Am 19.06.2021 um 10:54 schrieb Alan Painter
alan(_dot_)painter(_at_)gmail(_dot_)com:
But I'm wondering what the equivalent would be for conditional map
entries.
Supposing that there is an additional optional attribute on the 'book'
element of the original xml, 'out-of-print="true"'.
Furthermore, let's say that the JSON maps in the 'books' array contain
an additional field when a book is out of print.
In XSLT map entries, you can write:
<xsl:map>
<xsl:map-entry key="'title'" select="title!string()"
/>
<xsl:map-entry key="'authors'" select="array { ./author!string()
}" />
<xsl:if test="@out-of-print and @out-of-print eq 'true'" >
<xsl:map-entry key="'out-of-print'" select="true()" />
</xsl:if>
</xsl:map>
But I'm thinking that there is not a way to express this with the 'map
{ ... }' form in xpath.
map {
'title' : title!string(),
'authors' : array { author/string() },
( 'out-of-print' : true() )[@out-of-print and @out-of-print eq 'true']
}
Is there any way of doing something like this using in-line xpath?
My first instinct would be that the data is more consistent if you just do
<xsl:template match="/">
<xsl:sequence
select="map {
'books' : array {
books/book ! map {
'title' : title!string(),
'authors' : array { author/string() },
'out-of-print' : @out-of-print = 'true'
}
}
}"/>
</xsl:template>
i.e. give any map representing a book a property of the name
out-of-print with the right value.
Otherwise I think you can use map:merge
<xsl:template match="/">
<xsl:sequence
select="map {
'books' : array {
books/book !
map:merge((
map {
'title' : title!string(),
'authors' : array { author/string() }
},
@out-of-print ! map:entry(local-name(), boolean(.)))
)
}
}"/>
</xsl:template>
with xmlns:map="http://www.w3.org/2005/xpath-functions/map";
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