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But you will often need to find Capabilities that supports the integrity of the content.",{"_31":1287,"_33":1288},[],{"_35":36,"_37":1289,"_39":1231,"_41":1290,"_43":1291,"_45":1292,"_47":48},"kMuifL6j",{},[],"There are many important mechanisms for data validation: format compliance, signature validation, and capability checking.",{"_35":79,"_37":1294,"_39":1231,"_41":1295,"_43":1296,"_45":1297,"_47":48},"RC1TWg2j",{"_155":174},[],"Validating the Data",[453,456],"/protocol","2025-07-10T15:47:11.799Z",{"_220":1175},{},{"_467":1162,"_470":1173},{"_37":1150,"_480":453,"_457":1305,"_451":-5,"_482":-5,"_483":-5,"_484":-5,"_485":-5},[477],1781370452038,[821,1150,-5,24],"[\"ENTITY\",\"hm://z6MkfzKMhF9k1oPaQsShWAg8xJzbWf5kaZgn1MkeZvhcAsmB/protocol\",null,false]",{"_495":1310,"_819":1443,"_822":1444},{"_497":1311,"_804":805,"_806":965,"_808":-5,"_809":216,"_810":216,"_811":216,"_812":-5,"_813":-5,"_814":24,"_815":816,"_817":818},{"_35":26,"_26":1312,"_37":1440},{"_28":1313,"_451":1379,"_452":453,"_454":1431,"_457":1432,"_459":1433,"_461":1434,"_462":1435,"_465":1437,"_467":1318,"_468":1438,"_472":473},[1314,1322,1371],{"_31":1315,"_33":1316},[],{"_35":36,"_37":1317,"_39":1318,"_41":1319,"_43":1320,"_45":1321,"_47":48},"S2nKG5GQ","bafy2bzaceb4zb7lfi7vif3lklnwt54hlspqcbbg7xs7dwtugwieiqllgkh4jg",{},[],"The Hypermedia data model can be described in two shapes. The format of the signed data events that are permanently saved for validation, and the state snapshot, which represents the current state of the content.",{"_31":1323,"_33":1366},[1324,1331],{"_31":1325,"_33":1326},[],{"_35":36,"_37":1327,"_39":1318,"_41":1328,"_43":1329,"_45":1330,"_47":48},"C2KvRZbj",{},[],"With the exception of attachments, all data is encoded as IPLD-CBOR blobs (an alternative to JSON), and is saved into IPFS for permanent archival across the network.",{"_31":1332,"_33":1361},[1333,1340,1347,1354],{"_31":1334,"_33":1335},[],{"_35":36,"_37":1336,"_39":1318,"_41":1337,"_43":1338,"_45":1339,"_47":48},"SIw77yU1",{},[],"Change: Describes the creation or evolution of a Document",{"_31":1341,"_33":1342},[],{"_35":36,"_37":1343,"_39":1318,"_41":1344,"_43":1345,"_45":1346,"_47":48},"dC34AuQI",{},[],"Ref: A blob which points to the current set of Changes, to signal the latest version of a Document.",{"_31":1348,"_33":1349},[],{"_35":36,"_37":1350,"_39":1318,"_41":1351,"_43":1352,"_45":1353,"_47":48},"FVB8vSer",{},[],"Capability: Describes the granted permissions that other keys have to interact with a document or set of documents",{"_31":1355,"_33":1356},[],{"_35":36,"_37":1357,"_39":1318,"_41":1358,"_43":1359,"_45":1360,"_47":48},"2iYmaWna",{},[],"Comment: Lightweight content from a single author",{"_35":36,"_37":1362,"_39":1318,"_41":1363,"_43":1364,"_45":1365,"_47":48},"GyxAWGyW",{"_155":156},[],"These blobs are always signed by a private key, and must be one of the following types:",{"_35":79,"_37":1367,"_39":1318,"_41":1368,"_43":1369,"_45":1370,"_47":48},"ZsFAfDjv",{"_155":174},[],"Immutable Signed Data",{"_31":1372,"_33":1426},[1373],{"_31":1374,"_33":1421},[1375,1388,1400,1407],{"_31":1376,"_33":1377},[],{"_35":36,"_37":1378,"_39":1379,"_41":1380,"_43":1381,"_45":1387,"_47":48},"XWWgqOII","bafy2bzacebiqt5mbkhoow3ep6wmlhz5i2q4q2oe5zvjojqxbgzjswcvihaasi",{},[1382],{"_35":939,"_187":1383,"_190":1384,"_41":1385,"_47":1386},[216],[218],{},"hm://z6MkfzKMhF9k1oPaQsShWAg8xJzbWf5kaZgn1MkeZvhcAsmB/protocol/data-model/site","Site: Represents the content for a given key",{"_31":1389,"_33":1390},[],{"_35":36,"_37":1391,"_39":1379,"_41":1392,"_43":1393,"_45":1399,"_47":48},"PBUZi-8J",{},[1394],{"_35":939,"_187":1395,"_190":1396,"_41":1398,"_47":481},[216],[1397],8,{},"Document: A page of content inside a Site, the main container for information in the network",{"_31":1401,"_33":1402},[],{"_35":36,"_37":1403,"_39":1318,"_41":1404,"_43":1405,"_45":1406,"_47":48},"caGJcouw",{},[],"Comment: A message attached to a Document, from a single author",{"_31":1408,"_33":1409},[],{"_35":36,"_37":1410,"_39":1318,"_41":1411,"_43":1412,"_45":1420,"_47":48},"tw9JBk0B",{},[1413],{"_35":1414,"_187":1415,"_190":1417,"_41":1419,"_47":48},"Italic",[1416],16,[1418],23,{},"Capability: The current set of valid permissions on a given document",{"_35":36,"_37":1422,"_39":1318,"_41":1423,"_43":1424,"_45":1425,"_47":48},"-0PUzE61",{"_155":156},[],"These are the mutable values in the Hypermedia network. They can change over time as a result of interpreting the latest Immutable Signed Data.",{"_35":79,"_37":1427,"_39":1318,"_41":1428,"_43":1429,"_45":1430,"_47":48},"-tbBW1G7",{"_155":174},[],"Snapshot Data",[456],"/protocol/data-model","2025-03-14T16:50:50.496Z","2025-03-14T17:51:13.274Z",{"_220":1436},"Data Model",{},{"_467":1318,"_470":1439},"1741971050496",{"_37":1441,"_480":453,"_457":1442,"_451":-5,"_482":-5,"_483":-5,"_484":-5,"_485":-5},"hm://z6MkfzKMhF9k1oPaQsShWAg8xJzbWf5kaZgn1MkeZvhcAsmB/protocol/data-model",[477,478],[821,1441,-5,24],"[\"ENTITY\",\"hm://z6MkfzKMhF9k1oPaQsShWAg8xJzbWf5kaZgn1MkeZvhcAsmB/protocol/data-model\",null,false]",{"_495":1446,"_819":1461,"_822":1463},{"_497":1447,"_804":805,"_806":1460,"_808":-5,"_809":216,"_810":216,"_811":216,"_812":-5,"_813":-5,"_814":24,"_815":816,"_817":818},{"_35":452,"_37":1448,"_462":1452},{"_451":1449,"_480":456,"_37":1450,"_457":1451,"_482":-5,"_483":-5,"_484":-5,"_485":-5},"bafy2bzacebcdqgkczlb6f6y4pfhegwdd27tomlrxwxmyai6kyr4mk2i5rxbks","hm://z6MkgisVMELvqnsCo3dYmtVpy8PiqPGMVwfAyBWFn84vebq4",[],{"_220":1453,"_238":1454,"_1455":1454,"_257":48,"_282":1456,"_408":48,"_392":48,"_319":24,"_371":1457,"_1459":-5},"Eric Vicenti","ipfs://bafkreid63qduvw3p4bldx4mjxnb6tskhgabvhe4zfsf62hmfrp5xbe6uku","thumbnail","https://eric.vicenti.net",{"_1458":48},"headerLayout","summary",1781370452088,[1462,456],"ACCOUNT","[\"ACCOUNT\",\"z6MkgisVMELvqnsCo3dYmtVpy8PiqPGMVwfAyBWFn84vebq4\"]","ssrContentHTML","

The main building block for knowledge in the Hypermedia network is the Document.

Each Document is identified by the Site Id + Path

Content

The content of the document is a hierarchy of Blocks. Each Block Node contains one block and any number of children blocks.

Block Types

Paragraph
Heading
Code
Math
Image
Video
File
Button
Embed
WebEmbed
Query
Experimental Block Types
- Nostr

Note: Some Block types do not properly support children. TODO: research and explain this better

Metadata

A document has the following metadata fields to describe it. They are all optional but it is recommended to always have a name

`name`

The title of the Document. For Home Documents, this is the title of the Site

`icon`

The IPFS url for the icon associated with this Document. For Home Documents, this is the icon (or favicon) for the Site.

`cover`

The IPFS url for the cover image. When present, displayed full-width at the top of the document.

`siteUrl`

For Home Documents, contains the https URL where the Site is published on the web

`displayPublishTime`

TODO

`showOutline`

TODO

`showActivity`

TODO

`contentWidth`

TODO

`theme`

TODO

Experimental Metadata

`seedExperimentalLogo`

For Home Documents, contains the IPFS url for the logo to be used in the header, instead of the name+logo

Deprecated Metadata

Some fields are no longer in use but they may appear in older Documents. They can be safely ignored.

layout
seedExperimentalHomeOrder

How Documents Change

You can interpret the current state of a Document by looking for the most recent Ref Blob, which will link to a DAG of Change Blobs. When you sort these changes, you can evaluate each operation to reach the current state of the document.

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