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。
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.
解析器必须同时理解位流的物理格式及其逻辑结构才能创建逻辑消息树。
The parser must understand both the physical format of the bit stream and its logical structure in order to create the logical message tree.
虽然这种解决方案简单明了，但开发人员常常调整解析器和转换逻辑，从而产生出不够灵活的体系结构。
Although this solution is straightforward, developers often choose to tweak the parser and conversion logic, which can lead to an inflexible architecture.
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