This is in contrast to previous RDBs, which usually stored XML data by fitting it into a specified table structure, and simply handling the data as a large character string.
A black hat is the villain or bad guy, especially in a western movie in which such a character would wear a black hat in contrast to the hero's white hat.
“黑帽”指恶棍或坏蛋，尤其在西部片里，他们一般都戴着一顶黑帽子，而跟他们对手的正面角色多戴白帽子。
3
In contrast to Sherlock Holmes, the ultimate detective, Lupin was an extreme version of the gentleman criminal, a popular character in fiction and film throughout the 20th century.