Conditions
To make choices based on conditions in BPEL 2.0, we use the <if> activity to define the conditional branches, which replaced the <switch> activity in BPEL 1.1. The <if> activity can have several <elseif> branches and one <else> branch. The following example shows the structure of the <if> activity:
<if>
<condition>boolean-expression</condition>
<!--activities -->
<elseif>
<condition>boolean-expression</condition>
<!--activities -->
</elseif>
<elseif>
<condition>boolean-expression</condition>
<!--activities -->
</elseif>
...
<else>
<!--activities -->
</else>
</if>The Boolean expressions for the <condition> elements are expressed in the XPath. We can use any valid XPath expression that returns a Boolean value. To use variables in conditions, we can use the $ operator, the same way as in assignments...
