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<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">On 26.07.2022 21:43, "Brian Goetz" <brian.goetz@oracle.com> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-US" style="font-size:11.0pt">To be more specific about the actual classes:</span><span lang="EN-US" style="font-size:11.0pt">
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<span lang="EN-US" style="font-size:11.0pt">Mapping accepts only fragments, because it must render as single line and for example in XML it renders as single element with attributes.</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
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OK, so this unearths a previously unstated requirement: that we be able to turn certain maps into attributes, rather than embedded elements, when converting to XML. Does this requirement correspond to anything in other formats? Do we gain anything by dropping
this, and formatting always to elements, and/or using other heuristics to determine when we can get away with this format optimization?
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In general, I'd like to unearth more of this sort of requirements. Looking at the current hierarchy, I can't help but feel we've not yet "hit bottom"; it doesn't feel factored into separate concerns yet. But I'm optimistic we can get there.
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Here's a naive decomposition, which looks a lot like the JSON spec if you squint:
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Value = SimpleValue(ConstantDesc) | ListValue(List<Value>) | MapValue(Map<String, Value>)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Association with Java Maps and Lists is a mistake here. Every value must be named because every XML element or attribute must have a name and there is not a difference between rendering block list and block
map in XML.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Mapping is a collection of named entries, where the keys are rendered in all formats.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">List is a collection of named entries, where the keys are rendered in XML only.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">We can make it more “square” and intuitive to Java developers as you propose, if we drop XML format.<o:p></o:p></span></p>
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