When the knowledge takes the shape of a document, it involves certain additional features not found in the Universe of Knowledge. These drive from the subtle and gross embodiments involves in a book and from readers service, in order to fulfill the laws of Library Science. Additional features are:
a) Quasi class: The class which is specific in nature.
b) Local variations: Based on local problems.
c) Composite documents: Documents which have complex nature.
d) Partial comprehension.
e) From or medium of expression: Medium which is used for expression.
f) Related documents: Documents which are based on likeness.
g) Physique of the documents: Physical body of the document.
Ranganathan enunciated three parts of document classification:
i) Book number;
ii) Collection number;
These are also called Canons. These are the additional canons.
Special Features of Document (Book) Classification
It is a structural organization of knowledge.
It is well-constructed.
It will serve with maximum efficiency of functional organization of knowledge.
It consists of grouping and sub-grouping of subjects.
Grouping is based on experience and further requirements.
It is well-qualified to serve.
It is established in the scientific and educational concerns.
It leads to efficiency.
It leads to adequacy.
It leads to educational value.
It is practical classification.
It is a purposeful classification.
Limitations of Book Classification
Its purpose to arrange books and other materials in helpful order. It depends on careful consideration of possible facet formula within each subject.
No helpful order can satisfy fully.
The passage of time leads radical changes of classification scheme. tremendous labour is required to meet the challenge of enormous increasing record.
Even the best book classification is unable to bring together all the material on the shelves. Books can be scattered according to their nature.
Inter-discipline researches have put a problem before the classifier to keep books of just similar thoughts together.
Poor and faulty work of the classifier in difficult and unfamiliar fields.
Inaccurate and makeshift decisions due to poorly constructed and outdated table of classification.
Long and confusing notation for specific subjects.
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