In practice, parsing twice does not cause much trouble because the processing instructions must appear in the prologue of the document, so XM reparses only a small subset of the document.
实际上，解析两次不会引起更多麻烦，因为处理指令必须出现在文档开始，所以XM 只是重新解析文档的一小部分。
In practice, parsing twice does not cause much trouble because the processing instructions must appear in the prologue of the document, so XM reparses only a small subset of the document.
实际上，解析两次不会引起更多麻烦，因为处理指令必须出现在文档开始，所以XM 只是重新解析文档的一小部分。
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