liquibase-core/src/main/java/liquibase/parser/core/ParsedNode.java
public Object getChildValue(String namespace, String nodename) throws ParsedNodeException {
        ParsedNode child = getChild(namespace, nodename);
        if (child == null) {
            return null;
        }
        return child.getValue();
    }
public Object getChildValue(String namespace, String nodename) throws ParsedNodeException {
        ParsedNode child = getChild(namespace, nodename);
        if (child == null) {
            return null;
        }
        return child.getValue();
    }
Returns the value of the given node with no conversion attempted.