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Vapour, a Linked Data validator

Vapour is a validation service to check whether semantic web data is correctly published according to the current best practices, as defined by the Linked Data principles, the Best Practice Recipes and the Cool URIs.

Although the main way to use Vapour is through the public web service, the source code is available as open source software under the terms of the W3C License, so you can set up your own service or modify the source code in Python, if needed. Some more details are available at ohloh.

Public web service

try our public service at

Sample reports







Vapour exposes exactly the same information used for generating the report as RDF. Please check further details about how use this API.

Become involved

All the development material of the project (code, documentation, etc.) is stored in the mercurial repository at Bitbucket:

hg clone

Don't hesitate to post comments or to report bugs using the project's bug tracker.

High-level architecture

Vapour has the following high level architecture:

Vapour's architecture

Vapour contains three modules:

  • cup provides the web interface of the application
  • teapot is the core of the application that launches HTTP dialogs, evaluates the responses and stores the results into the (in-memory) RDF store
  • strainer generates the reports, both in XHTML and RDF/XML


Vapour was originally created to check the compliance of a web site against the recipes described in the Best Practices Recipes for Publishing RDF Vocabularies (W3C Working Draft), but later it was extended to be more generic to any kind of resources. This work is not endorsed by W3C.



ADAPTA INNPACTO INNPACTO 2011 Spanish Ministry of Science and Innovation European Regional Development Fund (FEDER)

This project have been developed by CTIC partially supported by the ADAPTA research project, which is partially funded by the INNPACTO 2011 programme (IPT-2011-0949-430000) of the Spanish Ministry of Science and Innovation and the European Regional Development Fund (FEDER).


Fundación CTIC