Q1:	By which language should the stylesheet be written for the use of DSSSLprint, NEXTPublisher, and NEXTStylus?

The applicable stylesheet should be written by the International Standard DSSSL(Document Style and Semantic Specification Language ISO/IEC10179:1996)

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Q2:	Is DSSSL stylesheet for XML document just the same with DSSSL stylesheet for SGML document?

You can use the same stylesheet for XML or SGML document. as far as the structure of DTD(Document Type Definition) for XML document is identical to that of DTD for SGML document.
We would recommend you to use our NEXTStylus as a tool to write DSSSL stylesheet with remarkable ease which supports the basic part to create stylesheet. Complex designations are to be supplemented by text editor or so.
Evaluation version can be downloaded now by you from our home page. Please try it.

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Q3:	You said that the document file to use DSSSLprint, NEXTPublisher and NEXTStylus should be SGML/XML. Is there any limitation in case of XML document, then? What sort of limitation is it if any?

There is no limitation at all, except that it is imperative to define DTD(Document Type Definition)correctly.

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Q4:	Which language should we use to write a stylesheet in case of using XFor?

The stylesheet for XFor should be written by XSL-FO(XSL Formatting Object)which was recommended by W3C Oct.15,2001.