Learning RDF and RDFS – help!

I'm getting myself up to speed on RDF (and RDFS) and building molecular repositories as an example. I'm using  the Jena Semantic Web Framework (Open Source , Java, HP-inspired) and so far like it. But I have only done a little bit (subject-predicate-object) Jim tells me that what I have produced so far needs cleaning up. As a minimum I have to use RDF types (rdf:type).
I like learning by example – give me a few examples of RDF-XML and the corresponding Jena code and that will go a long way. But although I could do this easily for the simple stuff the Jena tutorial runs out before RDFS. And the Javadoc is enormous. I'm impressed, but I don't know where to start. There are no obvious package or class names. Everything uses abstract language. How do I learn about ranges and domains unless I can see some working examples and create some?
So rather than exposiing this on an RDF-specific list (which I may do later) I'm wondering if there are any kind readers who can point to some examples of RDFS-XML and even better if they can suggest how to hack them in Jena.
TIA