Overview of C20 ~~~~~~~~~~~~~~~ In this paper, Japan shows our position to support the Russian proposal by D.40 regarding introduction of XML into ITU-T documents. The Russian proposal D.40 is a natural and practical requirement for today's document processing. Similar requirements are being satisfied in several standardization organizations, e.g., JTC1, W3C, etc. An XML (extensible markup language) is developed by W3C as an extension to SGML (ISO 8879). Today, XML is approved by ISO as TC2(Technical Corrigendum 2) to ISO 8879. The benefits of XML have been clarified by the former document D.40. I believe the major benefit of XML is that it is open and independent from particular commercial products. And besides, a number of XML products are freely available. Of course, major software companies, e.g., Microsoft, Adobe, Sun-micro, IBM, etc., have supported XML features in their products. TD 355 proposes some improvements to the template. It will create a better background for preparing the introduction of XML. Therefore we can support TD 355 as well as D.40, and propose to invite much more contributions regarding introduction of XML as shown in the last paragraph of our document C20. At last I wish to emphasize the three issues: - XML is an interchange format and not a system specification. - users of XML, e.g. author of recommendations, don't have to see an XML coding and don't have to study XML itself, and - well designed XML authoring system can provide the same authoring environment as that you are used to use today and may provide some additional convenient functionality. In accordance with my experience in ISO, some ITU-T authors will in future actually use XML tools, and provide or circulate their XML documents. In those cases, the structures of their XML documents will be different from each other and will cause some confusion and incompatibility. So I would like to strongly suggest you begin the technical discussion of a standardized XML structure of recommendation documents. The structure should be described by DTD or schema languages, e.g. RELAX NG, ISO/IEC 19757-2.