You can query just the metadata in an unknown data set.
You can download the dataset for these queries here.
You can cross-reference the queries to the book by query number or name.
Query ch6.14 Find all classes in the data 
If the dataset declares its classes in even a very simple ontology, you can query for it.
Query ch6.15 Find all properties in the data
You can find everything in the predicate position in any triple; these are properties in use in your data.