This recursive definition also works - the difference is that the inner 
:html/element is not wrapped in s/spec:

(s/def :html/element
  (s/cat
    :tag keyword?
    :attrs map?
    :children (s/* (s/alt :element :html/element
                          :string  string?))))

I'm a bit confused about when recursion works and when it doesn't

On Thursday, 6 October 2016 21:52:07 UTC+3, Aaron wrote:
>
> Well I'm referring to the OP's original example:
>
> (s/def :html/element
>>   (s/cat
>>    :tag keyword?
>>    :attrs map?
>>    :children (s/* (s/alt :element (s/spec :html/element)
>>                          :string  string?))))
>>
>> The exception says: "Unable to resolve spec: :html/element".
>>
>
> On Thursday, October 6, 2016 at 7:43:14 AM UTC-4, Alex Miller wrote:
>>
>> Can you share a specific case? 
>
>

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