Exchange format - structure, Humanities

Structure 

Records in automated systems may be of fixed length or variable length. Fixed length records in a file must each contain the same fields and -any given field must always be of the same length from one record to another. If a field is repeatable, it must be repeated the same number of times in each record. Variable-length records may be variable because they do not contain the same number of fields (a given field may not occur in every record) or because a given field is not always of the same length. Bibliographic records do not fit naturally into the fixed - length pattern. 

An example of a database whose records can be treated as fixed length is a mailing list for officials within organizations. In each record there can be fields for each of name, job title, province, state, postal code. Few of any of these data elements will always be the same length, but most of them will have a similar length. Each data element is allocated a number of characters and any space not used will be filled with blank spaces. The system designer has to allocate to each data element a suitable number of characters which will not be too small to accommodate the majority of records, but not too large also, to waste space by having records full of spaces. Most records in a mailing list will include all the fields mentioned above and there will not be too many fields in a mailing list database which are completely filled with spaces. In bibliographic records, the situation is different. 

  1. Many fields occur only from time to time, for example cover title, ISSN, edition. The edition, appears in bibliographic records only when the document contain specific edition statement or when it is known to be other than a first edition. 
  2. Many fields occur for a variable number of time in each record. For example: A document may have one author or it may have any number of joint author. The same document may be a member of more than one series. A record may be assigned more than one subject descriptor. 
  3. A data element may vary in length between records. This is true in most systems which do not code their data but record them in ordinary language. 
Posted Date: 10/25/2012 8:49:49 AM | Location : United States







Related Discussions:- Exchange format - structure, Assignment Help, Ask Question on Exchange format - structure, Get Answer, Expert's Help, Exchange format - structure Discussions

Write discussion on Exchange format - structure
Your posts are moderated
Related Questions
Citation Indexes Citation indexes are unique from the point of view of technique followed. They are based on citations made in current documents. They follow a novel metho

State Rawl 's principles?   (1) Every person is entitled to the most extensive amount of liberty compatible with an equal amount for others.  (2) Differences in social power

I need report on Art criticism. Do you provide help in topic Art criticism. I need expert's assistance to solve my college assignment. Please suggest if it works for me.

STANDARDS Standard relates to quality of product in use in our daily life. They cover not only house-hold goods, but the various products that we need for living in this world:

"It acknowledges that the national authorities enjoy a wide margin of appreciation in matters of morals, particularly in an area such as the present which touches on matters of bel

What is the difference between tribe and caste

Author Approach   Of the three approaches, author approach is most common. There are several reasons for it. The first of these is that the author's name is an easily identifia


Authorship   Having seen the predominance of author catalogue, we need to know what constitutes authorship in the context of cataloguing. It is seen above that AACR-2 regards a

Universal A universal bibliography is one that includes everything that is issued, published, or processed in the field of knowledge from the beginning to the future. Dr. Ra