Re: union and difference
Your definitions for $set1 and $set2: <xsl:variable name="set1" select="set1"/> <xsl:variable name="set2" select="set2"/> will always result in *disjoint* node-sets. $set1 contains the first four <set1> nodes while $set2 contains the first four <set2> nodes. Since a <set1> node is always distinct from a <set2> nodes, these two node-sets will never have any nodes in common. Therefore, when you attempt set intersection with select="$set1[count(.|$set2)=count($set2)]"> you get an empty node-set and when you attempt set difference with select="$set1[count(.|$set2)!=count($set2)]"> you get all four nodes in $set1. The situation is different when you use select="$set1[. = $set2]" select="$set1[not(. = $set2)]" Here you are comparing the *text* values of the nodes in node-sets $set1 and $set2. The first select statement returns the nodes in $set1 (ie <set1> nodes) which have the same text value as nodes in node-set $set2. The second select statement returns the nodes in $set1 which do not have the same text value as nodes in node-set $set2. You might contrast these two select statements with the following: select="$set2[. = $set1]" select="$set2[not(. = $set1)]" These statements while having similar set logic, return nodes in $set2 (ie <set2> nodes) not nodes in $set1 (ie <set1> nodes). Finally, I am not sure I agree with another reply with regard to merging of text nodes. I beleive the following definition of $set1 will in fact have four distinct nodes: <xsl:variable name="set1" select="set1/text()"/> <xsl:value-of select="count($set1)"/> Adjacent text nodes get merged on occassion but perhaps some could clarify precisely when this happens as I am not 100% certain. Regards, Dan __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
PURCHASE STYLUS STUDIO ONLINE TODAY!
Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!
Download The World's Best XML IDE!
Accelerate XML development with our award-winning XML IDE - Download a free trial today!
Subscribe in XML format