XSLT Ternary "If" Operator?

Question

I am making use of XSLT and XML to produce an output document.

What I have in the data (in XML form over which I have no control) is the following:

<ea type="null"/>
<pa type="null"/>
<perf>4</perf>

I need to use these in calculations. I see that providing a default value for these requires performing a transformation on the document to provide a default value which is a bit long winded.

So I thought, does there exist a ternary operation in XPath/XSLT, along the lines of PHP:

$result = ($var == null ? true:false)

So that the following provides a result (even if it is zero)

<xsl:value-of select="ea + pa + perf" />

Answer 1

XPath does not support a conditional expression operator. It does, however, support if/then/else syntax if you happen to have an XSLT 2.0 processor. (Note that most XSLT processors do not support this)