liquibase-core/src/main/java/liquibase/parser/core/ParsedNode.java
public <T> T getChildValue(String namespace, String nodename, Class<T> type) throws ParsedNodeException {
        Object rawValue = getChildValue(namespace, nodename);
        if (rawValue == null) {
            return null;
        }
        return convertObject(rawValue, type);
    }
public <T> T getChildValue(String namespace, String nodename, Class<T> type) throws ParsedNodeException {
        Object rawValue = getChildValue(namespace, nodename);
        if (rawValue == null) {
            return null;
        }
        return convertObject(rawValue, type);
    }
Returns the value of the given node, converted to the passed type.
@throws liquibase.parser.core.ParsedNodeException if there is an error converting the value