When you explore a new data set, you don't necessarily know much about it. You can use SPARQL to learn about the metadata of your set as well. Here, we'll start with James Dean, but we're really interest in metadata about actors in general.
You can download the dataset for these queries here.
You can cross-reference the queries to the book by query number or name.
Query ch6.10 All about James Dean 
We can use a single triple to find out all the things the data set knows about James Dean, and what it calls the properties that define it
Query ch6.11 What about James Dean?
We can project this and only get the property names.
Query ch6.12 Just what about James Dean?
But that means some properties will appear twice. We can ask for the distinct ones.
Query ch6.13 What about any actor?
We might know things about some actors that we don't know about James Dean; we can use this same idea to investigate actors in general.