Experiments in GNOMEland

Just a quick followup to yesterday’s post about hormiga having its first interesting features, the following code now works:

public class HormigaTest {
    public HormigaTest () {
    }
    public void run () {
        try {
            foreach (Photo p in Photo.loadAll ()) {
                if (p.tags.size != 0) {
                    foreach (Tag t in p.tags) {
                        message ("Photo %s has tag %s", p.title, t.label);
                    }
                }
            }
        } catch (Error e) {
            warning ("Couldn't load tags: %s", e.message);
        }
    }
}

public static int main (string[] args) {
    var t = new HormigaTest ();
    t.run ();
    return 0;
}

What does that mean? We now have support for predicates pointing to other resources (here, the nao:hasTag predicate), and basic support for collections, aka multi valued predicates.

For the record, the mapping files are included below:

Photo.map

{
    "Class": "nmm:Photo",
    "Name": "Photo",
    "Properties": [
        {
            "Property": "dc:title",
            "Name": "title"
        },
        {
            "Property": "nao:hasTag",
            "Range": "nao:Tag",
            "Name": "tags"
        }
    ]
}

Tag.map

{
    "Class": "nao:Tag",
    "Name": "Tag",
    "Properties": [
        {
            "Property": "nao:prefLabel",
            "Name": "label"
        }
    ]
}

I added a Range keyword the Property in the mapping, because sometimes you want to override the range specified in the ontology. In this case, nao:hasTag has a range of rdfs:Resource, and we want to retrieve nao:Tag objects.

PS. Dear GNOME admins, could we have some antispam mechanism on blogs.gnome.org? I’m flooded with spam for ant killing products…