问题
I'm using XSLT to extract some data from a trademark XML file from the Patent and Trademark Office. It's mostly okay, except for one blank line. I can get rid of it with a moderately ugly workaround, but I'd like to know if there a better way.
Here's a subset of my XSLT:
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:tm="http://www.wipo.int/standards/XMLSchema/trademarks" xmlns:pto="urn:us:gov:doc:uspto:trademark:status">
<xsl:output method="text" encoding="utf-8" />
<xsl:strip-space elements="*"/>
<xsl:template match="tm:Transaction">
<xsl:apply-templates select=".//tm:TradeMark"/>
<xsl:apply-templates select=".//tm:ApplicantDetails"/>
<xsl:apply-templates select=".//tm:MarkEvent"/>
</xsl:template>
<xsl:template match="tm:TradeMark">
MarkCurrentStatusDate,"<xsl:value-of select="normalize-space(tm:MarkCurrentStatusDate)"/>"<xsl:text/>
ApplicationNumber,"<xsl:value-of select="normalize-space(tm:ApplicationNumber)"/>"<xsl:text/>
ApplicationDate,"<xsl:value-of select="normalize-space(tm:ApplicationDate)"/>"<xsl:text/>
RegistrationNumber,"<xsl:value-of select="normalize-space(tm:RegistrationNumber)"/>"<xsl:text/>
RegistrationDate,"<xsl:value-of select="normalize-space(tm:RegistrationDate)"/>"<xsl:text/>
<xsl:apply-templates select="tm:WordMarkSpecification"/>
<xsl:apply-templates select="tm:TradeMarkExt"/>
<xsl:apply-templates select="tm:PublicationDetails"/>
<xsl:apply-templates select="tm:RepresentativeDetails"/>
</xsl:template>
<xsl:template match="tm:WordMarkSpecification">
MarkVerbalElementText,"<xsl:value-of select="normalize-space(tm:MarkVerbalElementText)"/>"<xsl:text/>
</xsl:template>
It has a few more templates, but that's the gist of it. I always get a blank line at the very beginning of the output, before any data; I don't get any other blank lines. My circumvention is to combine the two lines:
<xsl:template match="tm:TradeMark">
MarkCurrentStatusDate,"<xsl:value-of select="normalize-space(tm:MarkCurrentStatusDate)"/>"<xsl:text/>
into a single line:
<xsl:template match="tm:TradeMark">MarkCurrentStatusDate,"<xsl:value-of select="normalize-space(tm:MarkCurrentStatusDate)"/>"<xsl:text/>
This works, and I guess I'm okay with it if there's nothing better, but it seems inelegant and like a kludge to me. None of the other templates need this treatment (e.g. the tm:WordMarkSpecification template or another six after that)), and I'm confused why it's needed here. Any ideas?
Because I can see the specific point in the XSLT that's inserting the blank line, I presume it's not helpful to provide the XML I'm testing on, but if you do need to see it, you can get it at https://tsdrapi.uspto.gov/ts/cd/casestatus/rn2178784/download.zip ; it's the XML file in that archive.
回答1:
Use at the beginning of the template the same trick you are using at the end of the template to chop up the stylesheet node tree with empty <xsl:text/> instructions:
<xsl:template match="tm:TradeMark">
<xsl:text/>MarkCurrentStatusDate,"<xsl:value-of select="normalize-space(tm:MarkCurrentStatusDate)"/>"<xsl:text/>
回答2:
Personally, I think it's cleaner to use a concat() when you need to combine static text and dynamic values:
<xsl:template match="tm:TradeMark">
<xsl:value-of
select="concat(
'MarkCurrentStatusDate,"', normalize-space(tm:MarkCurrentStatusDate), '"',
'ApplicationNumber,"', normalize-space(tm:ApplicationNumber), '"',
'ApplicationDate,"', normalize-space(tm:ApplicationDate), '"',
'RegistrationNumber,"', normalize-space(tm:RegistrationNumber), '"',
'RegistrationDate,"', normalize-space(tm:RegistrationDate), '"'
)"/>
<xsl:apply-templates select="tm:WordMarkSpecification"/>
<xsl:apply-templates select="tm:TradeMarkExt"/>
<xsl:apply-templates select="tm:PublicationDetails"/>
<xsl:apply-templates select="tm:RepresentativeDetails"/>
</xsl:template>
This should also solve your issue with the blank spaces showing up.
回答3:
Remember you can always just play with the XML syntax to ignore end-of-line sequences that are inside of start and end tag delimiters:
<xsl:template match="tm:TradeMark"
>MarkCurrentStatusDate,"<xsl:value-of select="normalize-space(tm:MarkCurrentStatusDate)"
/>"ApplicationNumber,"<xsl:value-of select="normalize-space(tm:ApplicationNumber)"
/>"ApplicationDate,"<xsl:value-of select="normalize-space(tm:ApplicationDate)"
/>"RegistrationNumber,"<xsl:value-of select="normalize-space(tm:RegistrationNumber)"
/>"RegistrationDate,"<xsl:value-of select="normalize-space(tm:RegistrationDate)"
/>"<xsl:apply-templates select="tm:WordMarkSpecification"/>
<xsl:apply-templates select="tm:TradeMarkExt"/>
<xsl:apply-templates select="tm:PublicationDetails"/>
<xsl:apply-templates select="tm:RepresentativeDetails"/>
</xsl:template>
There is no rule in XML that a tag's closing delimiter /> has to be on the same line as the tag's opening delimiter <. White-space inside of a tag is ignored (where innocuous), and an end-of-line sequence is considered white-space.
回答4:
If you want all of the text to be emitted without extra line breaks or white-space, then put the literal text inside of <xsl:text> elements.
<xsl:template match="tm:TradeMark">
<xsl:text>MarkCurrentStatusDate,"</xsl:text>
<xsl:value-of select="normalize-space(tm:MarkCurrentStatusDate)"/>
<xsl:text>"</xsl:text>
<xsl:text>ApplicationNumber,"</xsl:text>
<xsl:value-of select="normalize-space(tm:ApplicationNumber)"/>
<xsl:text>"</xsl:text>
<xsl:text>ApplicationDate,"</xsl:text>
<xsl:value-of select="normalize-space(tm:ApplicationDate)"/>
<xsl:text>"</xsl:text>
<xsl:text>RegistrationNumber,"</xsl:text>
<xsl:value-of select="normalize-space(tm:RegistrationNumber)"/>
<xsl:text>"</xsl:text>
<xsl:text>RegistrationDate,"</xsl:text>
<xsl:value-of select="normalize-space(tm:RegistrationDate)"/>
<xsl:text>"</xsl:text>
<xsl:apply-templates select="tm:WordMarkSpecification"/>
<xsl:apply-templates select="tm:TradeMarkExt"/>
<xsl:apply-templates select="tm:PublicationDetails"/>
<xsl:apply-templates select="tm:RepresentativeDetails"/>
</xsl:template>
That way, none of the line breaks and white-space inside of the <xsl:template> will be seen as significant and will not be included in the result tree output.
来源：https://stackoverflow.com/questions/17823425/one-pesky-blank-line-in-an-xslt-transform