Dynamic XPath and Interpolators

• ls .//article[@pubyear > 1999];

• Can we create XPath dynamically in XSH?

• $filter = “@pubyear > 1999”; # Think: $filter=$ARGV[1]

• ls .//*[xsh:evaluate($filter,.)]; # as EXSLT dyn:evaluate

• ls .//*[${filter}]; # Interpolator

• Other interpolators (ls //scratch):

• ls //${{ join 'c',qw(s rat h) }}; # Interpolate a Perl code

• ls //${(concat("scra","tch"))}; # Interpolate XPath

• ls //${(name(//scratch))}; # Huh?