====== 801 Originating Source (O;R) ======



==== Field Definition and Scope ====
This field contains an indication of the origin of all or part of the data contained in the record. It gives the identifier of the source record and the agency, who owns the source record.

==== Application of Content Designators ====
\\
=== Indicators ===
**Indicator 1: undefined (blank)** 

**Indicator 2: undefined (blank)** 

=== Subfields ===
**$a Country (M;NR)**\\
A two-letter country code according to [[http://www.iso.org/iso/country_codes/iso_3166_code_lists/english_country_names_and_code_elements.htm|ISO 3166-1]]

**$b Agency/Source file (M;NR)**\\
A code according to the [[code list for source files]].

**$c Date of last transaction (O;NR)**\\
The date of the last change applied to the record in its original environment. This is needed for an update of the data. The prescribed format is: yyyymmdd

**$g Cataloguing rules (O;R)**\\
(Descriptive Conventions) e.g. AACR2

**$n Identification number of original cataloguing agency (M;NR)**\\
The original record identifier


==== Input Conventions ====
This field is typically created in an offline conversion process, when records from other external sources are integrated into the CERL Thesaurus. Thus, although manual input of this field is permitted, it will rarely be used by editors.

Records that have been created in the CERL Thesaurus usually do not have a field 801, unless they have been merged to existing records from other source files. This field should only be used to indicate that a record from an external file is the source or one of the sources for the given record. It should not be used to indicate that an external record describe the same entity or resource as the given record.

If a source fiele does not provied a date of last change, the data of data delivery is used in subfield $c.

==== Mapping ====
For the export to RDF, the following mapping is applied
|$a, $b, $n|rdaGr2:IdentifierForThePerson|//currently only for $aDE$bPND//|


  * rdaGr2 represents the namespace "http://rdvocab.info/ElementsGr2/"
  * The RDA ontologies are registerd with the open metadata registry ([[http://metadataregistry.org/schemaprop/show/id/1141.html]])

<code>
<rdf:Description rdf:about="http://thesaurus.cerl.org/record/cnp01292879">
  <rdaGr2:identifierForThePerson>(DE-588)1012384756</rdaGr2:identifierForThePerson>
</rdf:Description>
</code>
==== Examples ====

  - 801 ##$aNL$bNeNKHB$c19950725$n07553827X

==== Internal Representation ====
<code javascript>
{"data": {"external": [{
    "country": "Country ($a)",
    "auth": "Cataloguing agency ($b)",
    "date": "Date of last transaction ($c)",
    "id": "Record ID ($n)",
    "catRules": "Cataloguing Rules ($g)"
}]}}
</code>


==== Change History ====
  * //17.07.2017//: First and second indicator position will no longer be supported, once the CT is migrated into its new environment
  * //17.07.2017//: Subfield $2 will no longer be supported, once the CT is migrated into its new environment
  * //17.07.2017//: Subfield $6 will no longer be supported, once the CT is migrated into its new environment