如何使用xslt合并两个xml文件以生成文本输出

Question

I already saw variants of my problem under how-to-merge-two-xml-files-with-xslt or how-can-i-merge-these-two-xml-files-using-xslt , but these examples do not handle the text-output and also not handle a static refernece to'default.xml'.

I am trying to generate a C headerfile beeing generated from a defaults.xml that gets amended by an target.xml.

I am using xsltproc as xslt processor and would like to be able to do xslproc merg.xsl target1.xml > target1.h .

Meaning to have one defaults.xml file and different target.xml files

example defaults.xml:

 <?xml version="1.0" encoding="UTF-8"?> <defaults> <ConfigParam name="F_SAMPLE_STRING"> <value>{1,0,0}</value> </ConfigParam> <ConfigParam name="F_SAMPLE_INT"> <value>40</value> </ConfigParam> <ConfigParam name="F_SAMPLE_X"> <value>TRUE_DEF</value> </ConfigParam> </defaults> 

and a sample target1.xml

 <?xml version="1.0" encoding="UTF-8"?> <Override> <ConfigParam name="F_SAMPLE_STRING"> <value>"hallo"</value> </ConfigParam> <ConfigParam name="F_SAMPLE_Y"> <value>TRUE</value> </ConfigParam> </Override> 

My own starting xslt looks like this, but does lack the merging/amendment part

 <?xml version="1.0"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:output method="text"/> <xsl:param name="fileName" select=" 'defaults.xml' " /> <xsl:param name="defaults" select="document($fileName)" /> <xsl:variable name="defaultParams" select="$defaults//ConfigParam" /> <xsl:template match="@* | node() "> <xsl:copy> <xsl:apply-templates select="@* | node()"/> </xsl:copy> </xsl:template> <xsl:template match="ConfigParam"> #define <xsl:value-of select="@name"/><xsl:text> </xsl:text><xsl:value-of select="value"/> <xsl:text>&#xd;&#xa;</xsl:text> </xsl:template> </xsl:stylesheet> 

The other examples I saw use a static target.xml or use both files (target/defaults) from static locations. They also do not output text but xml. I am new to xslt and can not come up with a good merging identity pattern. Please help.

Answer 1

If I understand correctly, you want to do:

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="text"/> 
<xsl:strip-space elements="*"/>

<xsl:param name="path-to-defaults" select="'defaults.xml'" />
<xsl:variable name="defaults" select="document($path-to-defaults)/defaults/ConfigParam" />
<xsl:variable name="overrides" select="/Override/ConfigParam" />

<xsl:template match="/">
    <xsl:apply-templates select="$defaults[not(@name = $overrides/@name)]" />
    <xsl:apply-templates select="$overrides" />
</xsl:template>     

<xsl:template match="ConfigParam">
    <xsl:text>#define </xsl:text>
    <xsl:value-of select="@name"/>
    <xsl:text> </xsl:text>
    <xsl:value-of select="value"/>
    <xsl:text>&#xd;&#xa;</xsl:text> 
</xsl:template>  

</xsl:stylesheet>

This assumes you will be processing the target1.xml file and pointing to a constant defaults.xml file. The result here is:

#define F_SAMPLE_INT 40
#define F_SAMPLE_X TRUE_DEF
#define F_SAMPLE_STRING "hallo"
#define F_SAMPLE_Y TRUE

Note: with a text output, you don't want to use the identity transform template.