search_doffin

Search Norwegian public procurement notices on Doffin.

Signature: search_doffin(query: string, optional, default ''; types: list of string (comma-separated), optional, default None; statuses: list of string (comma-separated), optional, default None; contract_nature: list of string (comma-separated), optional, default None; cpv_codes: list of string (comma-separated), optional, default None; locations: list of string (comma-separated), optional, default None; buyer: list of string (comma-separated), optional, default None; winner: list of string (comma-separated), optional, default None; date_from: string, optional, default None; date_to: string, optional, default None; sort_by: string, optional, default 'RELEVANCE'; page: integer, optional, default 1; hits_per_page: integer, optional, default 10; include_placeholders: yes/no, optional, default False; limit: integer, items, optional, default 25; offset: integer, items, optional, default 0)

Direct GET

For navigating agents: open the HTML page with parameters in the URL. The result is fetched and displayed without screenshots or form filling.

Open this validated HTML GET URL

https://allemannsdata.com/wiki/kilder/doffin/search_doffin/?query=&types={types}&statuses={statuses}&contract_nature={contract_nature}&cpv_codes={cpv_codes}&locations={locations}&buyer={buyer}&winner={winner}&date_from={date_from}&date_to={date_to}&sort_by=RELEVANCE&page=1&hits_per_page=10&include_placeholders=false&limit=25&offset=0

Replace {query}, {types}, {statuses}, {contract_nature}, {cpv_codes}, {locations}, {buyer}, {winner}, {date_from}, {date_to}, {sort_by}, {page}, {hits_per_page}, {include_placeholders} with values. Remove unused optional parameters from the URL.

For software and dashboards: Read the operation descriptor. The JSON GET template is https://allemannsdata.com/wiki/api/v1/kilder/doffin/search_doffin?query=&types={types}&statuses={statuses}&contract_nature={contract_nature}&cpv_codes={cpv_codes}&locations={locations}&buyer={buyer}&winner={winner}&date_from={date_from}&date_to={date_to}&sort_by=RELEVANCE&page=1&hits_per_page=10&include_placeholders=false&limit=25&offset=0. Open this exact request as JSON.

ParameterRequirementJSON typeDescription
queryoptionalstringFree-text search (Norwegian or English), e.g. "IT-drift", "snørydding", "rammeavtale konsulent". Start here.
typesoptionalunionFilter by notice type. Parent types: PLANNING, COMPETITION, RESULT. Specific types: ANNOUNCEMENT_OF_COMPETITION, DYNAMIC_PURCHASING_SCHEME, QUALIFICATION_SCHEME, ANNOUNCEMENT_OF_INTENT, PRE_ANNOUNCEMENT, ADVISORY_NOTICE, NOTICE_ON_BUYER_PROFILE, ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT, CHANGE_OF_CONCLUSION_OF_CONTRACT, CANCELLED_OR_MISSING_CONCLUSION_OF_CONTRACT. Use ["COMPETITION"] + statuses=["ACTIVE"] for open tenders.
statusesoptionalunionACTIVE (open for bids), EXPIRED, AWARDED, CANCELLED.
contract_natureoptionalunionWORKS, SERVICES and/or SUPPLIES.
cpv_codesoptionalunion8-digit CPV codes, e.g. ["45000000"]. Matches the code and its children. Find codes with search_cpv_codes(). Best combined with a free-text query.
locationsoptionalunionNUTS-style location ids, e.g. ["NO060"] (Trøndelag), or "anyw" for non-location-bound. See list_location_codes().
buyeroptionalunionBuyer organization full name(s) exactly as written on notices, e.g. ["Trondheim kommune"]. Resolved to Doffin's internal buyer id via a free-text lookup; names that match no buyer are reported in "note" and, if none match, no results are returned (rather than an unfiltered search). Pass the 32-hex buyer id from a result's buyer field directly to skip the lookup.
winneroptionalunionDoffin's internal supplier id (32-hex). Winner names cannot be used - they are not present in search results to resolve against.
date_fromoptionalunionPublication date lower bound, "YYYY-MM-DD".
date_tooptionalunionPublication date upper bound, "YYYY-MM-DD".
sort_byoptionalstringRELEVANCE (default), PUBLICATION_DATE_DESC, PUBLICATION_DATE_ASC, DEADLINE, ESTIMATED_VALUE_ASC, ESTIMATED_VALUE_DESC.
pageoptionalinteger1-based page number.
hits_per_pageoptionalinteger1-50 (default 10).
include_placeholdersoptionalbooleanBy default, hits whose buyer fields look like unfilled eForm template values (org id 123456789, placeholder buyer names) are dropped from the results as junk. Set True to keep them, each flagged with "possible_placeholder": true.
limitoptionalintegerGateway page size; default 25, maximum 100.
offsetoptionalintegerNumber of list items to skip; default 0.
Generated JavaScript, Python and response structure

Use JSON when the user requests code, machine-readable data, value extraction or further computation. Use the HTML GET page to identify the correct source and verify parameters.

Example for generated JavaScript and Python

https://allemannsdata.com/wiki/api/v1/kilder/doffin/search_doffin?query=&types={types}&statuses={statuses}&contract_nature={contract_nature}&cpv_codes={cpv_codes}&locations={locations}&buyer={buyer}&winner={winner}&date_from={date_from}&date_to={date_to}&sort_by=RELEVANCE&page=1&hits_per_page=10&include_placeholders=false&limit=25&offset=0

Replace URL placeholders and remove unused optional parameters.

JavaScript in a dashboard

const url = "https://allemannsdata.com/wiki/api/v1/kilder/doffin/search_doffin?query=&types={types}&statuses={statuses}&contract_nature={contract_nature}&cpv_codes={cpv_codes}&locations={locations}&buyer={buyer}&winner={winner}&date_from={date_from}&date_to={date_to}&sort_by=RELEVANCE&page=1&hits_per_page=10&include_placeholders=false&limit=25&offset=0";
const response = await fetch(url);
if (!response.ok) {
  const failure = await response.json();
  throw new Error(`${failure.error.code}: ${failure.error.message} ${failure.suggestion}`);
}
const result = await response.json();
const data = result.data;

Python without additional packages

import json
from urllib.request import urlopen

url = "https://allemannsdata.com/wiki/api/v1/kilder/doffin/search_doffin?query=&types={types}&statuses={statuses}&contract_nature={contract_nature}&cpv_codes={cpv_codes}&locations={locations}&buyer={buyer}&winner={winner}&date_from={date_from}&date_to={date_to}&sort_by=RELEVANCE&page=1&hits_per_page=10&include_placeholders=false&limit=25&offset=0"
with urlopen(url) as response:
    result = json.load(response)
data = result["data"]

Response structure

{
  "source": "doffin",
  "operation": "search_doffin",
  "parameters": {},
  "data": {},
  "entities": [],
  "_meta": {"retrieved_at": "...", "sources": [], "cache": {}},
  "_links": {"self": "...", "source": "...", "wiki": "...", "feedback": "..."}
}
Form for manual use

The form is a fallback for people and browser agents that cannot open the GET URL directly.

Type: string. Free-text search (Norwegian or English), e.g. "IT-drift", "snørydding", "rammeavtale konsulent". Start here.
Type: list of string (comma-separated). Filter by notice type. Parent types: PLANNING, COMPETITION, RESULT. Specific types: ANNOUNCEMENT_OF_COMPETITION, DYNAMIC_PURCHASING_SCHEME, QUALIFICATION_SCHEME, ANNOUNCEMENT_OF_INTENT, PRE_ANNOUNCEMENT, ADVISORY_NOTICE, NOTICE_ON_BUYER_PROFILE, ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT, CHANGE_OF_CONCLUSION_OF_CONTRACT, CANCELLED_OR_MISSING_CONCLUSION_OF_CONTRACT. Use ["COMPETITION"] + statuses=["ACTIVE"] for open tenders.
Type: list of string (comma-separated). ACTIVE (open for bids), EXPIRED, AWARDED, CANCELLED.
Type: list of string (comma-separated). WORKS, SERVICES and/or SUPPLIES.
Type: list of string (comma-separated). 8-digit CPV codes, e.g. ["45000000"]. Matches the code and its children. Find codes with search_cpv_codes(). Best combined with a free-text query.
Type: list of string (comma-separated). NUTS-style location ids, e.g. ["NO060"] (Trøndelag), or "anyw" for non-location-bound. See list_location_codes().
Type: list of string (comma-separated). Buyer organization full name(s) exactly as written on notices, e.g. ["Trondheim kommune"]. Resolved to Doffin's internal buyer id via a free-text lookup; names that match no buyer are reported in "note" and, if none match, no results are returned (rather than an unfiltered search). Pass the 32-hex buyer id from a result's buyer field directly to skip the lookup.
Type: list of string (comma-separated). Doffin's internal supplier id (32-hex). Winner names cannot be used - they are not present in search results to resolve against.
Type: string. Publication date lower bound, "YYYY-MM-DD".
Type: string. Publication date upper bound, "YYYY-MM-DD".
Type: string. RELEVANCE (default), PUBLICATION_DATE_DESC, PUBLICATION_DATE_ASC, DEADLINE, ESTIMATED_VALUE_ASC, ESTIMATED_VALUE_DESC.
Type: integer. 1-based page number.
Type: integer. 1-50 (default 10).
Type: yes/no. By default, hits whose buyer fields look like unfilled eForm template values (org id 123456789, placeholder buyer names) are dropped from the results as junk. Set True to keep them, each flagged with "possible_placeholder": true.

Result

Source: Doffin and TED. Retrieved 2026-09-12T01:25:32Z in 0.185 seconds.

total_count:
5
hits:

5 results

  1. id:
    2023-353164
    buyer:

    1 results

    1. id:
      3902738a00c2bb29a8f959e570f7582f
      organization_id:
      939 958 851
      name:
      Stjørdal kommune
    heading:
    Ny vannledning Aurmyra-Vinge
    description:
    Stjørdal kommune skal legge ny vannledning på Skatval. Start i øst eksisterende kum ved kommunal veg Aurmyra, slutt i vest vannkum ved FV 6810 Auranvegen. Hovedtraseen følger dyrkajord langs FV 6810 Vinnnavegen. Eksisterende ledning er en ca 1555 m lang AS-ledning, 150 mm. Ny ledning skal være 160 mm PE. Grunnforhold: Kornåker, mye landbruksdrenering. Noen partier m/sensitiv leire. Det kreves styrt boring på noen strekninger, andre skal graves med grunn grøft. Arbeidet gjennomføres utenfor vekstsesongen.
    location_id:

    1 results

    1. NO060
    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2023-07-12T10:00:00Z
    deadline:
    2023-08-31T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2023-07-12
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  2. id:
    2023-609273
    buyer:

    1 results

    1. id:
      0cd55042ef7e87b7a3a6b51ce4f08742
      organization_id:
      921 707 134
      name:
      OFA - Konkurranseportal
    heading:
    Hotelltjenester - Kurs- konferansetjenester og hotellovernatting
    description:
    Oppdragsgiver ønsker å inngå parallelle rammeavtaler på kurs-, konferansetjenester, hotellovernatting i Agder fylke. Avtalene skal sikre god dekning og kvalitet i forhold til oppdragsgivers behov for hotellovernatting, gjennomføring av kurs- og konferanser m/eventuelle eventer/«blåturer». For å tilby tjenester i en sone må man fysisk ha et hotell/konferansested i den sonen man leverer tilbud i. Det gis anledning for en leverandør som har hotell/konferansested i flere soner å inngå tilbud i flere soner.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    allTypes:

    2 results

    1. ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    2. RESULT
    status:
    not reported by source
    issueDate:
    2023-04-13T10:00:00Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2023-04-13
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  3. id:
    2022-956390
    buyer:

    1 results

    1. id:
      0cd55042ef7e87b7a3a6b51ce4f08742
      organization_id:
      921 707 134
      name:
      OFA - Konkurranseportal
    heading:
    Hotelltjenester - Kurs- konferansetjenester og hotellovernatting
    description:
    Oppdragsgiver ønsker å inngå parallelle rammeavtaler på kurs-, konferansetjenester, hotellovernatting i Agder fylke. Avtalene skal sikre god dekning og kvalitet i forhold til oppdragsgivers behov for hotellovernatting, gjennomføring av kurs- og konferanser m/eventuelle eventer/«blåturer». For å tilby tjenester i en sone må man fysisk ha et hotell/konferansested i den sonen man leverer tilbud i. Det gis anledning for en leverandør som har hotell/konferansested i flere soner å inngå tilbud i flere soner.
    location_id:

    1 results

    1. NO09
    estimatedValue:
    currencyCode:
    NOK
    amount:
    104000000.0
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2022-11-16T10:00:00Z
    deadline:
    2022-12-19T10:00:00Z
    sentToTed:
    yes
    publicationDate:
    2022-11-16
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  4. id:
    2018-245855
    buyer:

    2 results

    1. id:
      3a706206f54ae960695997d1e07f0e31
      organization_id:
      940155223
      name:
      Gjøvikregionen - Anskaffelser
    2. id:
      74c71010c97bcceffaff29d7e6860f8c
      organization_id:
      940155223
      name:
      Gjøvik kommue
    heading:
    218563 - Biri Omsorgssenter - Riving eksisterende bygningsmasse
    description:
    På oppdrag fra Gjøvik Kommune har Sweco Norge AS i samarbeide med Anskaffelser Fellesenhet Gjøvikregionen utarbeidet vedlagte kravspesifikasjon som grunnlag for kontrahering av totalentreprenør på rivearbeider. Kontraktsarbeidene omfatter riving av eksisterende bygningsmasse ved Biri Omsorgssenter. Tilbudsbefaring avholdes: 08.08.2018 kl. 12:00 Plass for fremmøte: Biri omsorgssenter. Birivegen 53, 2836 Biri.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2018-06-29T10:00:00Z
    deadline:
    2018-08-30T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2018-06-29
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  5. id:
    2020-379510
    buyer:

    1 results

    1. id:
      22fce3d499a58e638d4e74e8b5fcae3d
      organization_id:
      922530890
      name:
      Øygarden kommune (nye)
    heading:
    Rammeavtaler om handverkar- og entreprenørtenester
    description:
    Øygarden kommune innbyr med dette til open anbodskonkurranse for etablering av rammeavtalar for entreprenør- og handverkartenester innan for forskjellige fagområder. Oppdragsgivar har behov for handverkartenester i samband med drift og vedlikehald av bygg og vegar som kommunen eig. Dei enkelte oppdraga sin karakter og omfang vil kunne variere, men hovudfokus vil vere på service, drift og vedlikehald av kommunen sine bygg og vegar. Anskaffinga er delt inn i 9 delkontrakter/avtaleområdar. Fullstendig skildring av leveransen følgjer av del II bilag 1 Oppdragsgivar sin kravspesifikasjon.
    location_id:

    1 results

    1. NO0A2
    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    allTypes:

    3 results

    1. CANCELLED_OR_MISSING_CONCLUSION_OF_CONTRACT
    2. ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    3. RESULT
    status:
    not reported by source
    issueDate:
    2020-10-29T10:00:00Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2020-10-29
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

limit:
25
offset:
0
returned:
5
has_more_results:
no
truncated:
no
Show all fields in HTML
total_count:
5
hits:

5 results

  1. id:
    2023-353164
    buyer:

    1 results

    1. id:
      3902738a00c2bb29a8f959e570f7582f
      organization_id:
      939 958 851
      name:
      Stjørdal kommune
    heading:
    Ny vannledning Aurmyra-Vinge
    description:
    Stjørdal kommune skal legge ny vannledning på Skatval. Start i øst eksisterende kum ved kommunal veg Aurmyra, slutt i vest vannkum ved FV 6810 Auranvegen. Hovedtraseen følger dyrkajord langs FV 6810 Vinnnavegen. Eksisterende ledning er en ca 1555 m lang AS-ledning, 150 mm. Ny ledning skal være 160 mm PE. Grunnforhold: Kornåker, mye landbruksdrenering. Noen partier m/sensitiv leire. Det kreves styrt boring på noen strekninger, andre skal graves med grunn grøft. Arbeidet gjennomføres utenfor vekstsesongen.
    location_id:

    1 results

    1. NO060
    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2023-07-12T10:00:00Z
    deadline:
    2023-08-31T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2023-07-12
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  2. id:
    2023-609273
    buyer:

    1 results

    1. id:
      0cd55042ef7e87b7a3a6b51ce4f08742
      organization_id:
      921 707 134
      name:
      OFA - Konkurranseportal
    heading:
    Hotelltjenester - Kurs- konferansetjenester og hotellovernatting
    description:
    Oppdragsgiver ønsker å inngå parallelle rammeavtaler på kurs-, konferansetjenester, hotellovernatting i Agder fylke. Avtalene skal sikre god dekning og kvalitet i forhold til oppdragsgivers behov for hotellovernatting, gjennomføring av kurs- og konferanser m/eventuelle eventer/«blåturer». For å tilby tjenester i en sone må man fysisk ha et hotell/konferansested i den sonen man leverer tilbud i. Det gis anledning for en leverandør som har hotell/konferansested i flere soner å inngå tilbud i flere soner.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    allTypes:

    2 results

    1. ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    2. RESULT
    status:
    not reported by source
    issueDate:
    2023-04-13T10:00:00Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2023-04-13
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  3. id:
    2022-956390
    buyer:

    1 results

    1. id:
      0cd55042ef7e87b7a3a6b51ce4f08742
      organization_id:
      921 707 134
      name:
      OFA - Konkurranseportal
    heading:
    Hotelltjenester - Kurs- konferansetjenester og hotellovernatting
    description:
    Oppdragsgiver ønsker å inngå parallelle rammeavtaler på kurs-, konferansetjenester, hotellovernatting i Agder fylke. Avtalene skal sikre god dekning og kvalitet i forhold til oppdragsgivers behov for hotellovernatting, gjennomføring av kurs- og konferanser m/eventuelle eventer/«blåturer». For å tilby tjenester i en sone må man fysisk ha et hotell/konferansested i den sonen man leverer tilbud i. Det gis anledning for en leverandør som har hotell/konferansested i flere soner å inngå tilbud i flere soner.
    location_id:

    1 results

    1. NO09
    estimatedValue:
    currencyCode:
    NOK
    amount:
    104000000.0
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2022-11-16T10:00:00Z
    deadline:
    2022-12-19T10:00:00Z
    sentToTed:
    yes
    publicationDate:
    2022-11-16
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  4. id:
    2018-245855
    buyer:

    2 results

    1. id:
      3a706206f54ae960695997d1e07f0e31
      organization_id:
      940155223
      name:
      Gjøvikregionen - Anskaffelser
    2. id:
      74c71010c97bcceffaff29d7e6860f8c
      organization_id:
      940155223
      name:
      Gjøvik kommue
    heading:
    218563 - Biri Omsorgssenter - Riving eksisterende bygningsmasse
    description:
    På oppdrag fra Gjøvik Kommune har Sweco Norge AS i samarbeide med Anskaffelser Fellesenhet Gjøvikregionen utarbeidet vedlagte kravspesifikasjon som grunnlag for kontrahering av totalentreprenør på rivearbeider. Kontraktsarbeidene omfatter riving av eksisterende bygningsmasse ved Biri Omsorgssenter. Tilbudsbefaring avholdes: 08.08.2018 kl. 12:00 Plass for fremmøte: Biri omsorgssenter. Birivegen 53, 2836 Biri.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2018-06-29T10:00:00Z
    deadline:
    2018-08-30T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2018-06-29
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  5. id:
    2020-379510
    buyer:

    1 results

    1. id:
      22fce3d499a58e638d4e74e8b5fcae3d
      organization_id:
      922530890
      name:
      Øygarden kommune (nye)
    heading:
    Rammeavtaler om handverkar- og entreprenørtenester
    description:
    Øygarden kommune innbyr med dette til open anbodskonkurranse for etablering av rammeavtalar for entreprenør- og handverkartenester innan for forskjellige fagområder. Oppdragsgivar har behov for handverkartenester i samband med drift og vedlikehald av bygg og vegar som kommunen eig. Dei enkelte oppdraga sin karakter og omfang vil kunne variere, men hovudfokus vil vere på service, drift og vedlikehald av kommunen sine bygg og vegar. Anskaffinga er delt inn i 9 delkontrakter/avtaleområdar. Fullstendig skildring av leveransen følgjer av del II bilag 1 Oppdragsgivar sin kravspesifikasjon.
    location_id:

    1 results

    1. NO0A2
    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    allTypes:

    3 results

    1. CANCELLED_OR_MISSING_CONCLUSION_OF_CONTRACT
    2. ANNOUNCEMENT_OF_CONCLUSION_OF_CONTRACT
    3. RESULT
    status:
    not reported by source
    issueDate:
    2020-10-29T10:00:00Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2020-10-29
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

limit:
25
offset:
0
returned:
5
has_more_results:
no
truncated:
no
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How an AI agent should use this page

Ground rule: Navigate with HTML GET links to keep explanations and relationships. Use the page's JSON alternative only when concrete values must be extracted, compared or computed.

How to use the search_doffin lookup

  1. Replace the placeholders in the HTML GET template; remove optional parameters you do not need.
  2. Check types, units, limits and ID formats in the parameter table.
  3. Follow linked results to canonical pages before combining sources.

Misreading to avoid: An empty list means "no results for this lookup". An error message or unavailable source does not mean the data does not exist.

Source-specific next step

Go to the source page for other operations. Use the JSON template only after the HTML result shows that the parameters and source are correct.