We now add custom fields to the documents that describe the books by attaching the property sheet type to the book document.

现在，我们向文档添加定制字段。这些定制字段通过向图书文档添加属性表类型来描述图书。

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After the property sheet type is created, we must add it to a document type, so that we can use this property sheet type as custom fields in a document.

在创建了属性表类型之后，我们必须将它添加到文档类型，这样才能在文档中将该属性表类型用作定制字段。

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After generating the QDML file from a DTD grammar I had to edit the file to define the document root element and add type information for non-String values (a couple of ints, in this case).

根据DTD文法生成QDML文件之后，必须编辑该文件来定义文档的根元素，并为非string值(在这里，是几个int)添加类型信息。

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