The Catholic Semantic Web does not exist (yet). It will eventually happen due to the development of the Semantic Web and the Catholic Church's presence on it. It is not a different web, but just as social media developed on the internet, so too will the semantic web develop.

Opencatechesis in an initiative to create a free opensource Catholic formation course and resources. While the opencatechesis.org website is live, there is not much there.

CATECHISM XML (C3ML)

C3ML (Catechism of the Catholic Church Markup Language) is a XML for the Catechism. There is already a XML for scripture, why not for the Catechism?

This is a proposal for using natural language processing tools to automatically concept map the Catholic Catechism. You can read it here.