XPath：如何选择具有一个或另一个属性的所有元素

Question

I've been searching everywhere for this and can't find a solution to my problem. I'm trying to find an XPath expression that will select all elements with an attribute named "user" or "product" (or both). I know the XPath expression for one attribute would be :

//*[@user]

or

//*[@product]

And these both work fine, they grab all elements with the proper attribute anywhere inside the document. But whenever I try to combine them :

//*[@user|@product]

or

//*[@user]|//*[@product]

I only get the elements found in the first level where these attributes are found. Here's an example of my XML document :

<?xml version="1.0" encoding="ISO-8859-1" ?>
<?xml-stylesheet href="xslt.xml" type="application/xml"?>
<catalog>
<item user="me" product="coffee" />
<price product="expensive" quality="good">$19.50</price>
<item user="still me"><note product="poison">Do not eat.</note></item>
<price product="mystery"><exchange user="still me" product="euro" />$99.95</price>
</catalog>

Now with this XSLT transformation :

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="//*[@user|@product]">
<xsl:copy />
</xsl:template>
</xsl:stylesheet>

I only get these elements :

<item/>
<price/>
<item/>
<price/>

But what I really want is this :

<item/>
<price/>
<item/>
<note/>
<price/>
<exchange/>

Of course, as you might have guessed already, when I put the "user" attribute in my catalog element, all that's selected is the catalog element, no children.

I've been trying for hours and can't find the solution. If anyone knows how to fix this, please let me know.

Answer 1

Use or instead of | . | is a different operator which I frankly do not know the meaning of :-)

Answer 2

Though the answer provided by Jiří Kantor is right, you would have to use the following XSLT to get the desired result:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">
    <xsl:apply-templates select="//*[@user or @product]"/>
</xsl:template>

<xsl:template match="*">
    <xsl:copy/>
</xsl:template>

</xsl:stylesheet>