and select from menu Tables β Namespace Prefixes. Here’s a direct link.
- To get the list of predefined prefixes in [[Wikidata]], go to the service user interface and click on the pin icon on the left.
- To add standard prefixes when using YASGUI, type PREFIX and start typing the standard one until it appears for autocomplete.
- The most commonly used namespace lookup service is http://prefix.cc .