By accepting the license of OpenVocabulary, you agreed to index it using Sindice semantic index service.

The easiest way to do that is to declare a semantic sitemap of your vocabularies files. Semantic sitemap is an extension to Sitemaps protocol. It enables to inform search engines about pages on your sites that are available for crawling. Semantic sitemap is targeted at the efficient discovery and use of RDF data.

An example of the simplest semantic sitemap is presented below:

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
        xmlns:sc="http://sw.deri.org/2007/07/sitemapextension/scschema.xsd">
  <sc:dataset>
    <sc:datasetLabel>Knowledge Hives LOD Vocabularies</sc:datasetLabel>
    <sc:dataDumpLocation>http://example.com/directory/rdf_dump.gz</sc:dataDumpLocation>
    <lastmod>2011-04-01</lastmod>
    <changefreq>monthly</changefreq>
  </sc:dataset>
</urlset>

Changing the sc:dataDumpLocation element appropriately is just enough for you. For more details see the Semantic Sitemap description.

After that you may also point out your sitemap file to crawler bots, by adding a line in your robots.txt:

Sitemap: http://www.yoursite.com/sitemap.xml

Finally, send a request to Sindice to index your files as described here. For example using curl:

curl -d "url=http%3A%2F%2Fwww.example.com%2Fdirectory%2Fsitemap.xml&email=admin%40example.com" -H "Content-Type: application/x-www-form-urlencoded" http://sindice.com/api/v2/sitemap