···501};
502```
503504-In TypeScript, we expressed this as a reference to the `Post` type. Since lexicons are JSON files with globally unique names, here's how we'll say this in lexicon:
505506-```js {12}
507-{
508- "lexicon": 1,
509- "id": "com.twitter.like",
510- "defs": {
511- "main": {
512- "type": "record",
513- "key": "tid",
514- "record": {
515- "type": "object",
516- "required": ["subject"],
517- "properties": {
518- "subject": { "type": "ref", "ref": "com.twitter.post" }
519- }
520- }
521- }
522- }
523-}
524-```
525526-We're saying: a Like is an object with a `subject` field that refers to some Post.
527-528-However, "refers" is doing a lot of work here. What does a Like record actually look like? How do you *actually* refer from inside of one JSON file to another JSON file?
529530```js
531{
532 subject: "???"
533}
534```
00535536We could try to refer to the Post record by its path in our "everything folder":
537···789 // ...
790 "text": { "type": "string", "maxGraphemes": 300 },
791 "createdAt": { "type": "string", "format": "datetime" },
792- "parent": { "type": "ref", "ref": "com.twitter.post" }
793 // ...
794```
795796-This says: the `parent` field is a reference to another `com.twitter.post` record.
797798Every reply to dril's post will have dril's post as their `parent`:
799
···501};
502```
503504+So, a Like is a record that refers to its Post.
505506+But how do we express this in JSON?
000000000000000000507000508509```js
510{
511 subject: "???"
512}
513```
514+515+How do we refer from one JSON file to another JSON file?
516517We could try to refer to the Post record by its path in our "everything folder":
518···770 // ...
771 "text": { "type": "string", "maxGraphemes": 300 },
772 "createdAt": { "type": "string", "format": "datetime" },
773+ "parent": { "type": "string", "format": "at-uri" }
774 // ...
775```
776777+This says: the `parent` field is an `at://` link to another record.
778779Every reply to dril's post will have dril's post as their `parent`:
780
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