Re: Help getting the difference of two attribute lists

[email protected] wrote:

> I have two lists of attributes ($attr1, $attr2). I want to make a list
> ($attr3) that will be everything found in $attr1 and NOT in $attr2.
> example:
> 
> doc1.xml:
> 
> <attr1 a=5 b=6 c=7/>
> <attr2 c=7 b=6/>

Where are the quotes around the attribute values?

> Running this code:
> 
> <xsl:variable name="attr1" select="attr1\@*"/>

    att1/@*

> <xsl:variable name="attr2" select="attr2\@*"/>

    att1/@*

> Returns this:
> 
> $attr1[0] = 'a' 5

No, the index in XPath node sets starts with 1 not with 0.

> $attr1[1] = 'b' 6
> $attr1[2] = 'c' 7
> 
> $attr2[0] = 'c' 7 // Notice that its not ordered
> $attr2[1] = 'b' 6
> 
> What I would like to get in attr3 is this:
> 
> $attr3[0] = 'a' 5 <- in attr1 and NOT in attr2

If you only want to compare by attribute values then e.g.

   <xsl:variable name="attr1" select="attr1/@*"/>
   <xsl:variable name="attr2" select="attr2/@*"/>
   <xsl:variable name="attr3" select="$attr1[not(. = $attr2)]"/>

suffices. If you want to compare attribute names and values then I don't 
think that a single expression suffices with XPath 1.0, you will need to 
write a template in XSLT.


-- 

	Martin Honnen
	http://JavaScript.FAQTs.com/