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When using XPath 3.1 (e.g. in XSLT 3) on maps I have found that I have
to change my coding habit a bit when writing predicates that want to
check the existence of some nested map, while I hoped to be able to
write e.g.
?locations?*[?types?*[?name = 'foo']] to select all (map) members of the "locations" array that have a "types" array with at least one (map) member having a property "name" with value "foo" I get an error Effective boolean value is not defined for sequence starting with an atomic value other than a boolean, number, or string So in contrast to my experience with writing predicates on XML it seems for maps I have to explicitly use the "exists" function e.g. ?locations?*[exists(?types?*[?name = 'foo'])] or a "some .. in" expression ?locations?*[some $m in ?types?* satisfies $m?name = 'foo'] Is there any more compact way to write such a check? What is the reason that the effective boolean value was not extended to give true for a sequence with a map?
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