Re: top level xsl:param confusion

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Hi Robert,

I think the part of the spec you're looking for is here:
http://www.w3.org/TR/xpath#function-boolean

You pass in an empty Sting that is converted to a boolean using the
boolean() function in xsl:when/@test.

As described in the spec referenced above, boolean("") returns false
(<quote>a string is true if and only if its length is non-zero</>)

thanks,
-Rob

hth,
Wolfgang

Robert Koberg wrote:

| Hi,
|
|
| I have a top level param like so:
|
| <xsl:param name="permission" select="false()"/>
|
|
| Main Question:
|
| Is the above top level xsl:param considered false even if it was passed
| an empty string? I would expect it to be false only if the param was
| *not* passed.
|
|
| More info:
|
| I send the param down to the transformation if a user has access to the
| filesystem otherwise it is not sent. And if they have access I send the
| path that they are restricted to as the value. Some example values are:
|
| "" -- full project access
| "foo" -- access restricted to the 'foo' folder
| "foo/bar" -- access restricted to the 'foo/bar' folder
|
| If they have no restriction I want the param value to be 'false()'
|
| The problem (or my misunderstanding) is when I pass down the empty
| string value - "". So the transformation sees there is a
| /xsl:stylesheet/xsl:param[@name='permission'] - so it should not
| evaluate to false(), right? However, it does in both Xalan and Saxon
| (the only two I tried). I don't see anything in the spec that addresses
| this.
|
| For example, the following chooses the otherwise when the param is sent
| to the transformation as an empty string.
|
| <xsl:choose>
|   <!--<xsl:when test="boolean($permission)"> or -->
|   <xsl:when test="$permission">
| <!-- allow access -->
|   </xsl:when>
|   <xsl:otherwise>
| <!-- no access -->
|   </xsl:otherwise>
| </xsl:choose>
|
| thanks for any clarification,
| -Rob
|
|
|

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