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<link rel="stylesheet" href="../../coverage.css"/> <title> dog_and_duck/quack/quack.clj </title>
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<span class="covered" title="1 out of 1 forms covered">
001&nbsp;&nbsp;(ns&nbsp;dog-and-duck.quack.quack
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002&nbsp;&nbsp;&nbsp;&nbsp;&quot;Validator&nbsp;for&nbsp;ActivityPub&nbsp;objects:&nbsp;if&nbsp;it&nbsp;walks&nbsp;like&nbsp;a&nbsp;duck,&nbsp;and&nbsp;it&nbsp;quacks&nbsp;
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003&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;like&nbsp;a&nbsp;duck...
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004&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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005&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**NOTE&nbsp;THAT&nbsp;the&nbsp;ActivityPub&nbsp;spec&nbsp;
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006&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[says](https:&#x2F;&#x2F;www.w3.org&#x2F;TR&#x2F;activitypub&#x2F;#obj)
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007&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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008&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&gt;&nbsp;Servers&nbsp;SHOULD&nbsp;validate&nbsp;the&nbsp;content&nbsp;they&nbsp;receive&nbsp;to&nbsp;avoid&nbsp;content&nbsp;
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009&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&gt;&nbsp;spoofing&nbsp;attacks
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010&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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011&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;but&nbsp;in&nbsp;practice&nbsp;ActivityPub&nbsp;content&nbsp;collected&nbsp;in&nbsp;the&nbsp;wild&nbsp;bears&nbsp;only&nbsp;
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012&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a&nbsp;hazy&nbsp;relationship&nbsp;to&nbsp;the&nbsp;spec,&nbsp;so&nbsp;this&nbsp;is&nbsp;difficult.&nbsp;I&nbsp;suspect&nbsp;that
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013&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I&nbsp;may&nbsp;have&nbsp;to&nbsp;implement&nbsp;a&nbsp;`*strict*`&nbsp;dynamic&nbsp;variable,&nbsp;so&nbsp;that&nbsp;users&nbsp;can&nbsp;
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014&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;toggle&nbsp;some&nbsp;checks&nbsp;off.&quot;
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015&nbsp;&nbsp;
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016&nbsp;&nbsp;&nbsp;&nbsp;(:require&nbsp;[dog-and-duck.quack.picky&nbsp;:refer&nbsp;[*reject-severity*&nbsp;activity-faults
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017&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;actor-faults&nbsp;filter-severity&nbsp;link-faults
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018&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;object-faults&nbsp;persistent-object-faults]])
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019&nbsp;&nbsp;
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020&nbsp;&nbsp;&nbsp;&nbsp;(:import&nbsp;[java.net&nbsp;URI&nbsp;URISyntaxException]))
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021&nbsp;&nbsp;
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022&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Copyright&nbsp;(C)&nbsp;Simon&nbsp;Brooke,&nbsp;2022
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023&nbsp;&nbsp;
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024&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This&nbsp;program&nbsp;is&nbsp;free&nbsp;software;&nbsp;you&nbsp;can&nbsp;redistribute&nbsp;it&nbsp;and&#x2F;or
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025&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;modify&nbsp;it&nbsp;under&nbsp;the&nbsp;terms&nbsp;of&nbsp;the&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License
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026&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;as&nbsp;published&nbsp;by&nbsp;the&nbsp;Free&nbsp;Software&nbsp;Foundation;&nbsp;either&nbsp;version&nbsp;2
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027&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;of&nbsp;the&nbsp;License,&nbsp;or&nbsp;(at&nbsp;your&nbsp;option)&nbsp;any&nbsp;later&nbsp;version.
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028&nbsp;&nbsp;
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029&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This&nbsp;program&nbsp;is&nbsp;distributed&nbsp;in&nbsp;the&nbsp;hope&nbsp;that&nbsp;it&nbsp;will&nbsp;be&nbsp;useful,
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030&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;but&nbsp;WITHOUT&nbsp;ANY&nbsp;WARRANTY;&nbsp;without&nbsp;even&nbsp;the&nbsp;implied&nbsp;warranty&nbsp;of
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031&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MERCHANTABILITY&nbsp;or&nbsp;FITNESS&nbsp;FOR&nbsp;A&nbsp;PARTICULAR&nbsp;PURPOSE.&nbsp;&nbsp;See&nbsp;the
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032&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License&nbsp;for&nbsp;more&nbsp;details.
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033&nbsp;&nbsp;
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034&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You&nbsp;should&nbsp;have&nbsp;received&nbsp;a&nbsp;copy&nbsp;of&nbsp;the&nbsp;GNU&nbsp;General&nbsp;Public&nbsp;License
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035&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;along&nbsp;with&nbsp;this&nbsp;program;&nbsp;if&nbsp;not,&nbsp;write&nbsp;to&nbsp;the&nbsp;Free&nbsp;Software
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036&nbsp;&nbsp;;;;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Foundation,&nbsp;Inc.,&nbsp;51&nbsp;Franklin&nbsp;Street,&nbsp;Fifth&nbsp;Floor,&nbsp;Boston,&nbsp;MA&nbsp;&nbsp;02110-1301,&nbsp;USA.
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037&nbsp;&nbsp;
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038&nbsp;&nbsp;(defn&nbsp;object?
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039&nbsp;&nbsp;&nbsp;&nbsp;&quot;Returns&nbsp;`true`&nbsp;iff&nbsp;`x`&nbsp;is&nbsp;recognisably&nbsp;an&nbsp;ActivityStreams&nbsp;object.
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040&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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041&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**NOTE&nbsp;THAT**&nbsp;The&nbsp;ActivityStreams&nbsp;spec&nbsp;
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042&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[says](https:&#x2F;&#x2F;www.w3.org&#x2F;TR&#x2F;activitystreams-core&#x2F;#object):
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043&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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044&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&gt;&nbsp;All&nbsp;properties&nbsp;are&nbsp;optional&nbsp;(including&nbsp;the&nbsp;id&nbsp;and&nbsp;type)
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045&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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046&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;But&nbsp;we&nbsp;are&nbsp;*just&nbsp;not&nbsp;having&nbsp;that*,&nbsp;because&nbsp;otherwise&nbsp;we&#x27;re&nbsp;flying&nbsp;blind.
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047&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We&nbsp;*shall*&nbsp;reject&nbsp;objects&nbsp;lacking&nbsp;at&nbsp;least&nbsp;`:type`.&nbsp;Missing&nbsp;`:id`&nbsp;keys&nbsp;are
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048&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;tolerable&nbsp;because&nbsp;they&nbsp;represent&nbsp;transient&nbsp;objects,&nbsp;which&nbsp;we&nbsp;expect&nbsp;to&nbsp;
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049&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;handle.
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050&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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051&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**NOTE&nbsp;THAT**&nbsp;The&nbsp;ActivityPub&nbsp;spec&nbsp;[says](https:&#x2F;&#x2F;www.w3.org&#x2F;TR&#x2F;activitypub&#x2F;#obj)
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052&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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053&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&gt;&nbsp;Implementers&nbsp;SHOULD&nbsp;include&nbsp;the&nbsp;ActivityPub&nbsp;context&nbsp;in&nbsp;their&nbsp;object&nbsp;
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054&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&gt;&nbsp;definitions
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055&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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056&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;but&nbsp;in&nbsp;samples&nbsp;found&nbsp;in&nbsp;the&nbsp;wild&nbsp;they&nbsp;typically&nbsp;don&#x27;t.&quot;
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057&nbsp;&nbsp;&nbsp;&nbsp;([x]
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<span class="covered" title="4 out of 4 forms covered">
058&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(object?&nbsp;x&nbsp;*reject-severity*))
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<span class="not-tracked" title="0 out of 0 forms covered">
059&nbsp;&nbsp;&nbsp;&nbsp;([x&nbsp;severity]
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<span class="covered" title="8 out of 8 forms covered">
060&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(empty?&nbsp;(filter-severity&nbsp;(object-faults&nbsp;x)&nbsp;severity))))
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061&nbsp;&nbsp;
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<span class="covered" title="1 out of 1 forms covered">
062&nbsp;&nbsp;(defn&nbsp;persistent-object?
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063&nbsp;&nbsp;&nbsp;&nbsp;&quot;`true`&nbsp;iff&nbsp;`x`&nbsp;is&nbsp;a&nbsp;persistent&nbsp;object.
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064&nbsp;&nbsp;
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065&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transient&nbsp;objects&nbsp;in&nbsp;ActivityPub&nbsp;are&nbsp;not&nbsp;required&nbsp;to&nbsp;have&nbsp;an&nbsp;`id`&nbsp;key,&nbsp;but&nbsp;persistent
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066&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ones&nbsp;must&nbsp;have&nbsp;a&nbsp;key,&nbsp;and&nbsp;it&nbsp;must&nbsp;be&nbsp;an&nbsp;IRI&nbsp;(but&nbsp;normally&nbsp;a&nbsp;URI).&quot;
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067&nbsp;&nbsp;&nbsp;&nbsp;([x]
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<span class="covered" title="4 out of 4 forms covered">
068&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(persistent-object?&nbsp;x&nbsp;*reject-severity*))
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<span class="not-tracked" title="0 out of 0 forms covered">
069&nbsp;&nbsp;&nbsp;&nbsp;([x&nbsp;severity]
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<span class="covered" title="8 out of 8 forms covered">
070&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(empty?&nbsp;(filter-severity&nbsp;(persistent-object-faults&nbsp;x)&nbsp;severity))))
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<span class="blank" title="0 out of 0 forms covered">
071&nbsp;&nbsp;
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<span class="covered" title="1 out of 1 forms covered">
072&nbsp;&nbsp;(defn&nbsp;actor?
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073&nbsp;&nbsp;&nbsp;&nbsp;&quot;Returns&nbsp;`true`&nbsp;if&nbsp;`x`&nbsp;quacks&nbsp;like&nbsp;an&nbsp;actor,&nbsp;else&nbsp;false.&quot;
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<span class="covered" title="4 out of 4 forms covered">
074&nbsp;&nbsp;&nbsp;&nbsp;([x]&nbsp;(actor?&nbsp;x&nbsp;*reject-severity*))
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<span class="not-tracked" title="0 out of 0 forms covered">
075&nbsp;&nbsp;&nbsp;&nbsp;([x&nbsp;severity]
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<span class="covered" title="8 out of 8 forms covered">
076&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(empty?&nbsp;(filter-severity&nbsp;(actor-faults&nbsp;x)&nbsp;severity))))
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<span class="blank" title="0 out of 0 forms covered">
077&nbsp;&nbsp;
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<span class="covered" title="1 out of 1 forms covered">
078&nbsp;&nbsp;(defn&nbsp;actor-or-uri?
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079&nbsp;&nbsp;&nbsp;&nbsp;&quot;`true`&nbsp;if&nbsp;`x`&nbsp;is&nbsp;either&nbsp;a&nbsp;URI&nbsp;or&nbsp;an&nbsp;actor.
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080&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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081&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**TODO**:&nbsp;I&nbsp;need&nbsp;to&nbsp;decide&nbsp;about&nbsp;whether&nbsp;to&nbsp;reify&nbsp;referenced&nbsp;objects
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082&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;before&nbsp;validation&nbsp;or&nbsp;after.&nbsp;After&nbsp;reification,&nbsp;every&nbsp;reference&nbsp;to&nbsp;an&nbsp;actor
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083&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*must&nbsp;be*&nbsp;to&nbsp;an&nbsp;actor&nbsp;object,&nbsp;but&nbsp;before,&nbsp;may&nbsp;only&nbsp;be&nbsp;to&nbsp;a&nbsp;URI&nbsp;pointing&nbsp;to&nbsp;
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084&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;one.&quot;
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085&nbsp;&nbsp;&nbsp;&nbsp;[x]
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<span class="not-covered" title="0 out of 3 forms covered">
086&nbsp;&nbsp;&nbsp;&nbsp;(try
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<span class="not-covered" title="0 out of 5 forms covered">
087&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(and
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<span class="not-covered" title="0 out of 9 forms covered">
088&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(string?&nbsp;x)&nbsp;(uri?&nbsp;(URI.&nbsp;x))
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<span class="not-covered" title="0 out of 3 forms covered">
089&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:else&nbsp;(actor?&nbsp;x))
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<span class="not-tracked" title="0 out of 0 forms covered">
090&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;true)
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<span class="not-tracked" title="0 out of 0 forms covered">
091&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(catch&nbsp;URISyntaxException&nbsp;_&nbsp;false)
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<span class="not-tracked" title="0 out of 0 forms covered">
092&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(catch&nbsp;NullPointerException&nbsp;_&nbsp;false)))
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<span class="blank" title="0 out of 0 forms covered">
093&nbsp;&nbsp;
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<span class="covered" title="1 out of 1 forms covered">
094&nbsp;&nbsp;(defn&nbsp;activity?
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095&nbsp;&nbsp;&nbsp;&nbsp;&quot;`true`&nbsp;iff&nbsp;`x`&nbsp;quacks&nbsp;like&nbsp;an&nbsp;activity,&nbsp;else&nbsp;false.&quot;
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<span class="not-covered" title="0 out of 4 forms covered">
096&nbsp;&nbsp;&nbsp;&nbsp;([x]&nbsp;(activity?&nbsp;x&nbsp;*reject-severity*))
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<span class="not-tracked" title="0 out of 0 forms covered">
097&nbsp;&nbsp;&nbsp;&nbsp;([x&nbsp;severity]
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<span class="not-covered" title="0 out of 8 forms covered">
098&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(empty?&nbsp;(filter-severity&nbsp;(activity-faults&nbsp;x)&nbsp;severity))))
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<span class="blank" title="0 out of 0 forms covered">
099&nbsp;&nbsp;
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<span class="covered" title="1 out of 1 forms covered">
100&nbsp;&nbsp;(defn&nbsp;link?
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101&nbsp;&nbsp;&nbsp;&nbsp;&quot;`true`&nbsp;iff&nbsp;`x`&nbsp;quacks&nbsp;like&nbsp;a&nbsp;link,&nbsp;else&nbsp;false.&quot;
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<span class="not-covered" title="0 out of 4 forms covered">
102&nbsp;&nbsp;&nbsp;&nbsp;([x]&nbsp;(link?&nbsp;x&nbsp;*reject-severity*))
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<span class="not-tracked" title="0 out of 0 forms covered">
103&nbsp;&nbsp;&nbsp;&nbsp;([x&nbsp;severity]
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<span class="not-covered" title="0 out of 8 forms covered">
104&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(empty?&nbsp;(filter-severity&nbsp;(link-faults&nbsp;x)&nbsp;severity))))
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<span class="blank" title="0 out of 0 forms covered">
105&nbsp;&nbsp;
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<span class="covered" title="1 out of 1 forms covered">
106&nbsp;&nbsp;(defn&nbsp;link-or-uri?
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<span class="not-tracked" title="0 out of 0 forms covered">
107&nbsp;&nbsp;&nbsp;&nbsp;&quot;`true`&nbsp;iff&nbsp;`x`&nbsp;is&nbsp;either&nbsp;a&nbsp;URI&nbsp;or&nbsp;a&nbsp;link,&nbsp;else&nbsp;false.
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
108&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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109&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;There&nbsp;are&nbsp;several&nbsp;points&nbsp;in&nbsp;the&nbsp;specification&nbsp;where&nbsp;e.g.&nbsp;the&nbsp;`:image`
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<span class="not-tracked" title="0 out of 0 forms covered">
110&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;property&nbsp;(if&nbsp;present)&nbsp;may&nbsp;be&nbsp;either&nbsp;a&nbsp;link&nbsp;or&nbsp;a&nbsp;URI.&quot;
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111&nbsp;&nbsp;&nbsp;&nbsp;[x]
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<span class="not-covered" title="0 out of 5 forms covered">
112&nbsp;&nbsp;&nbsp;&nbsp;(and
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<span class="not-covered" title="0 out of 9 forms covered">
113&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond&nbsp;(string?&nbsp;x)&nbsp;(uri?&nbsp;(URI.&nbsp;x))
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<span class="not-covered" title="0 out of 3 forms covered">
114&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:else&nbsp;(link?&nbsp;x))
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<span class="not-tracked" title="0 out of 0 forms covered">
115&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;true))
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116&nbsp;&nbsp;
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<span class="covered" title="1 out of 1 forms covered">
117&nbsp;&nbsp;(defn&nbsp;collection?
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118&nbsp;&nbsp;&nbsp;&nbsp;&quot;`true`&nbsp;iff&nbsp;`x`&nbsp;quacks&nbsp;like&nbsp;a&nbsp;collection&nbsp;of&nbsp;type&nbsp;`object-type`,&nbsp;else&nbsp;`false`.
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<span class="not-tracked" title="0 out of 0 forms covered">
119&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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<span class="not-tracked" title="0 out of 0 forms covered">
120&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;With&nbsp;one&nbsp;argument,&nbsp;will&nbsp;recognise&nbsp;plain&nbsp;collections&nbsp;and&nbsp;ordered&nbsp;collections,
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<span class="not-tracked" title="0 out of 0 forms covered">
121&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;but&nbsp;(currently)&nbsp;not&nbsp;collection&nbsp;pages.&quot;
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<span class="not-tracked" title="0 out of 0 forms covered">
122&nbsp;&nbsp;&nbsp;&nbsp;([x&nbsp;^String&nbsp;object-type]
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<span class="partial" title="10 out of 11 forms covered">
123&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(let&nbsp;[items&nbsp;(or&nbsp;(:items&nbsp;x)&nbsp;(:orderedItems&nbsp;x))]
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124&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(and
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<span class="partial" title="5 out of 6 forms covered">
125&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cond
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<span class="partial" title="3 out of 8 forms covered">
126&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(:items&nbsp;x)&nbsp;(nil?&nbsp;(:orderedItems&nbsp;x))
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<span class="covered" title="8 out of 8 forms covered">
127&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(:orderedItems&nbsp;x)&nbsp;(nil?&nbsp;(:items&nbsp;x))&nbsp;;;&nbsp;can&#x27;t&nbsp;have&nbsp;both&nbsp;properties
</span><br/>
<span class="covered" title="5 out of 5 forms covered">
128&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(integer?&nbsp;(:totalItems&nbsp;x))&nbsp;true&nbsp;;;&nbsp;can&nbsp;have&nbsp;neither,&nbsp;provided&nbsp;it&nbsp;has&nbsp;totalItems.
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:else&nbsp;false)
</span><br/>
<span class="covered" title="3 out of 3 forms covered">
130&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(object?&nbsp;x)
</span><br/>
<span class="covered" title="5 out of 5 forms covered">
131&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(=&nbsp;(:type&nbsp;x)&nbsp;object-type)
</span><br/>
<span class="partial" title="2 out of 3 forms covered">
132&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(if&nbsp;items
</span><br/>
<span class="partial" title="10 out of 12 forms covered">
133&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(and&nbsp;(coll?&nbsp;items)
</span><br/>
<span class="covered" title="4 out of 4 forms covered">
134&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(every?&nbsp;object?&nbsp;items)&nbsp;;;&nbsp;if&nbsp;there&nbsp;are&nbsp;items,&nbsp;they&nbsp;must&nbsp;form&nbsp;a
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
135&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;collection&nbsp;of&nbsp;objects.
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
136&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;true)
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
137&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;true)&nbsp;;;&nbsp;but&nbsp;it&#x27;s&nbsp;OK&nbsp;if&nbsp;there&nbsp;aren&#x27;t.
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
138&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;true)
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
139&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;test&nbsp;for&nbsp;totalItems&nbsp;not&nbsp;done&nbsp;here,&nbsp;because&nbsp;collection&nbsp;pages&nbsp;don&#x27;t
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
140&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;;&nbsp;have&nbsp;it.
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
141&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
142&nbsp;&nbsp;&nbsp;&nbsp;([x]
</span><br/>
<span class="not-covered" title="0 out of 9 forms covered">
143&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(and
</span><br/>
<span class="not-covered" title="0 out of 10 forms covered">
144&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(or&nbsp;(collection?&nbsp;x&nbsp;&quot;Collection&quot;)
</span><br/>
<span class="not-covered" title="0 out of 2 forms covered">
145&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(collection?&nbsp;x&nbsp;&quot;OrderedCollection&quot;))
</span><br/>
<span class="not-covered" title="0 out of 5 forms covered">
146&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(integer?&nbsp;(:totalItems&nbsp;x))
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
147&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;true)))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
148&nbsp;&nbsp;
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
149&nbsp;&nbsp;(defn&nbsp;unordered-collection?
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
150&nbsp;&nbsp;&nbsp;&nbsp;&quot;`true`&nbsp;iff&nbsp;`x`&nbsp;quacks&nbsp;like&nbsp;an&nbsp;unordered&nbsp;collection,&nbsp;else&nbsp;`false`.&quot;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
151&nbsp;&nbsp;&nbsp;&nbsp;[x]
</span><br/>
<span class="not-covered" title="0 out of 18 forms covered">
152&nbsp;&nbsp;&nbsp;&nbsp;(and&nbsp;(collection?&nbsp;x&nbsp;&quot;Collection&quot;)&nbsp;(integer?&nbsp;(:totalItems&nbsp;x))&nbsp;true))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
153&nbsp;&nbsp;
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
154&nbsp;&nbsp;(defn&nbsp;ordered-collection?
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
155&nbsp;&nbsp;&nbsp;&nbsp;&quot;`true`&nbsp;iff&nbsp;`x`&nbsp;quacks&nbsp;like&nbsp;an&nbsp;ordered&nbsp;collection,&nbsp;else&nbsp;`false`.&quot;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
156&nbsp;&nbsp;&nbsp;&nbsp;[x]
</span><br/>
<span class="not-covered" title="0 out of 18 forms covered">
157&nbsp;&nbsp;&nbsp;&nbsp;(and&nbsp;(collection?&nbsp;x&nbsp;&quot;OrderedCollection&quot;)&nbsp;(integer?&nbsp;(:totalItems&nbsp;x))&nbsp;true))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
158&nbsp;&nbsp;
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
159&nbsp;&nbsp;(defn&nbsp;collection-page?
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
160&nbsp;&nbsp;&nbsp;&nbsp;&quot;`true`&nbsp;iff&nbsp;`x`&nbsp;quacks&nbsp;like&nbsp;a&nbsp;page&nbsp;in&nbsp;a&nbsp;paged&nbsp;collection,&nbsp;else&nbsp;`false`.&quot;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
161&nbsp;&nbsp;&nbsp;&nbsp;[x]
</span><br/>
<span class="not-covered" title="0 out of 4 forms covered">
162&nbsp;&nbsp;&nbsp;&nbsp;(collection?&nbsp;x&nbsp;&quot;CollectionPage&quot;))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
163&nbsp;&nbsp;
</span><br/>
<span class="covered" title="1 out of 1 forms covered">
164&nbsp;&nbsp;(defn&nbsp;ordered-collection-page?
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
165&nbsp;&nbsp;&nbsp;&nbsp;&quot;`true`&nbsp;iff&nbsp;`x`&nbsp;quacks&nbsp;like&nbsp;a&nbsp;page&nbsp;in&nbsp;an&nbsp;ordered&nbsp;paged&nbsp;collection,&nbsp;else&nbsp;`false`.&quot;
</span><br/>
<span class="not-tracked" title="0 out of 0 forms covered">
166&nbsp;&nbsp;&nbsp;&nbsp;[x]
</span><br/>
<span class="covered" title="4 out of 4 forms covered">
167&nbsp;&nbsp;&nbsp;&nbsp;(collection?&nbsp;x&nbsp;&quot;OrderedCollectionPage&quot;))
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
168&nbsp;&nbsp;
</span><br/>
<span class="blank" title="0 out of 0 forms covered">
169&nbsp;&nbsp;
</span><br/>
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