FORMATS / IDENTIFIERS / METHODS
Documentary reference library
Find an identifier, unit, HTTP status or data convention, then open the method explaining its use and limits.
193 references · page 9 of 9
| Object to check | Code or notation | Context and use |
|---|---|---|
| ECB: nine historical rates to check a conversion | USD / EUR · GBP / EUR · JPY / EUR | These nine observations cover three selected dates in 2025 and three currencies. Extracted on 22 October 2026, this sample is fixed: it is neither a current quote, an annual average nor every day of 2025. |
From format to fact: three separate checks
Recognise the format
An identifier matching a pattern or checksum can still refer to the wrong entity. A format check catches typing errors; it does not verify the holder.
Find the right object
Open the corresponding register or document. Compare its name, scope, version and period with your question. Retain technical identifiers without translating them.
Qualify the conclusion
Separate what the source declares, what you observed and what remains unestablished. A value without a unit, period or definition cannot support a reliable comparison.
Notation examples explain a rule. They are neither certification nor a live check of your dossier.
Check documentary identifiers