Shared variable space

• $c = string((//chapter)[1]/title); # a string

• $x = count(//chapter[title=$c]); # a number

• echo {“Found $x chapter”.(“s” x ($x!=1)).” named '$c'”};

• Prints e.g.: Found 2 chapters named 'Introduction'

• $titles = //chapter/title; # a node set

• ls $titles[starts-with(.,”O”)];

• echo { join “, “ @$titles };

• Prints e.g.: Introduction, Terminology, What's XML, ...