Science and measurement
NOAA tide observations
The latest water level from a single tide station, in about two hundred bytes — the smallest useful XML document in this directory.
Everything about this endpoint is a parameter: the station, the product, the units, the datum, and the output format. The XML form is one query-string value away from JSON or CSV.
At this size it is the ideal document for demonstrating a tool, because the whole thing fits in a code block.
- Publisher
- US National Oceanic and Atmospheric Administration
- Host
tidesandcurrents.noaa.gov- Format
- Not one of the formats we document
- Root when listed
- data (2026-08-18)
- Size when listed
- 237 B
Where it reaches
- ToolsXML validatorSmall enough to paste whole.
- Datatypesxs:decimalThe type a measurement like this should be, and the traps in it.
Also in this category
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- NCBI E-utilities database listThe index of every database E-utilities can query — the first call anybody makes against PubMed's API, and it answers in XML.
- arXiv computer scienceNew computer science preprints, as an RSS feed large enough to be a real test — several megabytes of abstracts.
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