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definition:
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opt :: XmlConv _ _ a -> XOptConv (Maybe a)
opt xa = Conv rd sh
where
rd childs = ret Nothing childs
? (xmlReads xa />= ret . Just) childs
sh Nothing = id
sh (Just a) = xmlShows xa a
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demand:
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no demanded arguments
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deterministic:
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possibly non-deterministic operation
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documentation:
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--- Creates a converter for arbitrary optional XML data. Optional XML data
--- must not be used in repetitions and does not represent an XML element.
---
--- @param conv XML converter
--- @return XML converter for optional data represented by the given converter
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failfree:
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_
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indeterministic:
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referentially transparent operation
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infix:
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no fixity defined
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iotype:
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{(_) |-> {Conv}}
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name:
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opt
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precedence:
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no precedence defined
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result-values:
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{Conv}
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signature:
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XmlConv a b c -> XmlConv NotRepeatable NoElem (Prelude.Maybe c)
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solution-complete:
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operation might suspend on free variables
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terminating:
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yes
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totally-defined:
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reducible on all ground data terms
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