# Automatic content extraction

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**Automatic content extraction** (**ACE**) is a research program for developing advanced [information extraction](/source/Information_extraction) [technologies](/source/Technologies) convened by the [NIST](/source/National_Institute_of_Standards_and_Technology) from 1999 to 2008, succeeding [MUC](/source/Message_Understanding_Conference) and preceding [Text Analysis Conference](https://www.nist.gov/tac/).

## Topics and exercises

Given a text in [natural language](/source/Natural_language), the ACE challenge is to detect:

1. **entities** mentioned in the text, such as: persons, organizations, locations, facilities, weapons, vehicles, and geo-political entities.
1. **relations** between entities, such as: person A is the manager of company B.
1. **events** mentioned in the text, such as: interaction, movement, transfer, creation and destruction.

The program relates to [English](/source/English_language), [Arabic](/source/Arabic_language) and [Chinese](/source/Chinese_language) texts.

The ACE corpus is one of the standard benchmarks for testing new information extraction [algorithms](/source/Algorithm).

## References

- George Doddington@NIS T, Alexis Mitchell@LD C, Mark Przybocki@NIS T, Lance Ramshaw@BB N, Stephanie Strassel@LD C, Ralph Weischedel@BB N. [The automatic content extraction (ACE) program–tasks, data, and evaluation.](https://web.archive.org/web/20150126022215/http://www.citeulike.org/user/erelsegal-halevi/article/10003935) 2004

## External links

- [MUC](http://www.itl.nist.gov/iaui/894.02/related_projects/muc/) - ACE's predecessor.
- [ACE](http://projects.ldc.upenn.edu/ace/) [Archived](https://web.archive.org/web/20130925194420/http://projects.ldc.upenn.edu/ace/) 2013-09-25 at the Wayback Machine (LDC)
- [ACE](https://web.archive.org/web/20060308054306/http://www.itl.nist.gov/iad/894.01/tests/ace/) (NIST)

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Adapted from the Wikipedia article [Automatic content extraction](https://en.wikipedia.org/wiki/Automatic_content_extraction) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Automatic_content_extraction?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.