Re: [xsl] shortest way to write this xsl:if statement

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2012-06-15 12:54 +0100, henry human wrote:
> Hello
> The following if statement is too long if try it as in the sample bellow.
> How could be shorter?
> The if - logic to create a for-each loop:
> ----------------
> xsl:if
> D4/G100/6id  or D4/G100/9id or D4/G100/12id or D4/G100/6id15 or 
> D4/G100/45id or D4/G100/22id, D4/G100/10id
> or D4/G100/19id is 'A' or 'B' or 'C', or 'D' or 'F'
>
> The Sample:
> <xsl:if test="D4/G100/6id = 'A' OR test="D4/G100/6id = 'B' OR 
> test="D4/G100/6id = 'C' OR test="D4/G100/9id = 'A' OR 
> test="D4/G100/9id = 'B' .....>
>
> <xsl:for-each select=" ......">
> ...
> </xsl:for-each>
>
> </xsl:if>

Element names cannot begin with digits, so I'm unclear how you are 
going to be testing elements such as <6id>.

But, assuming you had elements D4/G100/X and D4/G100/Y and D4/G100/Z, 
you could have in XSLT2 the following:

<xsl:if test="D4/G100/(X,Y,Z) = ('A','B','C')">

... which is equivalent to:

  D4/G100/X = 'A' or
  D4/G100/X = 'B' or
  D4/G100/X = 'C' or
  D4/G100/Y = 'A' or
  D4/G100/Y = 'B' or
  D4/G100/Y = 'C' or
  D4/G100/Z = 'A' or
  D4/G100/Z = 'B' or
  D4/G100/Z = 'C'

When using the "=" comparison operator, either operand can be a 
set.  The processor walks through the comparisons in an arbitrary 
order eventually testing each of the left operand with each of the 
right operand and stops when it hits a true() result and returns 
true().  If you get a false() returned, you know the processor has 
checked every possible combination and every combination has returned false().

I hope this helps.

. . . . . . . . . . . Ken

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