Class Name: Keywords

Superclass - <SEDRIS Abstract Base>

Subclasses

Definition

An instance of this DRM class specifies keywords, as well as their type and reference source, for the containing SEDRIS object.

Primary Page in DRM Diagram:

• 20

Secondary Pages in DRM Diagram:

Example

1. Consider a <Model> representing an F18C aircraft, such that the <Model> contains a <Description> instance with a <Keywords> instance specified in U.S. English, in order to support keyword searches on the type of aircraft. The <Keywords> instance has the following structure:
   
   

   <Keywords>
   keyword_count	1
   keyword_array[0]	{ SE_LOCALE_DEFAULT, 4, "F18C" }
   type	SE_KEYWORD_THEME

2. Consider a transmittal containing a terrain dataset representing roads and lakes located at Fort Hood, Texas. The source dataset has a [ISO 19115] metadata record containing keyword information for the entire transmittal.

   The following <Keywords> instances, defined in U.S. English, is attached to <Description>, which is attached to the <Transmittal Root> to transmit this information as follows.

   <Keywords>
   keyword_count	2
   keyword_array[0]	{ SE_LOCALE_DEFAULT, 9, "Fort Hood" }
   keyword_array[1]	{ SE_LOCALE_DEFAULT, 5, "Texas" }
   type	SE_KEYWORD_PLACE
   <>
   |
   <Citation>
   title	{ SE_LOCALE_DEFAULT, 22, "MEL_Location_Thesaurus" }
   edition	{ empty_string }
   series_name	{ empty_string }
   issue_identification	{ empty_string }
   other_citation_details	{ empty_string }
   <>
   |
   <Responsible_Party>	(for MEL thesauri)

   
   
   

   <Keywords>
   keyword_count	2
   keyword_array[0]	{ SE_LOCALE_DEFAULT, 11, "Cartography" }
   keyword_array[1]	{ SE_LOCALE_DEFAULT, 7, "Mapping" }
   type	SE_KEYWORD_THEME
   <>
   |
   <Citation>
   title	{ SE_LOCALE_DEFAULT, 42, "MEL_Scientific-Engineering_Field_Thesaurus" }
   edition	{ empty_string }
   series_name	{ empty_string }
   issue_identification	{ empty_string }
   other_citation_details	{ empty_string }
   <>
   |
   <Responsible_Party>	(for MEL thesauri, shared)

FAQs

What is the purpose of this class?

This DRM class provides a mechanism for specifying ISO 19115-compliant keywords, which can be used to search a repository (such as MEL) for SEDRIS transmittals that address specified real-world objects, spatial locations, or time periods. This allows a potential user to identify and select those SEDRIS transmittals that meet their requirements, without having to actually obtain and examine the transmittals themselves.

Consider a data provider who has keywords to populate a <Keywords> instance, but is unable to determine which SE_Keyword_Type_Code should be used to classify a particular keyword. What procedure is suggested for such a data provider?

If no more appropriate SE_Keyword_Type_Codes can be determined, SE_KEYWORD_THEME is suggested.

Constraints

• <<Publishable Object>>
• <<Mandatory Metadata>>

Composed of (two-way metadata)

• zero or one <Citation> instance (notes)

Component of (two-way)

• one or more <Description> instances

Inherited Field Elements

Field Elements

Notes

Composed of Notes

Citation

 If provided, this identifies the formally registered
 thesaurus (or a similar authoritative source of keywords)
 from which the entries of keyword_array were drawn.

Fields Notes

keyword_count

 The keyword_count field specifies the number of entries in
 keyword_array.

keyword_array

 Each entry of the keyword_array field is a commonly used word
 or a formalized word or phrase used to describe the
 subject.

type

 The type field specifies the subject matter used to group
 similar keywords in the given instance of <Keywords>.