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gall-guide: apply various suggestions from poprox code review

c7f7e3atinnus-napbus5 years ago

content/docs/userspace/gall-guide/1-arvo.md+12−12

compare with master

unifiedsplit

@@ -66,7 +66,7 @@ Here's a brief summary of each of the vanes:

67- **Iris**: Web client vane. If you want your agent to query external web APIs and

68 the like, it's done via Iris. Oftentimes web API interactions are

69− spun out into [Threads](/docs/userspace/threads/overview) to avoid

69+ spun out into [threads](/docs/userspace/threads/overview) to avoid

70 complicating the Gall agent itself, so a Gall agent would not necessary deal

71 with Iris directly, even if it made use of external APIs.

72- **Jael**: Key infrastructure vane. Jael keeps track of PKI data for your ship and

@@ -183,7 +183,7 @@ desk

183

184- `app`: Gall agents.

185- `gen`: Generators.

186−- `lib`: Libraries - these would typically be imported with the `/+` Ford rune.

186+- `lib`: Libraries - these are imported with the `/+` Ford rune.

187- `mar`: `mark` files, which are filetype definitions.

188- `sur`: Structures - these typically contain type definitions and structures,

189 and would be imported with the `/-` Ford rune.

@@ -217,7 +217,7 @@ sys

217```

218

219- `arvo.hoon`: Source code for Arvo itself.

220−- `hoon.hoon`: Hoon standard library.

220+- `hoon.hoon`: Hoon standard library and compiler.

221- `lull.hoon`: Mostly structures and type definitions for interacting with

222 vanes.

223- `vane`: This directory contains the source code for each of the vanes.

@@ -246,18 +246,18 @@ all have these libraries available to them in their subject.

246You should now have a general idea of the different parts of Arvo, but how does

247a Gall agent interact with these things?

248

249−There are two basic ways of interacting with other parts of the system: By

249+There are two basic ways of interacting with other parts of the system: by

250scrying them, and by passing them messages and receiving messages in response.

251−There are also two basic things to interact with: Vanes, and other agents.

251+There are also two basic things to interact with: vanes, and other agents.

252

253- Scries: The scry system allows you to access the state of other agents and

254 vanes in a read-only fashion. Scries can be performed from any context with

255 the dotket (`.^`) rune. Each vane has "scry endpoints" which define what you

256 can read, and these are comprehensively documented in the Scry Reference of

257 each vane's section of the [Arvo documentation](/docs/arvo/overview). Agents

258− can also define scry endpoints in the `+on-peek` arm of their agent core.

258+ define scry endpoints in the `+on-peek` arm of their agent core.

259− Scries can only be done on the local ship, it is not yet possible to perform

259+ Scries can only be done on the local ship; it is not yet possible to perform

260− scries over the network. There is a separate [guide to

260+ scries over the network (but this functionality is planned for the future). There is a separate [guide to

261 scries](/docs/arvo/concepts/scry) which you might like to read through for

262 more details.

263- Messages:

@@ -265,10 +265,10 @@ There are also two basic things to interact with: Vanes, and other agents.

265 respond with in its respective section of `lull.hoon`. These might do all

266 manner of things, depending on the vane. For example, Iris might fetch an

267 external HTTP resource for you, Clay might read or build a specified file,

268− etc. The tasks and gifts of each vane are comprehensively documented in the

268+ etc. The `task`s and `gift`s of each vane are comprehensively documented in the

269 API Reference of each vane's section of the [Arvo

270 documentation](/docs/arvo/overview).

271− - Agents: These can be `%poke`d with some data, and can also be `%watch`ed,

271+ - Agents: These can be `%poke`d with some data, which is a request to perform a single action. They can also be `%watch`ed,

272 which means to subscribe for updates. We'll discuss these in detail later in

273 the guide.

274

@@ -283,8 +283,8 @@ meaning for now, we'll discuss them in detail later in the guide.

283Inter-agent messaging can occur over the network, so you can interact with

284agents on other ships as well as local ones. You can only talk to local vanes,

285but some vanes like Clay are able to make requests to other ships on your

286−behalf. Note this summary is simplified - vanes don't just talk in tasks and

286+behalf. Note this summary is simplified - vanes don't just talk in `task`s and

287−gifts in all cases. For example, requests from HTTP clients through Eyre (the

287+`gift`s in all cases. For example, requests from HTTP clients through Eyre (the

288webserver vane) behave more like those from agents than vanes, and a couple of

289other vanes also have some different behaviours. Agent interactions are also a

290little more complicated, and we'll discuss that later, but the basic patterns

content/docs/userspace/gall-guide/10-scry.md+6−6

@@ -79,7 +79,7 @@ specified agent is installed and running:

79A scry to Gall with a `%x` `care` will be passed to the agent for handling. Gall

80handles `%x` specially, and expects an extra field at the end of the `path` that

81specifies the `mark` to return. Gall will take the data produced by the

82−specified endpoint and try convert it to the given mark, crashing if the mark

82+specified endpoint and try to convert it to the given mark, crashing if the mark

83conversion fails. The extra field specifying the mark is not passed through to

84the agent itself. Here's a couple of examples:

@@ -112,7 +112,7 @@ all, and interprets `[~ ~]` to mean the endpoint exists but the requested data

112does not. In either case the dotket expression which initiated the scry will

113crash. The `cage` will contain the actual data to return.

114

115−The `on-peek` arm, therefore, begins like so:

115+An ordinary `on-peek` arm, therefore, begins like so:

116

117```hoon

118++ on-peek

@@ -123,7 +123,7 @@ The `on-peek` arm, therefore, begins like so:

123

124Typically, you'd handle the `path` similarly to `on-watch`, as we discussed in

125the lesson on subscriptions. You'd use something like a wutlus expression to

126−test the type of the `path`, defining your scry endpoints like so:

126+test the value of the `path`, defining your scry endpoints like so:

127

128```hoon

129?+ path (on-peek:def path)

@@ -334,10 +334,10 @@ crash!

334- Scries can only be performed on the local ship, not on remote ships.

335- Gall scries with an agent name in the `desk` field will be passed to that

336 agent's `on-peek` arm for handling.

337−- Gall scries with a `%x` `care` take a `mark` at the end of the scry path,

337+- Gall scries with a `%x` `care` take a `mark` at the end of the scry `path`,

338− telling gall to convert the data returned by the scry endpoint to the mark

338+ telling Gall to convert the data returned by the scry endpoint to the mark

339 specified.

340−- The `on-peek` arm takes a `path` with the `care` in the head and the path part

340+- The `on-peek` arm takes a `path` with the `care` in the head and the `path` part

341 of the scry in the tail, like `/x/some/path`.

342- The `on-peek` arm produces a `(unit (unit cage))`. The outer `unit` is null if

343 the scry endpoint does not exist, and the inner `unit` is null if the data

content/docs/userspace/gall-guide/11-fail.md+9−7

@@ -49,12 +49,12 @@ include a message of "subscribe wire not unique", as well as the agent name, the

49`wire`, the target ship and the target agent.

51How you might handle these cases (if you wanted to manually handle them) depends

52−on the logic of your particular agent.

52+on the purpose of your particular agent.

54## Helper core

56Back in the lesson on lustar virtual arms, we briefly mentioned a common pattern

57−is to define an alias of `hc` for a "helper core" like:

57+is to define a deferred expression for a helper core named `hc` like:

59```hoon

60+* this .

@@ -62,6 +62,8 @@ is to define an alias of `hc` for a "helper core" like:

62 hc ~(. +> bowl)

63```

65+The name `do` is also used frequently besides `hc`.

66+

65A helper core is a separate core composed into the subject of the agent core,

67A helper core is a separate core composed into the subject of the agent core,

66containing useful functions for use by the agent arms. Such a helper core would

68containing useful functions for use by the agent arms. Such a helper core would

67typically contain functions that would only ever be used internally by the

69typically contain functions that would only ever be used internally by the

@@ -90,14 +92,14 @@ rune directly above the agent core like:

90=<

92=<

91|_ =bowl:gall

93|_ =bowl:gall

92+* this .

94+* this .

93− def ~(. (default-agent this %|) bowl)

95+ def ~(. (default-agent this %.n) bowl)

94 hc ~(. +> bowl)

96 hc ~(. +> bowl)

95++ on-init

97++ on-init

96.....

98.....

97```

99```

100

99We can then add the helper core below the agent core. The helper core is most

101We can then add the helper core below the agent core. The helper core is most

100−typically a `door` like the agent core, also with the `bowl` as its sample. This

102+typically a door like the agent core, also with the `bowl` as its sample. This

101is just so any functions you define in it have ready access to the `bowl`. It

103is just so any functions you define in it have ready access to the `bowl`. It

102would look like:

104would look like:

103

105

@@ -109,7 +111,7 @@ would look like:

109--

111--

110```

112```

111

113

112−Back in the lustar virtual arm of the agent core, we give it an alias of `hc`

114+Back in the lustar virtual arm of the agent core, we give it a deferred expression name of `hc`

113and call it like so:

115and call it like so:

114

116

115```hoon

117```hoon

@@ -134,6 +136,6 @@ like `(some-function:hc ....)`.

134 of the agent core.

136 of the agent core.

135- Helper cores are typically placed below the agent core, and composed with a

137- Helper cores are typically placed below the agent core, and composed with a

136 tisgal (`=<`) rune.

138 tisgal (`=<`) rune.

137−- The helper core is typically a `door` with the `bowl` as a sample.

139+- The helper core is typically a door with the `bowl` as a sample.

138−- The helper core is typically given an alias of `hc` in the lustar virtual arm

140+- The helper core is typically given a name of `hc` or `do` in the lustar virtual arm

139 of the agent core.

141 of the agent core.

content/docs/userspace/gall-guide/2-agent.md+9−9

@@ -6,9 +6,9 @@ template = "doc.html"

7In this lesson we'll look at the basic type and structure of a Gall agent.

9−A Gall agent is a `door` with exactly ten arms. Each arm is responsible for

9+A Gall agent is a [door](/docs/glossary/door) with exactly ten [arms](/docs/glossary/arm). Each arm is responsible for

10−handling certain kinds of events that Gall feeds in to the agent. A `door` is

10+handling certain kinds of events that Gall feeds in to the agent. A door is

11−just a `core` with a sample - it's made with the

11+just a [core](/docs/glossary/core) with a sample - it's made with the

12[barcab](/docs/hoon/reference/rune/bar#_-barcab) rune (`|_`) instead of the

13usual [barcen](/docs/hoon/reference/rune/bar#-barcen) rune (`|%`).

@@ -58,7 +58,7 @@ These two arms handle responses to requests our agent previously initiated.

59## Bowl

61−The sample of the `door` is a `bowl:gall`. Every time an event triggers the

61+The sample of a Gall agent door is always a `bowl:gall`. Every time an event triggers the

62agent, Gall populates the bowl with things like the current date-time, entropy,

63subscription information, which ship the request came from, etc, so that all the

64arms of the agent have access to that data. For the exact structure and contents

@@ -69,9 +69,9 @@ documentation](/docs/arvo/gall/data-types#bowl).

70If you've worked through [Hoon School](/docs/hoon/hoon-school/intro), you may

71recall that a core is a cell of `[battery payload]`. The battery is the core

72−itself compiled to nock, and the payload is the subject which it operates on.

72+itself compiled to Nock, and the payload is the subject which it operates on.

74−For an agent, the payload will at least contain the bowl, the usual standard

74+For an agent, the payload will at least contain the bowl, the usual Hoon and `zuse` standard

75library functions, and the **state** of the agent. For example, if your agent

76were for an address book app, it might keep a `map` of ships to address book

77entries. It might add entries, delete entries, and modify entries. This address

@@ -135,7 +135,7 @@ This is just a dummy agent that does absolutely nothing - it has no state and

135rejects all messages by crashing. We'll get to what each of the arms do later.

136For now, we'll just consider a few particular points.

137

138−Firstly, note its structure - it's a `door` (created with `|_`) with a sample of

138+Firstly, note its structure - it's a door (created with `|_`) with a sample of

139`bowl:gall` and the ten arms described earlier.

140

141Secondly, you'll notice some of the arms return:

@@ -195,7 +195,7 @@ Now, let's have a look:

195The dojo pretty-prints cores with a format of `number-of-arms.hash`. You can see

196the head of `skeleton` is `10.fxw` - that's the battery of the core, our 10-arm

197agent. If we try printing the head of `skeleton` we'll see it's a whole lot of

198−compiled `nock`:

198+compiled Nock:

199

200```

201> -.skeleton

@@ -279,7 +279,7 @@ If we again examine our agent core's payload by looking at the tail of

279

280## Summary

281

282−- A Gall agent is a `door` with ten arms and a sample of `bowl:gall`.

282+- A Gall agent is a door with exactly ten specific arms and a sample of `bowl:gall`.

283- Each of the ten arms handle different kinds of events - Gall calls the

284 appropriate arm for the kind event it receives.

285- The ten arms fit roughly into five categories:

content/docs/userspace/gall-guide/3-imports-and-aliases.md+22−22

@@ -40,11 +40,11 @@ imported at the beginning of an agent with the

40[faslus](/docs/arvo/ford/ford#ford-runes) (`/+`) rune.

42The library is a wet gate which takes two arguments: `agent` and `help`. The

43−first is your agent core itself, and the second is a `?`. If `help` is `%.y`, it

43+first is your agent core itself, and the second is a `?`. If `help` is `%.y` (equivalently, `%&`), it

44−will crash in all cases. If `help` is `%.n`, it will use its defaults. You would

44+will crash in all cases. If `help` is `%.n` (equivalently, `%|`), it will use its defaults. You would

45almost always have `help` as `%.n`.

47−The wet gate returns a `agent:gall` `door` with a sample of `bowl:gall` - a

47+The wet gate returns a `agent:gall` door with a sample of `bowl:gall` - a

48typical agent core. Usually you would define an alias for it in a virtual arm

49([explained below](#virtual-arms)) so it's simple to call.

@@ -52,7 +52,7 @@ typical agent core. Usually you would define an alias for it in a virtual arm

53The `dbug` library lets you inspect the state and `bowl` of your agent from the

54dojo. It includes an `agent:dbug` function which wraps your whole `agent:gall`

55−`door`, adding its extra debugging functionality while transparently passing

55+door, adding its extra debugging functionality while transparently passing

56events to your agent for handling like usual.

58To use it, you just import `dbug` with a

@@ -92,21 +92,21 @@ if you include a scry endpoint with a path of `/x/dbug/state`, it will use that

92instead.

94We haven't yet covered some of the concepts described here, so don't worry if

95−you don't fully understand `%dbug`'s functionality - you can refer back here

95+you don't fully understand `dbug`'s functionality - you can refer back here

96later.

98## Virtual arms

100An agent core must have exactly ten arms. However, there's a special kind of

101"virtual arm" that can be added without actually increasing the core's arm

102−count. A virtual arm is created with the

102+count, since it really just adds code to the other arms in the core. A virtual arm is created with the

103[lustar](/docs/hoon/reference/rune/lus#-lustar) (`+*`) rune, and its purpose is

104−to define _aliases_. It takes a list of pairs of names (aliases) and hoon

104+to define _deferred expressions_. It takes a list of pairs of names and Hoon

105−expressions. When compiled, the aliases defined in the virtual arm are

105+expressions. When compiled, the deferred expressions defined in the virtual arm are

106implicitly inserted at the beginning of every other arm of the core, so they all

107−have access to them.

107+have access to them. Each time a name in a `+*` is called, the associated Hoon is evaluated in its place, similar to lazy evaluation except it is re-evaluated whenever needed. See the [tistar](/docs/hoon/reference/rune/tis#-tistar) reference for more information on deferred expressions.

108

109−A virtual arm in an agent might look something like this:

109+A virtual arm in an agent often looks something like this:

110

111```hoon

112+* this .

@@ -114,8 +114,8 @@ A virtual arm in an agent might look something like this:

114 hc ~(. +> bowl)

115```

116

117−`this`, `def` and `hc` are the aliases, and next to each one is the hoon

117+`this`, `def` and `hc` are the deferred expressions, and next to each one is the Hoon

118−expresion it's aliasing. Notice that unlike most things that take _n_ arguments,

118+expression it evaluates whenever called. Notice that unlike most things that take _n_ arguments,

119a virtual arm is not terminated with a `==`. You can define as many aliases as

120you like. The three in this example are conventional ones you'd use in most

121agents you write. Their purposes are:

@@ -203,8 +203,8 @@ the build system will do that for us. In this case we've just added a single

203After that core, we call `agent:dbug` with our whole agent core as its argument.

204This allows us to use the `dbug` features described earlier.

205

206−Inside our agent `door`, we've added an extra virtual arm and defined a couple

206+Inside our agent door, we've added an extra virtual arm and defined a couple

207−of aliases:

207+deferred expressions:

208

209```hoon

210+* this .

@@ -212,9 +212,9 @@ of aliases:

212```

213

214In most of the arms, you see we've been able to replace the dummy code with

215−simple calls to the corresponding arms of `default-agent`, which we set up and

215+simple calls to the corresponding arms of `default-agent`, which we set up as a deferred

216−aliased as `def` in the virtual arm. We've also replaced the old `..on-init`

216+expression named `def` in the virtual arm. We've also replaced the old `..on-init`

217−with our alias `this` in the `on-init` arm as an example - it makes things a bit

217+with our deferred expression named `this` in the `on-init` arm as an example - it makes things a bit

218simpler.

219

220You can save the code above in `/app/skeleton.hoon` of your `%base` desk like

@@ -262,15 +262,15 @@ idea of its basic usage.

262

263The key takeaways are:

264

265−- Libraries can be imported with `/+`.

265+- Libraries are imported with `/+`.

266−- `default-agent` is a library that provides default behaviours for Gall agent

266+- `default-agent` is a library that provides default behaviors for Gall agent

267 arms.

268- `dbug` is a library that lets you inspect the state and `bowl` of an agent

269 from the dojo, with the `+dbug` generator.

270−- Convenient aliases for hoon expressions can be defined in a virtual arm with

270+- Convenient deferred expressions for Hoon expressions can be defined in a virtual arm with

271 the [lustar](/docs/hoon/reference/rune/lus#-lustar) (`+*`) rune.

272−- `this` is a conventional alias for the agent core itself.

272+- `this` is a conventional deferred expression name for the agent core itself.

273−- `def` is a conventional alias for accessing arms in the `default-agent`

273+- `def` is a conventional deferred expression name for accessing arms in the `default-agent`

274 library.

275- Extra cores can be composed into the subject of the agent core. The

276 composition is done implicitly by the build system. Typically we'd include one

content/docs/userspace/gall-guide/4-lifecycle.md+2−2

@@ -320,7 +320,7 @@ Let's try inspecting our state with `dbug`:

320

321```

322> [%0 val=42]

323−> :state-test +dbug

323+> :lifecycle +dbug

324>=

325```

326

@@ -328,7 +328,7 @@ Let's try inspecting our state with `dbug`:

328

329```

330> 42

331−> :state-test +dbug [%state %val]

331+> :lifecycle +dbug [%state %val]

332>=

333```

334

content/docs/userspace/gall-guide/5-cards.md+4−4

@@ -86,7 +86,7 @@ The type of the next field is a `note:agent:gall` (henceforth just `note`), whic

86- An `%arvo` `note` is a request to a vane. We'll discuss such requests

87 [below](#note-arvo).

88- A `%pyre` `note` is used to abort an event. It's mostly used internally by

89− Kiln, it's unlikely you'd use it in your own agent. The `tang` contains an

89+ `kiln` (a submodule of `%hood`), it's unlikely you'd use it in your own agent. The `tang` contains an

90 error message.

92### `task`

@@ -135,11 +135,11 @@ Unlike subscriptions, these are just one-off messages.

135

136A `%poke` contains a `cage` of some data. A `cage` is a cell of `[mark vase]`.

137The `mark` is just a `@tas` like `%foo`, and corresponds to a mark file in the

138−`/mar` directory. We'll cover marks in greater detail later. The `vase` contains

138+`/mar` directory. We'll cover `mark`s in greater detail later. The `vase` contains

139the actual data you're sending.

140

141−The `%poke-as` task is the same as `%poke` except Gall will convert the `cage`

141+The `%poke-as` task is the same as `%poke` except Gall will convert the `mark`

142−to the `mark` you specify before sending it off.

142+in the `cage` to the `mark` you specify before sending it off.

143

144**Examples**

145

content/docs/userspace/gall-guide/7-sur-and-marks.md+9−9

@@ -183,7 +183,7 @@ corresponds to its `mark` before being delivered to the agent. If the remote

183data has no corresponding mark in `/mar` or it fails validation, it will crash

184before it touches the agent.

185

186−A mark file is a `door` with three arms. The door's sample is the data type the

186+A mark file is a door with exactly three arms. The door's sample is the data type the

187mark will handle. For example, the sample of the `%noun` mark is just `non=*`,

188since it handles any noun. The three arms are as follows:

189

@@ -221,10 +221,10 @@ Here's a very simple mark file for the `action` structure we created in the

221```

222

223We've imported the `/sur/todo.hoon` structure library from the previous section,

224−and we've defined the sample of the `door` as `=action:todo`, since that's what

224+and we've defined the sample of the door as `=action:todo`, since that's what

225it will handle. Now let's consider the arms:

226

227−- `grab`: This handles convertion methods _to_ our mark. It contains a core with

227+- `grab`: This handles conversion methods _to_ our mark. It contains a core with

228 arm names corresponding to other marks. In this case, it can only convert from

229 a `noun` mark, so that's the core's only arm. The `noun` arm simply calls the

230 `action` structure from our structure library. This is called "clamming" or

@@ -233,7 +233,7 @@ it will handle. Now let's consider the arms:

233- `grow`: This handles conversion methods _from_ our mark. Like `grab`, it

234 contains a core with arm names corresponding to other marks. Here we've also

235 only added an arm for a `%noun` mark. In this case, `action` data will come in

236− as the sample of our `door`, and the `noun` arm simply returns it, since it's

236+ as the sample of our door, and the `noun` arm simply returns it, since it's

237 already a noun (as everything is in Hoon).

238- `grad`: This is the revision control arm, and as you can see we've simply

239 delegated it to the `%noun` mark.

@@ -277,9 +277,9 @@ just contains the `@p` of the local ship. The `src` field contains the `@p` of

277the ship from which the event originated.

278

279When messages come in over Ames from other ships on the network, they're

280−encrypted with our ship's public keys and signed by the ship which sent them.

280+[encrypted](/docs/arvo/ames/cryptography) with our ship's public keys and signed by the ship which sent them.

281The Ames vane decrypts and verifies the messages using keys in the Jael vane,

282−which are obtained from the Azimuth Ethereum contract where Urbit ID ownership

282+which are obtained from the [Azimuth Ethereum contract](/docs/azimuth/azimuth-eth) and [Layer 2 data](/docs/azimuth/l2/layer2) where Urbit ID ownership

283and keys are recorded. This means the originating `@p` of all messages are

284cryptographically validated before being passed on to Gall, so the `@p`

285specified in the `src` field of the `bowl` can be trusted to be correct, and

@@ -328,10 +328,10 @@ Type definitions:

328- An agent's type definitions live in the `/sur` directory of a desk.

329- The `/sur` file is a core, typically containing a number of lusbuc (`+$`)

330 arms.

331−- `/sur` files can be imported with the fashep (`/-`) Ford rune at the beginning

331+- `/sur` files are imported with the fashep (`/-`) Ford rune at the beginning

332 of a file.

333- Agent API types, for pokes and updates to subscribers, are commonly defined as

334− head-tagged unions.

334+ head-tagged unions such as `[%foo bar=baz]`.

335

336Mark files:

337

@@ -339,7 +339,7 @@ Mark files:

339- A `mark` like `%foo` corresponds to a file in `/mar` like `/mar/foo.hoon`

340- Marks are file types in Clay, but are also used for passing data between

341 agents as well as for external data generally.

342−- A mark file is a `door` with a sample of the data type it handles and three

342+- A mark file is a door with a sample of the data type it handles and exactly three

343 arms: `grab`, `grow` and `grad`.

344- `grab` and `grow` each contain a core with arm names corresponding to other marks.

345- `grab` and `grow` define functions for converting to and from our mark,

content/docs/userspace/gall-guide/9-vanes.md+2

@@ -232,6 +232,8 @@ to `on-arvo`, on the `wire` we specified (`/timers`). Here's the `on-arvo` arm:

232 ==

233```

234

235+We remark that, just like in the case of agent-agent communication, `gift`s from Arvo are also routed `wire` before `sign-arvo`.

236+

235First we check the `wire` is `/timers`, and then we check the `sign-arvo` begins

237First we check the `wire` is `/timers`, and then we check the `sign-arvo` begins

236with `[%behn %wake ....]`. Behn's `%wake` gift has the following format:

238with `[%behn %wake ....]`. Behn's `%wake` gift has the following format:

237

239

content/docs/userspace/gall-guide/types.md+3−3

@@ -58,7 +58,7 @@ dojo:

58```

60You would typically use `!>` as part of a [`cage`](#cage) when you're

61−constructing a `card` like a poke or a `%fact` gift to be sent off.

61+constructing a `card` like a poke or a `%fact` `gift` to be sent off.

63### Extract data from `vase`

@@ -90,7 +90,7 @@ Now let's try asking for a `@p` rather than `@t`:

90nest-fail

91```

93−As you can see, it will crash if the type does not exactly match. Note that

93+As you can see, it will crash if the type does not nest. Note that

94rather than using `!<`, you can also just clam the tail of the vase like:

96```

@@ -156,7 +156,7 @@ a Gall agent, a `path` is most commonly a subscription path - you might

156subscribe for updates to `/foo/bar` on another agent, or another agent might

157subscribe to `/baz` on your agent.

158

159−A `path` might just be a series of fixed elements like `/foo/bar`, but some

159+A `path` might just be a series of fixed `@ta` like `/foo/bar`, but some

160elements might also be variable and encode atom auras, or some other format. For

161example, you might like to include a date in the path like

162`/updates/~2021.10.31..07.24.27..db68`. Other agents might create the path by