https://www.epo.org/en/service-support/faq/searching-patents/open-patent-services/general-information/where-can-i-find
Where can I find technical documentation for OPS?
You can find a technical description, schemas and further supporting documentation on our website.
To use OPS, you need to be familiar with web services in general. We also strongly recommend that you study Open Patent Services v.2 - Web Service Definition and Description - so that you fully understand the background and environment of the system.
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