我正在嘗試使用xsltprocxsl 檔案將 xml 檔案轉換為 GeoJSON 檔案。為此，我們正在嘗試轉換 xml 檔案和 xsl 檔案。我想要做的是22203-bldg-562在 xml 中獲取 gen:value 并將其放入id with-param. 我想把它with-param放在id. 但是當我進行轉換時，我收到以下錯誤。我認為我訪問“gen:value”的方法有誤。我不知道如何訪問 gen:value。我應該怎么辦？
$ xsltproc style.xsl 52383622_bldg_6697_op.gml > index.geojson
XPath error : Undefined namespace prefix
xmlXPathEval: 1 object left on the stack
xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:core="http://www.opengis.net/citygml/2.0" xmlns:bldg="http://www.opengis.net/citygml/building/2.0"
xmlns:gml="http://www.opengis.net/gml" xmlns:str="http://exslt.org/strings" extension-element-prefixes="str">
<xsl:output method="text" indent="no" encoding="UTF-8" />
<xsl:template match="/">
<xsl:apply-templates select="/core:CityModel/core:cityObjectMember/bldg:Building" />
</xsl:template>
<xsl:template match="bldg:Building" />
<xsl:template match="bldg:Building[bldg:lod0FootPrint][bldg:measuredHeight]">
<xsl:apply-templates select="bldg:lod0FootPrint//gml:Polygon">
<xsl:with-param name="z" select="number(bldg:measuredHeight)" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="bldg:Building[bldg:lod0RoofEdge][bldg:measuredHeight]">
<xsl:apply-templates select="bldg:lod0RoofEdge//gml:Polygon">
<xsl:with-param name="z" select="number(bldg:measuredHeight)" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="bldg:Building[gen:stringAttribute]">
<xsl:apply-templates select="bldg:lod0RoofEdge//gml:Polygon">
<xsl:with-param name="id" select="string(gen:value)" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="gml:Polygon">
<xsl:param name="z" />
<xsl:param name="id" />
<xsl:text>{"type":"Feature","properties":{"z":</xsl:text>
<xsl:value-of select="$z" />
<xsl:text>, "buildingId": </xsl:text>
<xsl:value-of select="$id" />
<xsl:text>},<xsl:text>
<xsl:text>"geometry":{"type":"Polygon","coordinates":[</xsl:text>
<xsl:for-each select=".//gml:posList">
<xsl:if test="position()!=1">,</xsl:if>
<xsl:text>[</xsl:text>
<xsl:variable name="t" select="str:split(.)" />
<xsl:for-each select="$t[position() mod 3 = 1]">
<xsl:variable name="i" select="position()" />
<xsl:if test="$i != 1">,</xsl:if>
<xsl:value-of select="concat('[',$t[$i*3-1],',',string(.),']')" />
</xsl:for-each>
<xsl:text>]</xsl:text>
</xsl:for-each>
<xsl:text>]}} </xsl:text>
</xsl:template>
</xsl:stylesheet>
xml
<?xml version="1.0" encoding="UTF-8"?>
<core:CityModel xmlns:grp="http://www.opengis.net/citygml/cityobjectgroup/2.0" xmlns:core="http://www.opengis.net/citygml/2.0" xmlns:pbase="http://www.opengis.net/citygml/profiles/base/2.0" xmlns:smil20lang="http://www.w3.org/2001/SMIL20/Language" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:smil20="http://www.w3.org/2001/SMIL20/" xmlns:bldg="http://www.opengis.net/citygml/building/2.0" xmlns:xAL="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0" xmlns:uro="http://www.kantei.go.jp/jp/singi/tiiki/toshisaisei/itoshisaisei/iur/uro/1.4" xmlns:luse="http://www.opengis.net/citygml/landuse/2.0" xmlns:app="http://www.opengis.net/citygml/appearance/2.0" xmlns:gen="http://www.opengis.net/citygml/generics/2.0" xmlns:dem="http://www.opengis.net/citygml/relief/2.0" xmlns:tex="http://www.opengis.net/citygml/texturedsurface/2.0" xmlns:tun="http://www.opengis.net/citygml/tunnel/2.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:sch="http://www.ascc.net/xml/schematron" xmlns:veg="http://www.opengis.net/citygml/vegetation/2.0" xmlns:frn="http://www.opengis.net/citygml/cityfurniture/2.0" xmlns:gml="http://www.opengis.net/gml" xmlns:tran="http://www.opengis.net/citygml/transportation/2.0" xmlns:wtr="http://www.opengis.net/citygml/waterbody/2.0" xmlns:brid="http://www.opengis.net/citygml/bridge/2.0" xsi:schemaLocation="http://www.kantei.go.jp/jp/singi/tiiki/toshisaisei/itoshisaisei/iur/uro/1.4 http://www.kantei.go.jp/jp/singi/tiiki/toshisaisei/itoshisaisei/iur/schemas/uro/1.4/urbanObject.xsd http://www.opengis.net/citygml/2.0 http://schemas.opengis.net/citygml/2.0/cityGMLBase.xsd http://www.opengis.net/citygml/landuse/2.0 http://schemas.opengis.net/citygml/landuse/2.0/landUse.xsd http://www.opengis.net/citygml/building/2.0 http://schemas.opengis.net/citygml/building/2.0/building.xsd http://www.opengis.net/citygml/transportation/2.0 http://schemas.opengis.net/citygml/transportation/2.0/transportation.xsd http://www.opengis.net/citygml/generics/2.0 http://schemas.opengis.net/citygml/generics/2.0/generics.xsd http://www.opengis.net/citygml/cityobjectgroup/2.0 http://schemas.opengis.net/citygml/cityobjectgroup/2.0/cityObjectGroup.xsd http://www.opengis.net/gml http://schemas.opengis.net/gml/3.1.1/base/gml.xsd http://www.opengis.net/citygml/appearance/2.0 http://schemas.opengis.net/citygml/appearance/2.0/appearance.xsd">
<gml:boundedBy>
<gml:Envelope srsName="http://www.opengis.net/def/crs/EPSG/0/6697" srsDimension="3">
<gml:lowerCorner>34.93876102525376 138.77691876113923 100.941</gml:lowerCorner>
<gml:upperCorner>34.940826513994075 138.77930957077407 146.745</gml:upperCorner>
</gml:Envelope>
</gml:boundedBy>
<core:cityObjectMember>
<bldg:Building gml:id="BLD_5b633bbe-eee5-4070-8e1b-202b0c8645da">
<gen:stringAttribute name="建物ID">
<gen:value>22203-bldg-562</gen:value> // this <gen:value>
</gen:stringAttribute>
<gen:genericAttributeSet name="土砂災害警戒區域">
<gen:stringAttribute name="區域區分">
<gen:value>1</gen:value>
</gen:stringAttribute>
<gen:stringAttribute name="現象區分">
<gen:value>2</gen:value>
</gen:stringAttribute>
</gen:genericAttributeSet>
<bldg:class codeSpace="../../codelists/Building_class.xml">3001</bldg:class>
<bldg:measuredHeight uom="m">3.0</bldg:measuredHeight>
<bldg:lod0RoofEdge>
<gml:MultiSurface>
<gml:surfaceMember>
<gml:Polygon>
<gml:exterior>
<gml:LinearRing>
<gml:posList>34.939526582609396 138.77809852668528 126.612 34.93950339425915 138.77803651940917 126.612 34.93947843686556 138.77805028353634 126.612 34.939488015045036 138.77807589974992 126.612 34.93944985234779 138.77809694303997 126.612 34.939448517348794 138.77809335876165 126.612 34.93944036670756 138.77809785248826 126.612 34.93946410156609 138.7781613285196 126.612 34.93948566512662 138.77814943590874 126.612 34.93947687539607 138.7781259461289 126.612 34.939526582609396 138.77809852668528 126.612</gml:posList>
</gml:LinearRing>
</gml:exterior>
</gml:Polygon>
?
?
?
uj5u.com熱心網友回復：
如果要gen在樣式表中使用前綴，則需要將命名空間宣告添加xmlns:gen="http://www.opengis.net/citygml/generics/2.0"到樣式表中。
注意也，xsl:template不允許xsl:with-param孩子。
uj5u.com熱心網友回復：
我在這個 xsl 上取得了成功。
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:core="http://www.opengis.net/citygml/2.0" xmlns:bldg="http://www.opengis.net/citygml/building/2.0" xmlns:gen="http://www.opengis.net/citygml/generics/2.0"
xmlns:gml="http://www.opengis.net/gml" xmlns:str="http://exslt.org/strings" extension-element-prefixes="str">
<xsl:output method="text" indent="no" encoding="UTF-8" />
<xsl:template match="/">
<xsl:apply-templates select="/core:CityModel/core:cityObjectMember/bldg:Building" />
</xsl:template>
<xsl:template match="bldg:Building" />
<xsl:template match="bldg:Building[bldg:lod0FootPrint][bldg:measuredHeight][gen:stringAttribute]">
<xsl:apply-templates select="bldg:lod0FootPrint//gml:Polygon">
<xsl:with-param name="z" select="number(bldg:measuredHeight)" />
<xsl:with-param name="id" select="string(gen:stringAttribute)" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="bldg:Building[bldg:lod0RoofEdge][bldg:measuredHeight][gen:stringAttribute]">
<xsl:apply-templates select="bldg:lod0RoofEdge//gml:Polygon">
<xsl:with-param name="z" select="number(bldg:measuredHeight)" />
<xsl:with-param name="id" select="string(gen:stringAttribute//gen:value)" />
</xsl:apply-templates>
</xsl:template>
<xsl:template match="gml:Polygon">
<xsl:param name="z" />
<xsl:param name="id" />
<xsl:text>{"type":"Feature","properties":{"z":</xsl:text>
<xsl:value-of select="$z" />
<xsl:text>, "buildingId": "</xsl:text>
<xsl:value-of select="$id" />
<xsl:text>"},</xsl:text>
<xsl:text>"geometry":{"type":"Polygon","coordinates":[</xsl:text>
<xsl:for-each select=".//gml:posList">
<xsl:if test="position()!=1">,</xsl:if>
<xsl:text>[</xsl:text>
<xsl:variable name="t" select="str:split(.)" />
<xsl:for-each select="$t[position() mod 3 = 1]">
<xsl:variable name="i" select="position()" />
<xsl:if test="$i != 1">,</xsl:if>
<xsl:value-of select="concat('[',$t[$i*3-1],',',string(.),']')" />
</xsl:for-each>
<xsl:text>]</xsl:text>
</xsl:for-each>
<xsl:text>]}} </xsl:text>
</xsl:template>
</xsl:stylesheet>
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