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A single starting point to find the method, source or situation relevant to your question.

Find a method for your task

All words must match, regardless of case or accents. Search stays in the selected language.

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Guide
Working translation
Translation prepared for analysis or reading, distinct from a publisher-issued version. It links to the original and explains ambiguous terms.
Guide
Financial authorisation
Competent authority permission for a defined scope. It validates neither every product nor a contact copying an authorised entity’s name.
Guide
Data grain
Object and level represented by one row. Grain determines keys and valid aggregation: company, establishment and transaction differ.
Guide
Join cardinality
Number of matching rows between tables: one-to-one, many-to-one or many-to-many. Row multiplication can change totals.
Guide
UTC
Time reference for expressing an instant. UTC conversion needs a known offset; it does not certify the source clock.
Guide
Calendar date
A calendar day without an implied time or offset. Converting it to midnight UTC adds unsupported precision.
Guide
UTC offset
Difference between local time and UTC at an instant. A fixed offset does not describe every rule of an IANA zone.
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M49
UN Statistics Division classification of countries or areas and statistical groupings. Its codes contain no geometry.
Guide
Constant prices
Amounts expressed at a reference price basis to separate price change. Method and index must suit the variable; currency conversion is insufficient.
Guide
Statistical suppression
Withholding a value to protect statistical information. A suppressed cell is not zero; retain its status and respect the protection.
Guide
SDMX
Standard for statistical data and metadata exchange. Producer structures define dimensions, codes and attributes; a shared standard does not guarantee identical methods.
Guide
DSD
Data Structure Definition: SDMX structure describing dimensions, measures and attributes. Dimension order helps interpret series keys.
Guide
DCAT
W3C vocabulary describing catalogues, datasets, distributions and data services. It makes relationships explicit without certifying quality or availability.
Guide
Catalogue record
Description of a resource’s registration in a catalogue. Its modification date may differ from that of the described dataset or file.
Guide
GeoJSON
JSON format for geographic geometries and features. RFC 7946 uses WGS 84 in degrees, ordered longitude then latitude.
Guide
Coordinate reference system
System giving meaning to coordinates, axes and units. Identify reference systems and transformations before comparing numeric pairs.
Guide
Check digit
Character or digits calculated from an identifier to detect some copying errors. A coherent check proves neither assignment nor identity.
Guide
ISBN-13
Thirteen-digit publication identifier starting with 978 or 979, with weighted modulus-10 check. Verify edition and format; arithmetic does not verify allocated ranges.
Guide
ISSN
Eight-character identifier of a continuing resource, ending with a check digit or X. ISSN assignment does not guarantee content quality.
Guide
Soft 404
A page returned with a success status, usually 200, whose content signals absence or an error. Status alone therefore does not prove that the expected resource was served.
Guide
Sampling frame
The list or mechanism used to select units from a population. Record what it covers and omits: random selection from an incomplete list does not correct its coverage error.
Guide
HTTP 202 — request accepted
A response indicating that a request was accepted for processing, without confirming completion or eventual success. Keep the offered monitoring mechanism rather than concluding from this code alone.
Guide
CSV dialect
A table’s delimiter, quoting, encoding and header conventions. Establish them before counting cells or interpreting values.
Guide
Exact duplicate
A record whose values all match another record. It differs from a repeated key; deletion requires knowing the intended grain.

Choose a starting point

Choose a method

Start from a task: verify, compare, document or decide.

Check a source

Examine the origin, date, scope and limits of information.

Understand a term

Find definitions before applying a protocol.

How can I refine the search?

Start with the topic: Enter one or two specific terms: citation, CSV or provenance. Every word must be present, so a long sentence can exclude useful pages.
Broaden before filtering: Search all families first. Then select a guide, protocol or source according to the kind of answer you need.
Try different wording: Try a synonym or a term in the selected language. Quotes, OR and asterisks are not search operators.

DEEPER READING / PRACTICE

Turn internal search into a useful user journey

A query produces several close results. Reading should help to distinguish the need definition folder, detailed method and implementation tool.

Updated on 2026-10-21.

Priority checks

Formulate a specific need and then try neighboring terms. Read the descriptions and select the type of resource according to the searched step: understand, run or control.

Interpretation pitfalls

The first result is not always the best document to the context. An absence can come from the vocabulary used rather than a lack of content.

Working record to retain

A short route connects a need definition page, a guide and a checklist. Maintaining unresolved questions helps to rebuild research.

PRACTICAL CASE / WORKED EXAMPLE

A natural requirement does not match the exact title

The following case illustrates an approach to defining the need. Situations are pedagogical: they serve to examine the choices and conditions of success, without describing a fulfilled mission or announcing a guaranteed result.

Example context

A reader is looking for how to check a number, while the resources use the word indicator. The results must allow to continue despite a different formulation of the title.

Suggested approach

Try the neighboring terms and read the descriptions. Differentiate methods of calculation, comparison and verification of sources. Choose the resource that corresponds to the actually sought-by-step.

Conclusion and next step

Research becomes a path of solution. The questions still open serve to clarify the next query instead of multiplying the words without clear intention.

Questions for deeper practice

How do you improve a search without losing the initial need?

Keep the starting question and then specify the object, operation and resource type. Useful results give a complementary vocabulary, but their title should not automatically replace the reader's target.

DETAILED WORKSHOP / APPLICATION

Refine a query for the task to carry out

01 / Prepare the necessary information
Describe the initial question and the desired result. Identify the object, operation and type of resource that could help: file, method or tool.
02 / Carry out the approach
Try a formulation and read the descriptions. Release the useful terms and test the variants without giving up the intention. Compare the resources found according to their contribution to the route.
03 / Examine an alternative situation
If the results are close but too general, specify the operation or scope. A well-classed page is not necessarily the one that meets the searched step.
04 / Decide on the next step
Research is useful when it leads to a resource whose response can be identified. Open questions are used to prepare for the next consultation.
05 / Hand over the verification records
Keep a short track with request, resource and supplement. The reader can restart his work without repaired the tests that have led to useful content.

ANNOTATED WORKING DOCUMENT / REVIEW GRID

A track record from a request

The note retains question, tried formulations, useful results and next resource. It distinguishes the exploration vocabulary from the initial goal of the reader.

On a small screen, scroll the grid horizontally to read all three columns.

Example situations to assess
Observation	Supported interpretation	Next step
A resource responds to the desired operation.	The result can serve as a useful step in the course.	Keep the passage and choose the necessary supplement.
The results remain general despite the good topic.	The request must specify action, object or scope.	Try an appropriate formulation without losing the initial question.
The first result has the word but not the answer.	The presence of the term does not prove its relevance.	Read the descriptions and compare the contribution of resources.

Reviewing the working document

The final verification verifies that each step reduces an open question. A link list is not yet a useful path if the reader cannot explain what each page brings.

REPORTING / EXAMPLE WORDING

Presentation of results: Turn internal search into a useful user journey

Point to clarify

A search result must be judged according to its contribution to the searched operation.

Before handing over

Check that the track keeps the initial question despite the vocabulary variants.

Example of a qualified conclusion

The resource selected meets the described stage of the need. The questions still open guidelines the next consultation and remain distinct from the answer found.