Only after syntax checking is passed, can an XML document be confirmed as well formed and can the logical structure of the document be parsed.
只有语法检查通过之后，才能确认XML文档格式良好并可以解析文档的逻辑结构。
2
The first part handles the checking in and checking out of a logical attachment using the claim check service, while the second part performs the same function for a physical attachment.
This checking module can correctly find syntax errors and some simple logical errors of the diagram program, which provides guidance for the further development.