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# Solid
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### Identity
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@ -8,6 +9,14 @@ The rights on a Pod are attached to WebIDs. WebIDs may refer to a person, a fami
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### Networking/Message passing
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[Linked Data Notifications](https://www.w3.org/TR/ldn/)
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Solid allows inboxes for any resource, ie actors or articles
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Example: [annotations related to a particular article](https://linkedresearch.org/annotation/csarven.ca/%23i/87bc9a28-9f94-4b1b-a4b9-503899795f6e)
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Currently smart clients retrieve messages with pull/get, rather than server push.
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### Data Storage/Message Persistance
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Pod is a data storage space. All a user's data is stored here. Applications read and write data into the Pod depending on the authorisations granted by the user or users associated to that Pod. A person may have multiple pods, for example for work and for home. Data may be replicated across pods.
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### Moderation/Reputation
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access control is currently thru ACLs, can plug in different methods; could possibly be swapped out if desired
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an agent with a webid can have control or other levels of access to a resource
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### Social/Discovery
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WebID allows user addressing across all Solid-conforming apps
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Resources (including WebID's -they have uris eg. https://csarven.ca/#i ) are self-describing. They are hosted on pods and have HTTP endpoints. With permissions, normal spidering is possible (from article, you will find author, etc)
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There does not seem to be a Solid-based social network as of this writing, some discussion about creating one. Instead, Solid aims to create tools that enable building of decentralized social applications.
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Any app that can parse the format can read the inbox, and could send responses.
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### Privacy and Access Control
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The owner of the pod controls access to who is authorized to read or write data. However if the user revokes access of an app to their data, the app can't further read or update the user's data, but they would still have the data that the user sent out prior to the revocation.
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@ -37,29 +54,76 @@ Example apps:
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[dokieli](https://dokie.li/) for publishing articles/posts
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[exhaustive list of apps built on Solid](https://solidproject.org/use-solid/apps)
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### Interop with other systems
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Solid doesn't have its own sense of messages per se, but a Solid pod could be used for example in the implementation of an ActivityPub server.
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The minimum requirement to be 'doing Solid' appears to be the use of JSON-LD (linked data) - discussion of [a subset of JSON-LD](https://stephank.nl/p/2018-10-20-a-proposal-for-standardising-a-subset-of-json-ld.html)
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For example, dokieli (a solid app) is able to send notifications to ActivityPub
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Some work on ActivityPub that is
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[discussion of links between ActivityPub and Solid](https://socialhub.activitypub.rocks/t/which-links-between-activitypub-and-solid-project/529/8)
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[discussion of links between ActivityPub and Solid](https://socialhub.activitypub.rocks/t/which-links-between-activitypub-and-solid-project/529/8) - there is work to close the gap between the specs.
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Compatible with existing web; WebAccessControl/ACLs etc are described in RDF
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Some efforts are being made to make WebIDs compatible with DIDs
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[Linked Data Notifications](https://www.w3.org/TR/ldn/)
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Web Access Control
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### Scalability
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Published paper [Solid: A Platform for Decentralized Social
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Applications Based on Linked Data](https://pdfs.semanticscholar.org/5ac9/3548fd0628f7ff8ff65b5878d04c79c513c4.pdf) indicated sub-linear scaling with number of users/pods.
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### Metrics
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### In the wild
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[Solid Apps](https://solidproject.org/use-solid/apps)
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### Compare/contrast
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Generally:
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ActivityPub - smart server
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Solid - smart client
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### Links
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[A Demonstration of the Solid Platform for Social Web
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Applications](http://crosscloud.org/2016/www-mansour-pdf.pdf)
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* [Solid specification development](https://github.com/solid/specification)
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* [Solid Ecosystem Editors Draft] https://solid.github.io/specification/)
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* [Solid Chat] https://gitter.im/solid/specification)
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* [Solid Community Group Meetings](https://www.w3.org/community/solid/wiki/Meetings)
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[Solid: A Platform for Decentralized Social
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Applications Based on Linked Data](https://pdfs.semanticscholar.org/5ac9/3548fd0628f7ff8ff65b5878d04c79c513c4.pdf)
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[LDN Test Reports and Summary](https://linkedresearch.org/ldn/tests/summary)
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(contributions also from Rahul Kothari)
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[Linked Research on the Decentralised Web](https://csarven.ca/linked-research-decentralised-web#decentralised-linked-research-application)
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[A Demonstration of the Solid Platform for Social Web Applications](http://crosscloud.org/2016/www-mansour-pdf.pdf)
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(contributions also from Rahul Kothari and Sarven Capadisli)
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### Payload example
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```
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{
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"@context": {
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"@language": "en",
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"sioc": "http://rdfs.org/sioc/ns#",
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"foaf": "http://xmlns.com/foaf/0.1/"
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},
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"@id": "",
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"@type": "sioc:Comment",
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"sioc:reply_of": { "@id": "http://example.org/article" },
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"sioc:created_at": {
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"@type": "http://www.w3.org/2001/XMLSchema#dateTime",
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"@value": "2015-12-23T16:44:21Z"
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},
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"sioc:content": "This is a great article!",
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"sioc:has_creator": {
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"@id": "http://example.org/profile",
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"@type": "sioc:UserAccount",
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"sioc:account_of": { "@id": "http://example.org/profile#alice" },
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"sioc:avatar": { "@id": "http://example.org/profile/avatar.png" },
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"foaf:name": "Alice"
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}
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}
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```
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