Hi,
On 20/03/14 03:18, ???? wrote:
Hello ,everyone : I am a student .My name is Li Zhiguo. Now I am
studing about Jena ARQ. Now I have two questions.
Actually, you have 3 :-) Questions on dev@ also count.
Question one: As
you know ,there are two reorder functions in ARQ ,one is default
function ReorderFixed ,and another is ReorderWeighted. What's the
differences bettween them?
ReorderFixed applies an algorithm that is independent of the data.
ReorderWeighted allows the system to supply a weighing function.
http://jena.apache.org/documentation/tdb/optimizer.html
ReorderFixed could have been a specialization of ReorderWeighted.
I have been experimenting with a better ReorderFixed based on two
weightings. It specially de-emphasises rdf:type as that predicate can be
rather unhelpful when choosing order.
Question two: Once I read a document , it says " The ResultSet class
is a container to a Filter chain ". What's is a " Filter chain" on
earth? or How does the "Filter chain" works ?
Where did you see that?
Google says:
http://www.inf.ed.ac.uk/publications/thesis/online/IM100832.pdf
You'll have to ask the author. It's not from the Jena project.
Andy
Thanks to everyone for your help !
