For an XML data source, each time you need data from the XML, VVM has to fetch the XML from its source, load it in memory, parse it, and then transform it into relational format.

对于XML数据源，每次需要XML数据时，VVM需要从源获取数据，加载到内存中，解析，然后转换成关系格式。

youdao

For an XML data source, each time you need data from the XML, VVM has to fetch the XML from its source, load it in memory, parse it, and then transform it into relational format.

对于XML数据源，每次需要XML数据时，VVM需要从源获取数据，加载到内存中，解析，然后转换成关系格式。

youdao