[j-nsp] set:difference() function in SLAX returns different results while input node-sets are the same

[Martin T]

Hi Phil,

> Two issues: first is that it is really comparing nodes not contents

Yes, that I understand. For example, here both element nodes contain
the same text node, but set:difference() still returns a node-set
<vlan><id id="100">99</id></vlan>:

$ cat foo.slax
version  1.2;

var $v1 := {
    <vlan> {
        <id id="99"> "99";
    }
    <vlan> {
        <id id="100"> "99";
    }
}

var $v2 := $v1/*[1];

main <top> {
    <diff> {
        copy-of set:difference($v1/*, $v2);
    }
}
$ slaxproc -g -E foo.slax
<?xml version="1.0"?>
<top>
  <diff>
    <vlan>
      <id id="100">99</id>
    </vlan>
  </diff>
</top>
$


What I quite don't understand is why set:difference() considers $v1/*
and $v2/* to be different:

$ cat foo.slax
version  1.2;

var $v1 := {
    <vlan> {
        <id> "99";
    }
    <vlan> {
        <id> "99";
    }
}

var $v2 := {
    <vlan> {
        <id> "99";
    }
    <vlan> {
        <id> "99";
    }
}

main <top> {
    <diff> {
        copy-of set:difference($v1/*, $v2/*);
    }
}
$ slaxproc -g -E foo.slax
<?xml version="1.0"?>
<top>
  <diff>
    <vlan>
      <id>99</id>
    </vlan>
    <vlan>
      <id>99</id>
    </vlan>
  </diff>
</top>
$

When I execute "print $v1/*" and "print $v2/*" in the debugger, then
the output is identical.


thanks,
Martin