From the description:
There is a misconception that Triple Stores are not ‘true’ graph databases because they supposedly do not support Property Graphs and Hypergraphs.
We will demonstrate that Property and Hypergraphs are not only natural to Triple Stores and RDF but allow for potentially even more powerful graph models than non-RDF approaches.
AllegroGraph defends their implementation of Triple Stores as both property and hypergraphs.
The second story (see also A Letter Regarding Native Graph Databases) I have heard in two days based upon an unnamed vendor trash talking other graph databases.
Are graph databases catching on enough for that kind of marketing effort?
BTW, AllegroGraph does have a Free Server Edition Download.
Limited to 5 million triples but that should capture your baseball card collection or home recipe book. 😉