On 12.02.2019 15:40, Michael Kay mike(_at_)saxonica(_dot_)com wrote:
I'm having trouble understanding/reproducing this. Can you supply a complete
repro? (I.e., the source data that results in this error)
The example JSON is e.g.
{
"locations" : [
{
"id" : "i1",
"types" : [
{
"name" : "foo"
},
{
"name" : "bar"
}
]
},
{
"id" : "i2",
"types" : [
{
"name" : "baz"
}
]
},
{
"id" : "i3",
"types" : [
{
"name" : "foo"
},
{
"name" : "baz"
}
]
}
]
}
If you pass it to the parse-json function and use the result as the
context item to the three XPath expressions I have posted then the first
one gives that error while the other two return two maps.
A complete repro in XSLT is
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
exclude-result-prefixes="#all"
version="3.0">
<xsl:output method="adaptive"/>
<xsl:param name="json" as="xs:string">
{
"locations" : [
{
"id" : "i1",
"types" : [
{
"name" : "foo"
},
{
"name" : "bar"
}
]
},
{
"id" : "i2",
"types" : [
{
"name" : "baz"
}
]
},
{
"id" : "i3",
"types" : [
{
"name" : "foo"
},
{
"name" : "baz"
}
]
}
]
}
</xsl:param>
<xsl:template match="/" name="xsl:initial-template">
<xsl:sequence select="parse-json($json)?locations?*[?types?*[?name
= 'foo']]"/>
</xsl:template>
</xsl:stylesheet>
On 11 Feb 2019, at 12:09, Martin Honnen martin(_dot_)honnen(_at_)gmx(_dot_)de
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
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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