{"result":{"depiction_url":null,"edges":{"refers":{"objects":[{"created":"2026-10-07T11:13:07Z","object_id":{"id":2926,"is_a":["text","documentation","developerguide"],"name":"developer_startup_activation","title":{"_type":"trans","tr":{"en":"Application startup and per-site module activation"}},"uri":"https:\/\/zotonic.com\/id\/2926"},"seq":1000000}],"predicate":{"id":2409,"is_a":["meta","predicate"],"name":"refers","title":{"_type":"trans","tr":{"en":"Refers"}},"uri":"https:\/\/zotonic.com\/id\/refers"}},"subject":{"objects":[{"created":"2026-10-07T11:13:17Z","object_id":{"id":2556,"is_a":["categorization","keyword","keyword_information_type"],"name":"zotonic_topic_explanation","title":"Explanation","uri":"https:\/\/zotonic.com\/id\/2556"},"seq":1},{"created":"2026-10-07T11:13:17Z","object_id":{"id":2564,"is_a":["categorization","keyword","keyword_audience"],"name":"zotonic_topic_backend_developer","title":"Backend developer","uri":"https:\/\/zotonic.com\/id\/2564"},"seq":2},{"created":"2026-10-07T11:13:17Z","object_id":{"id":2613,"is_a":["categorization","keyword","keyword_domain"],"name":"zotonic_topic_development_and_debugging","title":"Development and debugging","uri":"https:\/\/zotonic.com\/id\/2613"},"seq":3},{"created":"2026-10-07T11:13:17Z","object_id":{"id":2635,"is_a":["categorization","keyword","keyword_architecture"],"name":"zotonic_topic_module","title":"Module","uri":"https:\/\/zotonic.com\/id\/2635"},"seq":4},{"created":"2026-10-07T11:13:17Z","object_id":{"id":2634,"is_a":["categorization","keyword","keyword_architecture"],"name":"zotonic_topic_site","title":"Site","uri":"https:\/\/zotonic.com\/id\/2634"},"seq":5}],"predicate":{"id":308,"is_a":["meta","predicate"],"name":"subject","title":{"_type":"trans","tr":{"en":"Keyword"}},"uri":"http:\/\/purl.org\/dc\/elements\/1.1\/subject"}}},"id":2919,"is_a":["text","documentation","developerguide"],"links":[{"rel":"self","target":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/2919"},{"rel":"hub","target":"https:\/\/zotonic.com\/.zotonic\/websub"}],"medium":null,"medium_url":null,"name":"developer_application_identities","page_url":{"en":"https:\/\/zotonic.com\/docs\/2919\/erlang-applications-zotonic-modules-and-sites","x-default":"https:\/\/zotonic.com\/docs\/2919\/erlang-applications-zotonic-modules-and-sites"},"preview_url":null,"resource":{"body":{"_type":"trans","tr":{"en":"<aside><p>Putting a package on the code path is different from activating its Zotonic module for a particular site. Use <a href=\"\/id\/2926\">Application startup and per-site module activation<\/a> to understand this distinction when a compiled feature is missing.<\/p><\/aside>\n<p>An <strong>Erlang application<\/strong> is a package described by a <code>.app<\/code> file, normally generated from <code>src\/&lt;name&gt;.app.src<\/code>. It can provide modules and an OTP application callback.<\/p>\n<p>A <strong>Zotonic module<\/strong> is functionality that can be activated for a site. Its main Erlang module declares attributes such as <code>-mod_title<\/code> and <code>-mod_depends<\/code>.<\/p>\n<p>A <strong>site<\/strong> is a named website with its own configuration and runtime context. Several sites share the same Erlang VM and loaded code, while module activation and site data are site-specific.<\/p>"}},"category_id":{"id":317,"is_a":["meta","category"],"name":"developerguide","title":"Developer guide","uri":"https:\/\/zotonic.com\/id\/developerguide"},"content_group_id":{"id":339,"is_a":["meta","content_group"],"name":"default_content_group","title":{"_type":"trans","tr":{"en":"Default Content Group"}},"uri":"https:\/\/zotonic.com\/id\/default_content_group"},"created":"2026-10-07T11:12:55Z","creator_id":{"id":1,"is_a":["person"],"name":"administrator","title":"Site Administrator","uri":"https:\/\/zotonic.com\/id\/1"},"doc_editorial_bundle":true,"doc_editorial_edges":{"subject":[2556,2564,2613,2634,2635]},"is_authoritative":true,"is_dependent":false,"is_featured":false,"is_protected":false,"is_published":true,"is_unfindable":false,"language":["en"],"modified":"2026-10-07T20:45:39Z","modifier_id":{"id":1,"is_a":["person"],"name":"administrator","title":"Site Administrator","uri":"https:\/\/zotonic.com\/id\/1"},"name":"developer_application_identities","pivot_geocode":null,"pivot_location_lat":null,"pivot_location_lng":null,"privacy":0,"publication_end":"9999-06-01T00:00:00Z","publication_start":"2026-10-07T11:12:55Z","slug":"erlang-applications-zotonic-modules-and-sites","summary":{"_type":"trans","tr":{"en":"These terms describe different parts of the system."}},"title":{"_type":"trans","tr":{"en":"Erlang applications, Zotonic modules, and sites"}},"title_slug":{"_type":"trans","tr":{"en":"erlang-applications-zotonic-modules-and-sites"}},"tz":"UTC","uri":null,"version":15,"visible_for":0},"uri":"https:\/\/zotonic.com\/id\/2919","uri_template":"https:\/\/zotonic.com\/id\/:id","websub":{"hub":"https:\/\/zotonic.com\/.zotonic\/websub","topic":"https:\/\/zotonic.com\/.zotonic\/websub\/topic\/2919"}},"status":"ok"}