4 messages in org.oasis-open.lists.docbook-appsRe: XSLT 'or' statement (Was Re: DOCB...| From | Sent On | Attachments |
|---|---|---|
| Dan York | Jul 31, 2001 10:41 am | |
| Bob Stayton | Jul 31, 2001 12:09 pm | |
| Adam Turoff | Jul 31, 2001 12:20 pm | |
| Dan York | Jul 31, 2001 12:35 pm |
| Subject: | Re: XSLT 'or' statement (Was Re: DOCBOOK-APPS: How can I getstylesheet to bold?) | |
|---|---|---|
| From: | Adam Turoff (zig...@panix.com) | |
| Date: | Jul 31, 2001 12:20:45 pm | |
| List: | org.oasis-open.lists.docbook-apps | |
On Tue, Jul 31, 2001 at 01:39:38PM -0400, Dan York wrote:
<xsl:template match="emphasis"> <xsl:choose> <xsl:when test="@role='bold'|@role='strong'"> <!-- changed line --> <xsl:call-template name="inline.boldseq"/> </xsl:when> <xsl:otherwise> <xsl:call-template name="inline.italicseq"/> </xsl:otherwise> </xsl:choose> </xsl:template>
However, in running it through 'xsltproc' I found that I was getting an error generated. It actually seemed to work correctly, but gave me error messages. I did some research and found that the 'or' functionality of XSLT actually uses the word "or". So the test needs to be:
<xsl:when test="(@role='strong') or (@role='bold')">
Once I changed that, everything worked fine and no errors were produced. One source for this is on the XPath page at:
http://www.w3.org/TR/xpath#booleans
I was a bit surprised as I expected the "|" symbol to work, but it appears that it is at least not "proper" XSLT. (At least that is what I could see in the docs.)
Dan,
The '|' operator creates the union of 2 XPath location paths. The 'or' operator evaluates the boolean or of two XPath predicates. Both predicates and location paths are valid XPath expressions, but they can be used in completely different contexts:
Location paths: section | sect1 | sect2 | sect3 | sect4 | sect5 /book/title | /article/title
Predicates (and similar expressions): @role='bold' or @role='strong' count(ancestor::section) = 0 or @id='1'
The easiest thing to do is to know when you're dealing with a location path, and know when you're dealing with a predicate or other such expression.
Hope this helps,
Z.