Browse Subjects section is essentially the electronic equivalent
of the Outline of
Cultural Materials (OCM). It consists of two parts: The A-Z Index and Browse Subject
Categories. In both
sections, each OCM
Subject Code links to a detailed definition of the subject,
as well as a list of related codes.
discussed earlier, HRAF analysts use OCM Subject Codes (OCMs) to
index each paragraph of our full-text documents.
Using these codes allows you to search for a concept rather
than just a word. This style of searching circumvents the limitations of
traditional word searches, which do not find synonyms, misspelled
words, or words in other languages.
A-Z Subject Index - Click to see image
A-Z Index lists words or phrases along with their associated OCM
Subject Codes. Those
words or phrases in upper-case are the titles of actual OCMs;
those in lower-case are other words and phrases that people may
look for. As the
figure shows, “MYTHOLOGY,773” is an actual subject code, while
“Mythical Ages, 773” is a common phrase that refers to the
same subject code. Thus, if you were searching for “Mythical Ages,” you
would search with the subject code for “MYTHOLOGY.”
Please realize that this index is not an exhaustive list of
possible words or phrases. Any
two OCM Subjects can be paired or grouped with any other in the
Text Search section.
more information, see "Additional Information" below)
on a OCM code in the index will take you to the OCM category.
Here, you will find a description of the subject code,
cross-references with related subjects, and (if it is a
sub-category) a link to the major subject category.
The OCM’s description is important because it will give
you a better idea of whether that category will yield the
information you are looking for in a search.
Please note that clicking “eHRAF Ethnography Documents
with this OCM” will launch a search for that OCM.
Categories and Sub-Categories
Major Subject Category - Click to see image
subject categories in eHRAF end in “0,” while sub-categories
end in numbers other than “0” or are 4 digits long (and so may
end in “10”). Thus,
Mythology (773) is found under the major heading of Religious
searching with OCM codes, it is best to use the most specific
category possible. This
is because our analysts only use major category codes when the
information does not fit into one of the sub-categories.
Thus, a paragraph on mythology will only be coded under
Mythology and not under Religious Beliefs.
Later on, in the Text Search section, we will learn how to
search for all sub-categories in a major category at once.
OCM Subject Hierarchy - Click to see image
Subject Categories lists all of OCM categories, both major and
sub-categories, in hierarchical order.
All together, there are 83 major categories and over 700
sub-categories covering many aspects of cultural and social life. Thus, in the 770 section, we find “Religious Beliefs”
as the major category because its OCM Code ends in “0”
(770). Below it, we
find all of the narrower sub-categories for “Religious
Beliefs,” such as “Mythology” (773) and “Sacred Objects
and Places” (778). Familiarity
with this hierarchy is useful when searching, as it helps you find
more specific OCMs for your topic of interest.
Outline of Cultural Materials, OCM Subject Codes
to use terms from the A-Z and OCM Indices.