Unit 5 Reading Notes
Database:
There are different types of databases linked to the type of computer systems they support, however all databases are structured so that they can integrate with others through the Open Database Connectivity (OBDC). Operational databases are business /organization oriented with modules catering to all aspects of the organization’s needs. They are therefore structured to suit particular groups of end users.
Indexing is an important feature of databases since it impacts the time required for running a query, however, maintenance of it slows down the system because of the many possibilities it requires for accurate indexing. Database replication allows multiple copies of a database on different computers for increased user access. Different levels of authorization are utilized to control system accessibility; databases generally require authorization for access depending on the target user.
Introduction to Metadata:
Data about data, Metadata is significant for classifying, describing, locating and creating data with a view to aid in the location and utilization of same. All information objects have three features- content, context and structure. Library metadata is governed by rules and regulation of a specific governing body such as AACR2 or LCSH. It has been recognized that no one single metadata standard can cover all types of information objects especially since data and information is increasing at such a fast pace, never-the-less, a structured metadata system is vital for creating widespread access to usable information packages. This means also, that the use of this structured metadata system would have to be taught to users or it will not serve its intended purpose.
There have been an increase in user created metadata and though these generally serve a particular group or community (folksonomies), these community specific labeling are proving to be a success even outside of their grouping especially with those who are familiar with the semantics of the grouping. This has given rise to metadata that is based on the objects creation or origin and the target user with consideration for the user capability.
All information objects have a life cycle ranging from creation to obsolescence?
Metadata is crucial to effective data management.
Dublin Core Data Model:
1. An international effort that attempts to create consensus in resource management/metadata creation.
2. Aims to apply a ‘core set of semantics’ that will cater for all types of resources and its descriptors.
3. There is still a lot of work to be done with this ‘work in progress”.
I doubt that the Dublin Core Data Model will ever be accepted as finished. How could such a project ever be agreed upon? The best you could do is put it out there and hope that the interested parties accept and adopt it. It will be a gamble.
ReplyDelete"...and hope that the interested parties accept and adopt it."
ReplyDeleteThere's a lot to comment on in that phrase. Number one is that there are interested parties. Information professionals no doubt will understand the need for a core set of semantics, but what about your grandma or 10-year old posting pictures to a Flickr account? I fear that the uninterested parties would outweigh the interested parties. Number two is that the interested parties accept and adopt it. That in itself is a gamble. People may or may not recognize DCDM as the ultimate resource.
Melissa, you bring up lots of important points. I think the Dublin Core initiative is a great one, but finding ways to attract such a huge array of users to accept a standard, core set of semantics, is no doubt a gigantic, hard-to-accomplish task. With the accessibility of tagging and the constant use of the Web to communicate and form communities surrounding certain information and interests, it's going to be very difficult (if not impossible) to attract communities of people and make this project meaningful across the board.
ReplyDelete