Information Technology Reference
In-Depth Information
Tabl e 1.
Mapping from webbles and webble annotations to RDF graphs
Webbles and annotations
RDF
webble
w
w
slot
s
of webble
w
w wb:hasSlot w:#s
value
w
w:#s wb:hasValue v
pair (
a, v
) in annotation
An
(
i
)
iav
webbles and annotations
v
of slot
s
of webble
an RDF graph
dc:title
http://a/b/c.jpeg
La Joconde
wb:
hasValue
wb:
hasValue
wb:
hasValue
wb:annotates
ValueOF
wb:represents
#url
#url
#title
dc:title
wb:hasSlot wb:hasSlot
wb:hasSlot
wi
wm
dc:title
dc:title
Image
Webble
Metadata
Fig. 6.
RDF representation of webble annotation
represented as solid line arrows, and statements inferred by the entailment rule
are represented as dashed line arrows. An RDF representation of webble anno-
tations consists of graphs representing annotations of webbles and slots (webble
graph), and graphs representing annotations of contents (content graph). As we
can see from this example, our framework can produce “clean” content graphs,
that is, content metadata is represented by using only standard controlled vo-
cabularies without webble specific vocabularies. This is an advantage for inter-
operability of webble annotations with existing metadata standards. By storing
RDF representations of webbles into webble repositories, we can search webbles
by using SPARQL which is a query language for retrieveing information from
RDF documents.
2.4 Enhancing Webble Behavior Based on User Annotations
The webble architecture provides a webble composition mechanism and a slot
connection mechanism. The design of these mechanisms are intended to combine
arbitrary pairs of webbles and slots. As we mentioned in the introduction, such
over-flexibility entails the risk of misconnections. Regarding webble composition,
the current webble architecture does not provide any information for restricting
the combination of webbles to be combined. For slot connection, one possible
solution is type-checking of slots. However, basically, webbles are designed and
should be designed for preserving interoperability of webbles by choosing their
