Few notes if you want to use it with OSM Scout Server: in addition to type, the names of POIs are searched for the term that you enter into nearby as "Type". The same is done by other engines, if the memory serves me right.

The types that you list seem to be OSM tags and are imported for search engine of OSM Scout Server. However, so far, I have been dropping the POIs without a name. So, parking will be listed only if it has a name (same issue with toilets). This should be probably improved, I'll have to think how. If some tag is missing in OSM Scout Server, let me know by filing an issue at github. Then we can look into it together.

Info regarding available tags: http://wiki.openstreetmap.org/wiki/Tags with the list of many of them at http://wiki.openstreetmap.org/wiki/Map_Features