Information Technology Reference
In-Depth Information
###
"!!
###
"!!
Fig. 1. Aexampleworkflow
webble whose content (i.e. the image contained in the webble) is annotated by
the content of a metadata webble. To achieve this goal, the user has to do
the following: (1) search for webbles in repositories for creating the composite
webble satisfying his goal; (2) set slot values, define webble compositions and
slot connections to create the intended webble; and (3) possibly store the created
webble into a repository for future reuse. Figure 2 shows the structure of the
composite webble.
wi
wm
#url
#title #creator …
###
"!!
DublinCore
Webble wm
Image
Webble wi
###
"!!
#url
Fig. 2. Structure of the example webbles
In the composite webble, we can see an image webble wi which can contain
and display an image, and a metadata webble wm which can contain metadata
defined in Dublin Core (hence its name “DublinCoreWebble”). The user wants
to compose these two webbles so that the metadata contained in wm is added to
the image displayed by wi .
This work flow can be done perfectly without any annotations at all. However,
from the practical point of view there are several problems.
1. How can the user e ciently search for webbles in a webble repository?
2. How can the user make this composition without tedious try-end-error
repetition?
3. How can the user expose results of the webble composition in a searchable
form for future reuse?
To solve these problems, we need (1) well-organized webble annotations on which
to base search mechanisms (2) a query language for searching webble repositiories
(3) a mechanism preventing users from performing forbidden operations, and (4)
a mapping rule from annotations of composite webbles to a searchable form.
 
Search WWH ::




Custom Search