Classification Browser
Contents


Introduction
The ClassWeb classification browser displays Library of Congress classification data with cross references to authority data, correlations to bibliographic records and links to online library catalogs. There are three versions of the classification browser with varying levels of number calculation. You also have the option of creating local application notes and hyperlinks that are displayed in-line with the classification data. These notes are displayed in red to help them to stand out.

Note: When using the Enhanced and Hierarchy browsers and a modified classification table is applied, some of the classification numbers in your display may have a yellow background. This is normal and the highlighting indicates that these are table modification records.


Classification Browsers
The three versions of the classification browser differ in the degree to which they automate the application of classification tables in their display. Classification tables contain information that is used in more than one place in the classification system. This includes geographic names, forms of material and any other subdivisions that can be reused elsewhere in classification.

By default, ClassWeb uses the Enhanced Browser to display classification data. You can change the default browser for your account using the Preferences link found near the bottom of the main menu. This will affect all users of your account. Alternately, you can excplicity choose which browser you want to use with the links near the bottom of the main menu. I.e.:

Standard Classification Browser - Enhanced Classification Browser - Hierarchy Classification Browser

The three varieties of classification browser are:

Standard Browser
The Standard browser displays the classification schedules with links to other areas of classification and to the classification tables. When you click on a table link in the Standard browser, the data on your screen is replaced with the contents of the table. All classification number additions and calculations must be performed manually.

Enhanced Browser
The Enhanced browser adds support for a calculator that automatically merges classification table data into the main classification display. When you click on a table link in the Enhanced browser, the table is loaded in such a way that the table data appears to be part of the schedules data (including properly calculated classification numbers). Please note that to avoid cluttering the screen, the Enhanced browser will not apply a table and display its content unless you click on a particular table link. Once you click on the link, that table will be merged into the current display with calculated classification numbers. The one time ClassWeb will automatically apply tables is when you enter a classification number into the LC Class # prompt at the top of the screen. In that case, any appropriate tables will be applied to get you to the most specific record possible for a given class number.

Hierarchy Browser
The Hierarchy browser goes the furthest in seamlessly integrating classification data. This version of the browser automatically takes table links as you move around in the data. You navigate hierarchically by moving down one level at a time and by moving up one or more levels at once. Like the Enhanced browser, when you type a number into the LC Class # prompt at the top of the screen, the software will apply as many tables as necessary to get to the most specific record possible. The Hierarchy browser keeps track of your current level and limits the display to that many levels of classification data. By clicking on a link that says  Hide subtopics, Show subtopics or Apply table, you change the maximum depth that the browser will go when creating the display.


Browse Display
Classification data is displayed a page at a time, with twenty-five or more records per page. You can change the default number of records returned throughout ClassWeb by modifying your account settings with the
Preferences link found near the bottom of the main menu. You can also set the number or records for your current session by starting the classification browser using the Bookmarks link near the bottom of the main menu.

The classification browser screen is split into three sections or window panes. They are:

Command and Navigation Buttons, and Classification Number Input Field
Not all of these buttons will be displayed on the screen at the same time. For example, either "Schedules" or "Tables" will be visible, but not both.

ButtonAction
When you input a classification number into the LC Class # field, you can either press the Enter key or click on the Browse button to start browsing. For further information on how to input a classification number, see Locating a Classification Number, below.
Opens a classification search screen in a separate window or tab.
Switches to browsing classification table records.
Switches to browsing classification schedule records.
Reloads the current page from the server. Use this button after you have made a change to the classification system (like creating or modifying a local note, submitting a classification proposal request, etc. to re-display the current page with the latest changes.
Logs you out of ClassWeb.
Closes the current window or tab. ClassWeb can only close those windows or tabs it has opened for you. If you click on the Close button and nothing happens, it is because this window or tab was opened by hand and must be closed manually.
Jumps to the ClassWeb main menu.
Opens this help page in a separate window or tab.
Returns the previous page of records in classification number order.
Returns the previous 1/2 page of records in classification number order. You get a full page of records but 1/2 of them are from the top of your current page.
Returns the next 1/2 page of recodrs in classification number order. You get a full page of records but 1/2 of them are from the bottom of your current page.
Returns the next page of records in classification number order.
LC Class # Input the classification number or span you want to find (i.e. "F201.3.A-Z"). See Locating a Classification Number, below, for more information on how to input this value.
Table ID and LC Class # Input the classification number or span you want to find (i.e. "kf7" or "KF7" to display table "KF7"). See Locating a Classification Number, below, for more information on how to input this value.

Hierarchy Display
This area of the screen displays the full hierarchy of one of the classification records on the screen. The current classification record will be highlighted with a grey-blue band of color. You can change which record is "current" by either double-clicking on that record or clicking on the Hierarchy link in the
drop-down menu that is available after each record. Also, in the Enhanced and Hierarchy versions of the classification browser, all but the last element of the hierarchy are links for walking up that paricularly hierarchy. For example, HD9000 displays the following hierarchy:

Industries. Land use. Labor -- Special industries and trades

These links take you up in the hierarchy. In this example, the Industries. Land use. Labor link would take you to HD28-9999.

In the case of the Hierarchy version of the classification browser, the last element of the hierarchy will often also be a link. These additional links allow you to move deeper into the classification hierarchy. If a term has not been turned into a link, it means that there are no further sub-topics under that one. For example:

Industries. Land use. Labor -- Special industries and trades

The Industries. Land use. Labor link will take you up one level in the hierarchy and the Special industries and trades will take you down one level.

Formatted Classification Data
This section of the screen displays one page of classification records at a time, indented according to their level in the classification hierarchy. The data may also contain tracings, references and table links. For example (at HD9000-9999):

   For high technology industries in general see HC79.H53 

Clicking on HC79.H53 would take you to that number. Other examples include:

HD9000-9019  Food supply. Produce trade TABLE H18 modified 
          Including agricultural industries in general
          Cf. HG6046-6051 Commodity futures  

In the Enhanced and Hierarchy versions of the classification browser, table links are placed on the classification topics instead of on the table number. For example:

HD9000-9019  Food supply. Produce trade TABLE H18 modified 

In this case clicking on Food supply. Produce trade would apply table H18.

If you are using the Hierarchy version of the classification browser, most of of the classification topics will be links. These links are used to move up and down in the hierarchy.

Table Modification Records

Note: This section only applies to the Enhanced and Hierarchy browsers.
When applying tables to classification numbers, there are cases when the entire table is not applicable and some of the table information is overridden. The overriding data comes from the area of classification which is applying the table. Any time this is the case, the table references will include the word modified. For example, here is the area around HD9000-9019 (notice TABLE H18 modified in the first line):
HD9000-9019  Food supply. Produce trade TABLE H18 modified 
          Including agricultural industries in general
          Cf. HG6046-6051 Commodity futures  
          Cf. UC700-705 Provisioning of armies  
       Inspection  
             Including food testing reagents industry
             Cf. TX501-597 Examination and analysis of food  
HD9000.9.A1         General works 
          By region or country see HD9000.9.A5-Z Provisioning of armies  
HD9000.9.A5-Z         By region or country, A-Z 
             United States
HD9000.9.U5A1-.U5A19               Periodicals. Societies. Serials 
HD9000.9.U5A6-.U5A69               Congresses 
HD9000.9.U5A7-.U5Z               General works 
HD9000.9.U6A-.U6Z               By region or state, A-Z 
In this case, all of the lines from the caption Inspection (HD9000.9.A-.Z) onwards happen to be table modification records. When Table 18 is applied, it will create records that have the same classification numbers as the table modification records. When this happens, the table modification records override the table records in the display and the table version of these records is not shown. In addition, the overriding records are displayed with a yellow background to indicate that they are table modification records. For example, this is what you would see if you clicked on Food supply. Produce trade, above:
HD9000.1  Periodicals. Societies. Serials 
          For manufacturer's associations formed with particular
          reference to labor questions, see HD6941-6948
(HD9000.2)  Yearbooks 
          see HD6941-6948
HD9000.3  Directories 
HD9000.4  Statistics, prices, etc. 
HD9000.5  General works. History 
          Including biography
HD9000.6  Public policy 
HD9000.65  Handbooks, manuals, etc. 
   Taxation
HD9000.8.A1      General works 
HD9000.8.A2-Z      By region or country, A-Z 
          Under each country:
  
       .xPeriodicals. Societies. Serials
       .x2General works
       .x3A-.x3ZLocal, A-Z
   Inspection  
          Including food testing reagents industry
          Cf. TX501-597 Examination and analysis of food  
HD9000.9.A1      General works 
       By region or country see HD9000.9.A5-Z Provisioning of armies  
HD9000.9.A5-Z      By region or country, A-Z 
          United States
HD9000.9.U5A1-.U5A19            Periodicals. Societies. Serials 
HD9000.9.U5A6-.U5A69            Congresses 
HD9000.9.U5A7-.U5Z            General works 
HD9000.9.U6A-.U6Z            By region or state, A-Z 
   By region or country
       United States
HD9001         Periodicals. Societies. Serials  

Classification Record Links
Every classification record and tracing in the classification browser is followed by a little white button (  ) which, when clicked, displays a drop-down menu of additional links. For example:

HD9000-9999        Special industries and trades 
The links can include:
ButtonAction
Dewey correlation ClassWeb includes bibliographic correlations between LC classification numbers and Dewey classification numbers. This link will display the Dewey classification numbers that are most often used with this LC classification number. Note: If this feature is of no interest to your users, you can remove this link from the drop-down menu by changing your account preferences.
Edit this record Only displayed for administrative users who have permission to edit this record.
Hierarchy Another way of selecting the current record and displaying its hierarchy.
LC subject correlation Displays LC subject headings that are most often used with this classification number.
LCSH 053 search Displays LC subject headings that contain this classification number in an 053 field in the subject record.
MARC record Displays this classification record with its MARC tags.
Notes Create or edit the local notes associated with this classification number.
OPAC(s) Displays one or more OPAC links for this classification number. Note: Customize your list of OPAC links on your account preferences page.

 

For accounts that are authorized to submit classification proposal requests, the drop-down menu may also include the following when using the proposal system:

ButtonAction
Modify or delete this proposal Displayed on any proposals that have been submitted by your account prior to being assigned to a weekly meeting to allow you to modify or delete your proposal.
Propose cancelling this number Create a proposal to cancel this classification number.
Propose a change to this record Create a proposal to modify this classification record.
Propose a new class number here Create a proposal for a new classification number using the current record as a starting point.
Propose a new reference here Create a proposal for a new tracing or reference at this place in classification.

Secondary Table Links
If you use the Standard classification browser, there will be cases where a secondary table is applied after taking a primary table link. An example is:

HF3221-4040.7        Other regions or countries TABLE H7 modified
When you click on the "TABLE H7 modified" link, many of the entries in table H7 will contain a secondary table link (a small index card with a green plus sign) after the white drop-down menu button. One example is:
H7 20.25        Saint Pierre and Miquelon Islands   

Clicking on the secondary table icon will display the appropriate secondary table based on the links you have taken to get to this point.


Locating a Classification Number
LC classification data comes from two sources: schedule and table records. Unless you use the Standard browser or else run into one of those rare cases where the automatic calculation feature cannot apply a table for you, you will not be working directly with table records. If you do need to work with table records, you must click on the Tables button at the top of the screen before inputting your table and/or class numbers.

When browsing for a LC classification number, the data that is returned will depend on which class browser you are using. For the Standard browser, you will be taken to the closest schedules record to the number (or range) you entered. The Enhanced and Hierarchy browsers will attempt to apply primary and secondary tables and return the nearest calculated number to your search value.


Schedule Records
When browsing for schedules records (either real or calculated), you input either a single classification number or a span (by separating the two numbers with a hyphen). Here are examples of single numbers:

HD9000
HD9000.9.A1
hd9000.9.a1
KFN45

Please note that you can use either upper or lower case characters when looking for classification numbers (i.e. "HD9000.9.A1" and "hd9000.9.a1" are equivalent).

Here are ways of inputting classification spans:

HD9000-HD9999
HD9000-9999
KFN1-KFN599
KFN1-599

When inputting a span, you can use the shorthand notation of dropping the leading text characters in the second number (i.e. "HD9000-9999" and "KFN1-599"). Also, please avoid using any spaces in a classification number unless they are actually part of the number. Spaces affect the sorting sequence and may send you to the wrong place.


Table Records
When browsing tables records, you must always include a table number in your request. If the table can be found, you will be restricted to that table while you are paging forwards and backwards. To work withn a diferent table, type in a different number.

Here are examples of table numbers without a class number or span (they will return the first page of the table):

H1
H16
KFA-KFZ
kfa-kfz

Note that you can use either upper or lower case characters when inputting a table number (both "KFA-KFZ" and "kfa-kfz" are equivalent).

If you want to get to a particular place in a table, you can add a class number or span to the table number (separated by a space). For example:

H1 15.25
H16 5.A-Z
KFA-KFZ 11.4.A-Z


How Classification Numbers are Sorted
Classification numbers are either a single number (like "HD9000") or a span (a range of numbers like "HD9000-HD9999"). The first number is sorted in ascending order but the second number is sorted in descending order (broader spans file before narrower ones and all spans file before individual class numbers).

Here is an example of sorted classification numbers:

KFN1-599
KFN1
KFN6-20
KFN6-10
KFN6
KFN7

A record that has a single classification number ("KFN1") as opposed to a span ("KFN1-599") will always sort after any others with the same first number.


Locating Class Numbers in the Standard Browser
When you input a single classification number (as opposed to a span of numbers separated by a hyphen) into the Standard browser, ClassWeb will return the broadest span that starts with that number (for example, "HF1" will return a page that starts with "HF1-6182"). If this is not what you want, you can add a hyphen to the end of a single classification number to indicate that you would prefer an individual class number. For example, to get to "HF1" instead of "HF1-6182", you would input:

HF1-


Locating Class Numbers in the Enhanced and Hierarchy Browsers
The Enhanced and Hierarchy browsers take the opposite approach to locating classification numbers. Using the number you input, they will apply primary and secondary tables to return the most specific classification record to your search value (for example, "HF1" will return a page starting with record "HF1" instead of "HF1-6182"). If you are inputting a single number (as opposed to a span) and you want to find the span that is associated with that number, you must add a hyphen to the end of your number to indicate your preference for a span. For example, to find "HF1-6182" (or the first span that starts with "HF1"), you would input:

HF1-

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