Abstract
In this article, two deductive languages are introduced: the language Xcerpt, for querying data and reasoning with data on the (Semantic) Web, and the language XChange, for evolution and reactivity on the (Semantic) Web. A small application scenario is given as a motivation for these languages.

URL:
http://rewerse.net/publications/rewerse-publications.html#REWERSE-RP-2004-21

BibTeX:

@inproceedings{REWERSE-RP-2004-21,
	author = {Fran\c{c}ois Bry and Sebastian Schaffert and Paula-Lavinia P\u{a}tr\^anjan},
	title = {Xcerpt and XChange: Deductive Languages for Data Retrieval and Evolution on the Web},
	booktitle = {Proceedings of Workshop on Semantic Web Services and Dynamic Networks, Ulm, Germany (22nd--24th September 2004)},
	year = {2004},
	organization = {GI},
	url = {http://rewerse.net/publications/rewerse-publications.html#REWERSE-RP-2004-21}
}