String key = processVariableElement.getChildText("key", WORKFLOW_NAMESPACE);
List<Element> valueElementList = processVariableElement.getChildren("value", WORKFLOW_NAMESPACE);
if (valueElementList.size() == 1) {
String value = processVariableElement.getChildText("value", WORKFLOW_NAMESPACE);
pv.addValue(value);
} else {
for (Element valueElement : valueElementList) {
String value = valueElement.getText();
pv.addValue(value);
}