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 2026-10-29T08:59:52Z in 0.835 seconds.

total_count:
5
hits:

5 results

  1. id:
    2019-375175
    buyer:

    1 results

    1. id:
      c9602d9b8d09c473f85020f736068ed1
      organization_id:
      979 364 857
      name:
      COWI AS Larvik
    heading:
    Sørby-Virik, Infrastruktur
    description:
    Det er planlagt et nytt boligfelt på Sørby-Virik i Sandefjord, totalt skal det her på sikt bygges rundt 800 boenheter. Dette anbudet omhandler etappe 1 av denne utbyggingen og omfatter et område på ca. 10 hektar, hvor det skal bygges omlag 300 boenheter. Etappe 1 består kommunalteknisk sett av nye veier, GS-veier og fortau, VA-anlegg med system for overvannshåndtering, og nytt el-/fiberanlegg og gatebelysning. Det skal også gjøres jobb på eksisterende veier som blir berørt av utbyggingen. Krysset Krokemoaveien-Olympiaveien er sentralt, da det er her adkomsten til det nye boligfeltet skal ligge. Dette krysset skal utvides og etableres med nytt fortau.
    location_id:

    1 results

    1. anyw
    estimatedValue:
    currencyCode:
    NOK
    amount:
    25000000.0
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2019-07-05T10:00:00Z
    deadline:
    2019-08-23T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2019-07-05
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  2. id:
    2018-531577
    buyer:

    1 results

    1. id:
      c9602d9b8d09c473f85020f736068ed1
      organization_id:
      979 364 857
      name:
      COWI AS Larvik
    heading:
    VA-Rehabilitering Sildreveien
    description:
    Prosjektet har hensikt å skifte ut eksisterende ledningsnett for VVA i Sildreveien. Følgende nye ledninger skal legges: Vannledning; DN100 SJK – 104 meter Vannledning; DN150 SJK – 102 meter Spillvannsledning; DN250 PVC – 104 meter Spillvannsledning; DN250 PVC – 105 meter Overvannsledning; DN250 PVC – 209 meter I tillegg kommer etablering av tilhørende kummer og sandfang. Veien som traséen går i skal rehabiliteres til sin opprinnelige stand og berørte eiendommer og hager skal istandsettes.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    not reported by source
    issueDate:
    2018-04-11T10:00:00Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2018-04-11
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  3. id:
    2017-733570
    buyer:

    1 results

    1. id:
      c9602d9b8d09c473f85020f736068ed1
      organization_id:
      979 364 857
      name:
      COWI AS Larvik
    heading:
    Steffensens vei, VA-anlegg
    description:
    Separering av eksisterende ledningsnett. Ca. 1100 meter, med vann (DN150/100) -, spill (DN160/200) - og overvannsledninger (DN200/250). Det skal settes ned 7 prefabrikkerte vannkummer, 11 nedstigningskummer for spill-/overvann, og 15 inspeksjonskummer for spill-/overvann. Det skal også settes ned 9 stykk sandfang. Kabelgrøfter, ca. 1300 meter. Anlegget går i veiareal som skal istandsettes (asfalt ca. 6200kvm).
    location_id:

    No results.

    estimatedValue:
    currencyCode:
    NOK
    amount:
    10000000.0
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2017-11-03T10:00:00Z
    deadline:
    2017-12-04T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2017-11-03
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  4. id:
    2017-517597
    buyer:

    1 results

    1. id:
      c9602d9b8d09c473f85020f736068ed1
      organization_id:
      979 364 857
      name:
      COWI AS Larvik
    heading:
    Harald Bjerkes gate - Bjørn Evjes gate, VVA-anlegg utførelsesfase 2
    description:
    VA-anlegget i Harald Bjerkes gate og Bjørn Evjes gate skal rehabiliteres. Dette inkluderer også gjennoppbygning av veien traséen skal gå i. Anlegg er tilsammen ca. 300 meter langt. Følgende arbeider skal utføres: Ny vannledning, DN150 SJK - 300 meter Ny spillvannsledning, DN160 PVC - 250 meter Ny overvannsledning, DN250 PVC - 300 meter Ny drensledning, DN160 DV - 300 meter Etablering av 1stk vannkum, 4 stk OV-kummer, 3 stk SP-kummer Etablering av 10 stk sluk/sandfang for drenering av vei Gjennoppbygging av vei Etablering av nytt gatelys Oppdatering av eks. kabelføring; høyspent/lavspent/signal
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    not reported by source
    issueDate:
    2017-01-26T10:00:00Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2017-01-26
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  5. id:
    2022-963562
    buyer:

    1 results

    1. id:
      ed8a6e8e188af72a6a35b9bc2084b129
      organization_id:
      918082956
      name:
      Larvik kommune
    heading:
    22/6218 - Grunnundersøkelser ifm utvidelse av Lillevik RA
    description:
    Larvik kommunes avløpsrenseanlegg Lillevik RA skal utvides. Det er utarbeidet forprosjekt hvor det er utredet 3 alternative løsninger. Valg av løsning vil bli behandlet i politiske møter vinter 22/23. Geoteknisk bistand skal basere seg på de alternativene som er beskrevet i forprosjektrapport, september 22, utarbeidet av Cowi AS. Eksisterende bygningsmasse skal utvides mot øst med 2 haller med bassenger, og mot sør skal det oppføres nytt servicebygg, eller i ett av alternativene skal servicebygget være innebygd med bassengene. Den planlagte utbyggingen ligger i vestre kant av en registrert faresone for mulig skred i kvikkleire ned mot Larviksfjorden i øst.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    not reported by source
    issueDate:
    2022-09-28T10:00:00Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2022-09-28
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

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

5 results

  1. id:
    2019-375175
    buyer:

    1 results

    1. id:
      c9602d9b8d09c473f85020f736068ed1
      organization_id:
      979 364 857
      name:
      COWI AS Larvik
    heading:
    Sørby-Virik, Infrastruktur
    description:
    Det er planlagt et nytt boligfelt på Sørby-Virik i Sandefjord, totalt skal det her på sikt bygges rundt 800 boenheter. Dette anbudet omhandler etappe 1 av denne utbyggingen og omfatter et område på ca. 10 hektar, hvor det skal bygges omlag 300 boenheter. Etappe 1 består kommunalteknisk sett av nye veier, GS-veier og fortau, VA-anlegg med system for overvannshåndtering, og nytt el-/fiberanlegg og gatebelysning. Det skal også gjøres jobb på eksisterende veier som blir berørt av utbyggingen. Krysset Krokemoaveien-Olympiaveien er sentralt, da det er her adkomsten til det nye boligfeltet skal ligge. Dette krysset skal utvides og etableres med nytt fortau.
    location_id:

    1 results

    1. anyw
    estimatedValue:
    currencyCode:
    NOK
    amount:
    25000000.0
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2019-07-05T10:00:00Z
    deadline:
    2019-08-23T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2019-07-05
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  2. id:
    2018-531577
    buyer:

    1 results

    1. id:
      c9602d9b8d09c473f85020f736068ed1
      organization_id:
      979 364 857
      name:
      COWI AS Larvik
    heading:
    VA-Rehabilitering Sildreveien
    description:
    Prosjektet har hensikt å skifte ut eksisterende ledningsnett for VVA i Sildreveien. Følgende nye ledninger skal legges: Vannledning; DN100 SJK – 104 meter Vannledning; DN150 SJK – 102 meter Spillvannsledning; DN250 PVC – 104 meter Spillvannsledning; DN250 PVC – 105 meter Overvannsledning; DN250 PVC – 209 meter I tillegg kommer etablering av tilhørende kummer og sandfang. Veien som traséen går i skal rehabiliteres til sin opprinnelige stand og berørte eiendommer og hager skal istandsettes.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    not reported by source
    issueDate:
    2018-04-11T10:00:00Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2018-04-11
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  3. id:
    2017-733570
    buyer:

    1 results

    1. id:
      c9602d9b8d09c473f85020f736068ed1
      organization_id:
      979 364 857
      name:
      COWI AS Larvik
    heading:
    Steffensens vei, VA-anlegg
    description:
    Separering av eksisterende ledningsnett. Ca. 1100 meter, med vann (DN150/100) -, spill (DN160/200) - og overvannsledninger (DN200/250). Det skal settes ned 7 prefabrikkerte vannkummer, 11 nedstigningskummer for spill-/overvann, og 15 inspeksjonskummer for spill-/overvann. Det skal også settes ned 9 stykk sandfang. Kabelgrøfter, ca. 1300 meter. Anlegget går i veiareal som skal istandsettes (asfalt ca. 6200kvm).
    location_id:

    No results.

    estimatedValue:
    currencyCode:
    NOK
    amount:
    10000000.0
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    EXPIRED
    issueDate:
    2017-11-03T10:00:00Z
    deadline:
    2017-12-04T10:00:00Z
    sentToTed:
    no
    publicationDate:
    2017-11-03
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  4. id:
    2017-517597
    buyer:

    1 results

    1. id:
      c9602d9b8d09c473f85020f736068ed1
      organization_id:
      979 364 857
      name:
      COWI AS Larvik
    heading:
    Harald Bjerkes gate - Bjørn Evjes gate, VVA-anlegg utførelsesfase 2
    description:
    VA-anlegget i Harald Bjerkes gate og Bjørn Evjes gate skal rehabiliteres. Dette inkluderer også gjennoppbygning av veien traséen skal gå i. Anlegg er tilsammen ca. 300 meter langt. Følgende arbeider skal utføres: Ny vannledning, DN150 SJK - 300 meter Ny spillvannsledning, DN160 PVC - 250 meter Ny overvannsledning, DN250 PVC - 300 meter Ny drensledning, DN160 DV - 300 meter Etablering av 1stk vannkum, 4 stk OV-kummer, 3 stk SP-kummer Etablering av 10 stk sluk/sandfang for drenering av vei Gjennoppbygging av vei Etablering av nytt gatelys Oppdatering av eks. kabelføring; høyspent/lavspent/signal
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    not reported by source
    issueDate:
    2017-01-26T10:00:00Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2017-01-26
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

  5. id:
    2022-963562
    buyer:

    1 results

    1. id:
      ed8a6e8e188af72a6a35b9bc2084b129
      organization_id:
      918082956
      name:
      Larvik kommune
    heading:
    22/6218 - Grunnundersøkelser ifm utvidelse av Lillevik RA
    description:
    Larvik kommunes avløpsrenseanlegg Lillevik RA skal utvides. Det er utarbeidet forprosjekt hvor det er utredet 3 alternative løsninger. Valg av løsning vil bli behandlet i politiske møter vinter 22/23. Geoteknisk bistand skal basere seg på de alternativene som er beskrevet i forprosjektrapport, september 22, utarbeidet av Cowi AS. Eksisterende bygningsmasse skal utvides mot øst med 2 haller med bassenger, og mot sør skal det oppføres nytt servicebygg, eller i ett av alternativene skal servicebygget være innebygd med bassengene. Den planlagte utbyggingen ligger i vestre kant av en registrert faresone for mulig skred i kvikkleire ned mot Larviksfjorden i øst.
    location_id:

    No results.

    estimatedValue:
    not reported by source
    type:
    ANNOUNCEMENT_OF_COMPETITION
    allTypes:

    2 results

    1. COMPETITION
    2. ANNOUNCEMENT_OF_COMPETITION
    status:
    not reported by source
    issueDate:
    2022-09-28T10:00:00Z
    deadline:
    not reported by source
    sentToTed:
    yes
    publicationDate:
    2022-09-28
    placeOfPerformance:

    No results.

    procurementStrategicLabels:

    No results.

limit:
25
offset:
0
returned:
5
has_more_results:
no
Will you use the result in generated code?

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Continue exploring

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.