# Re: Using "except" where some nodes are copies (not th

 Subject: Re: Using "except" where some nodes are copies (not the original)? From: Dimitre Novatchev Date: Wed, 28 Dec 2011 17:02:24 -0800
```Anyway, I think that mixing together two kind of identities (node
identity and value identity) is not a safe practice.

My first answer uses value-identity entirely.

On Wed, Dec 28, 2011 at 4:59 PM, Dimitre Novatchev <dnovatchev@xxxxxxxxx>
wrote:
> Perhaps:
>
> (A, B, C)
> B  B  B  B [for \$n in .
> B  B  B  B  B  return
> B  B  B  B  B  B  B not( (\$B, C)
> B  B  B  B  B  B  B  B  B  B  B  B  [deep-equal(., \$n)]
> B  B  B  B  B  B  B  B  B  B )
> B  B  B  B  ]
>
>
>
>
> On Wed, Dec 28, 2011 at 3:17 PM, Costello, Roger L. <costello@xxxxxxxxx>
wrote:
>> Hi Folks,
>>
>> How do I do set subtraction where some of the nodes in the two sets may be
copies (not originals)?
>>
>> Please allow me to explain.
>>
>> Consider this XML document:
>>
>> <Test>
>> B  B <A/>
>> B  B <B/>
>> B  B <C/>
>> </Test>
>>
>> Set <Test> as the context node.
>>
>> This operation:
>>
>> B  B (A, B,, C) except (B, C)
>>
>> returns:
>>
>> B  B (A)
>>
>> Nice.
>>
>> Now, make a copy of B and store it into a variable:
>>
>> B  B  B <xsl:variable name="B" as="element(B)">
>> B  B  B  B  B  B  B  B <xsl:copy-of select="B" />
>> B  B  B  </xsl:variable>
>>
>> Run the same operation, but using the variable:
>>
>> B  B (A, B, C) except (\$B, C)
>>
>> Returns:
>>
>> B  B (A, B)
>>
>> Ouch!
>>
>> B I don't want that behavior. I want:
>>
>> B  B (A, B, C) except (\$B, C)
>>
>> to return:
>>
>> B  B (A)
>>
>> How do I achieve the behavior I desire?
>>
>> That is, how do I do set subtraction where some of the nodes in the two
sets may be copies?
>>
>> /Roger
>>
>
>
>
> --
> Cheers,
> Dimitre Novatchev
> ---------------------------------------
> Truly great madness cannot be achieved without significant intelligence.
> ---------------------------------------
> To invent, you need a good imagination and a pile of junk
> -------------------------------------
> Never fight an inanimate object
> -------------------------------------
> To avoid situations in which you might make mistakes may be the
> biggest mistake of all
> ------------------------------------
> Quality means doing it right when no one is looking.
> -------------------------------------
> You've achieved success in your field when you don't know whether what
> you're doing is work or play
> -------------------------------------
> Facts do not cease to exist because they are ignored.
> -------------------------------------
> I finally figured out the only reason to be alive is to enjoy it.

--
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
To avoid situations in which you might make mistakes may be the
biggest mistake of all
------------------------------------
Quality means doing it right when no one is looking.
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.

```

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