You can validate an XML document on demand or automatically when you save the document.
可以在需要时验证XML文档，或在保存文档时自动验证。
The On Demand mode exports a document immediately, while scheduled mode adds the document to a scheduled queue to be processed later.
On Demand模式立即导出文档，而Scheduled模式则将文档添加到计划队列中，留待以后处理。
Since a parser delivers data in document order (the same order items appear in the XML document text), the on-demand construction implemented by AXIOM requires some clever handling.
因为解析器按照文档顺序(与XML文档文本中项目的出现顺序相同)传递数据，所以AXIOM所实现的按需构造需要某种灵活的处理方法。
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