Syntactic indexing

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The syntactic or structured indexing is a method of indexing text for the information retrieval , in which the language ( syntax ) relationships between descriptors are indicated.


The co- ordinating indexing (coordinative indexing) takes no account of this type of relationship; the words required for indexing are strung together without identifying their logical connection.

This type of indexing makes it difficult or impossible to see the connection between the descriptors. For this reason, various methods for representing the syntactic relationships have been developed over time.

The representation of the relationships in the syntactic indexing pursues the goal of reproducing the respective subject matter as precisely and as completely as possible.

to form

Strings of descriptors

When indexing, several descriptors for each subject are combined into a descriptor or keyword chain. The first descriptor typically represents an object or an appearance, while the following descriptors define properties of the first descriptor in more detail.

Example: electrical conductivity and heat resistance of titanium alloys
1. Descriptor chain: titanium alloy , conductivity , electrical
2. Descriptor chain: titanium alloy , heat resistance

The use of keyword chains is specified , for example, in the rules for the keyword catalog (RSWK).

Connection indicator

When using connection or link indicators (also coupling indicators), numbers in brackets usually indicate which descriptors are related in terms of content.

Example: Coating steel pipes with zinc
Descriptors with connection indicator : plating (1), steel (2) pipes (2), zinc (1)

Function descriptor

A function descriptor or role indicator is a qualifier that further defines the role of a descriptor. For example, steel can function as a starting product, intermediate product and end product. With "steel" as the content descriptor, the following descriptors, for example, can be put together by adding function descriptors:

  • Steel (as a starting product)
  • Steel (as an intermediate product)
  • Steel (as end product)

Position assignment

To perform certain functions to bring a descriptor expressed, can the order of Deskriptorenketten also use it as the order of the descriptors within these chains. They are to be understood like database fields within a descriptor data set. The following scheme serves as an example:

  1. Logical subject of the action
  2. Features of the subject of the action
  3. action
  4. Character (features) of the plot
  5. Time of action
  6. Place of action
  7. Object of action
  8. Features of the object of the plot
  9. Aim of the action
  10. Characteristic of the goal of the action
  11. Result of the action
  12. Characteristic of the result of the action
  13. Features of the place of the action
  14. Type (method) of action
  15. Conditions of the act

Such a scheme is particularly applicable in the technical field.

See also