XSLT WMS GetCapabilities to JSON - json

Question

I am trying to convert the GetCapabilities of the GeoMet WMS XML response.data to a JSON that can be used in a v-treeview Vuetify component such as in this link.
testfunc: function () {
axios.get('https://geo.weather.gc.ca/geomet?lang=en&service=WMS&version=1.3.0&request=GetCapabilities').then((response) => {
const xslt = `<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="#all"
xmlns="http://www.w3.org/2005/xpath-functions"
xmlns:mf="http://example.com/mf"
expand-text="yes"
version="3.0">
<xsl:strip-space elements="*"/>
<xsl:output method="json" build-tree="no"/>
<xsl:template match="/Layer" priority="5">
<xsl:map>
<xsl:apply-templates/>
</xsl:map>
</xsl:template>
<xsl:template match="*[not(*)]">
<xsl:map-entry key="local-name()" select="data()"/>
</xsl:template>
<xsl:template match="Layer[1]">
<xsl:map-entry key="'children'">
<xsl:sequence select="array { mf:apply-templates(*) }"/>
</xsl:map-entry>
</xsl:template>
<xsl:template match="Layer[position() > 1]"/>
<xsl:function name="mf:apply-templates" as="item()*">
<xsl:param name="elements" as="element(*)*"/>
<xsl:apply-templates select="$elements"/>
</xsl:function>
</xsl:stylesheet>`
const jsonResult = SaxonJS.XPath.evaluate(`
transform(
map {
'source-node' : parse-xml($xml),
'stylesheet-text' : $xslt,
'delivery-format' : 'raw'
}
)?output`,
[],
{ 'params': { 'xml': response.data, 'xslt': xslt } }
)
console.log(jsonResult)
})
}
My test function returns all the infromations and does not really parse the XML response the way I need it to and I am new to XSLT. I need something that will return only the <Name> and <Title> innerHTML of the <Layer> tags and their children in arrays called children that looks like :
{
title: 'Title Level 1'
name: 'Name Level 1'
children: [
{
title: 'Title Level 2'
name: 'Name Level 2'
children: [
{
title: 'Title Level 3-1'
name: 'Name Level 3-1'
},
{
title: 'Title Level 3-2'
name: 'Name Level 3-2'
}
]
]
}
EDIT : Sample XML of the full XML which has one root with only a title that has 14 groups of
<Layer queryable="1">
<Title>MSC GeoMet — GeoMet-Weather 2.14.1</Title>
<Layer queryable="1">
<Name>Regional Deterministic Prediction System (RDPS) [10 km]</Name>
<Title>Regional Deterministic Prediction System (RDPS) [10 km]</Title>
<Layer queryable="1">
<Name>RDPS - Coupled to Gulf of St. Lawrence (RDPS-CGSL)</Name>
<Title>RDPS - Coupled to Gulf of St. Lawrence (RDPS-CGSL)</Title>
<Layer queryable="1" opaque="0" cascaded="0">
<Name>CGSL.ETA_ICEC</Name>
<Title>CGSL.ETA.ICEC - Ice cover fraction</Title>
...

Answer 1

An XSLT 3 sample to process only Layer elements (in that particular namespace http://www.opengis.net/wms) and the first Title and Name plus recursively the child Layers would be
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:mf="http://example.com/mf"
exclude-result-prefixes="#all"
xpath-default-namespace="http://www.opengis.net/wms"
xmlns="http://www.w3.org/2005/xpath-functions"
expand-text="yes"
version="3.0">
<xsl:strip-space elements="*"/>
<xsl:mode on-no-match="shallow-skip"/>
<xsl:output method="json" build-tree="no" indent="yes"/>
<xsl:template match="/WMS_Capabilities/Capability/Layer" priority="5">
<xsl:map>
<xsl:apply-templates/>
</xsl:map>
</xsl:template>
<xsl:template match="Layer/Title[1] | Layer/Name[1]">
<xsl:map-entry key="local-name()" select="data()"/>
</xsl:template>
<xsl:template match="Layer[1]">
<xsl:map-entry key="'children'">
<xsl:sequence select="array { ../Layer/mf:apply-templates(.) }"/>
</xsl:map-entry>
</xsl:template>
<xsl:template match="Layer[position() > 1]"/>
<xsl:function name="mf:apply-templates" as="item()*">
<xsl:param name="elements" as="element(*)*"/>
<xsl:map>
<xsl:apply-templates select="$elements/*"/>
</xsl:map>
</xsl:function>
</xsl:stylesheet>