xsl-list
[Top] [All Lists]

Re: [xsl] testing for a missing attribute

2010-07-10 21:35:21
At 2010-07-10 19:21 -0700, Dan Vint wrote:
I'm trying to process an XML schema and produce some documentation. I'm trying to trap the various ways min/max occurs can be specified and give the typical option/required/repeating translation. min/maxOccurs are not required values and they default to 1 when not specified. I'm having troubles detecting this situation.

Here is what I've been trying, but it isn't working unless values are specified:

<xsl:choose>
        <xsl:when test="@minOccurs=0 and @maxOccurs=''"> optional

The above won't work because you are testing that the attribute exists and is the empty string. When the attribute doesn't exist, the operand is the empty set. All tests with the empty set as an operand evaluate to false.

        </xsl:when>
        <xsl:when test="@minOccurs=nil and @maxOccurs=nil"> required
        </xsl:when>
        <xsl:when test="@minOccurs=1 and @maxOccurs=1"> required
        </xsl:when>
<xsl:when test="@minOccurs=1 and @maxOccurs='unbounded'"> required repeating
        </xsl:when>
<xsl:when test="@minOccurs='' and @maxOccurs='unbounded'"> required repeating
        </xsl:when>
<xsl:otherwise> min:<xsl:value-of select="@minOccurs"/> max:<xsl:value-of select="@maxOccurs"/>
        </xsl:otherwise>
    </xsl:choose>

How about having:

  <xsl:variable name="minOccurs" select="(@minOccurs,1)[1]"/>
  <xsl:variable name="maxOccurs" select="(@maxOccurs,1)[1]"/>

... and then changing your tests to variables instead of attributes? You won't need the tests for absence since the variable assignment has accommodated absence.

I hope this helps.

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

--
XSLT/XQuery training:   after http://XMLPrague.cz 2011-03-28/04-01
Vote for your XML training:   http://www.CraneSoftwrights.com/s/i/
Crane Softwrights Ltd.          http://www.CraneSoftwrights.com/s/
G. Ken Holman                 mailto:gkholman(_at_)CraneSoftwrights(_dot_)com
Male Cancer Awareness Nov'07  http://www.CraneSoftwrights.com/s/bc
Legal business disclaimers:  http://www.CraneSoftwrights.com/legal


--~------------------------------------------------------------------
XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list
To unsubscribe, go to: http://lists.mulberrytech.com/xsl-list/
or e-mail: <mailto:xsl-list-unsubscribe(_at_)lists(_dot_)mulberrytech(_dot_)com>
--~--

<Prev in Thread] Current Thread [Next in Thread>