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Subject: RNG schemas for UBL
Hello UBL TC, When we started UBL in OASIS two years ago, we inherited from the ad hoc UBL planning group a very early NDR decision to avoid the use of XSD features that would prevent the realization of UBL in other schema syntaxes, in particular Relax NG, which is an ISO standard that many people prefer to XSD. Relax NG compatibility was dropped as a formal NDR requirement some time ago, but it remains a desirable goal. The IEC ISO ITU UN/ECE eBusiness MoU Management Group, which has maintained UBL on its continuing agenda for two years now, is on record with the following recommendations: 02/07 (6.4 of N0113): It is recommended that RELAX NG, ASN.1, and XSD be considered as important and to some extent complementary candidates for XML schema definitions. 02/08 (6.4 of N0113): It is recommended that groups producing XML schemas for Ebusiness should consider parallel specification using at least two of the above in order to maximize the tools available to developers, and in order to benefit from efficient binary encoding (currently available only in ASN.1). I was happy to be able to report to the MoU/MG at its meeting near Detroit 24-25 November that UBL has included an ASN.1 binding since version 0.7 and that a team has been formed under the direction of Professor Naito at the Osaka Institute of Technology to create Relax NG equivalents of the UBL 1.0 XSD schemas. Professor Naito has just reported the results of early work by his team in the message to the UBL LCSC and TTSC below. I am copying it to the UBL list in an attempt to stop cross-posting between SCs, a subject that will be taken up in tomorrow's coordination call, and in order to put Naito-san's work in front of a wider audience that includes some Relax NG experts so that they can evaluate his approach. Since we have no SC devoted to Relax NG practices for UBL, and since Relax NG alignment is not a formal requirement for UBL, I suggest that people interested in the subject forward this message to other interested parties and correspond with Professor Naito directly for the moment regarding the questions raised in his message. In the future, I hope that Professor Naito will continue to update us on his progress by posting to the public ubl-dev list that will be announced shortly so that this important project receives the widest possible exposure. Jon ================================================================== Date: Thu, 04 Dec 2003 17:19:46 +0900 To: firstname.lastname@example.org, email@example.com From: Hiroshi Naito <firstname.lastname@example.org> Hi, We describe some UBL schema using Relax NG which are manually translated from W3c XML schema of UBL-1.0-beta. The attached zip includes files following: UBL-CodeList-CountrySubentityCod -1.0-beta.xsd UBL-CodeList-CountrySubentityCode-1.0-beta.rng UBL-CoreComponentParameters-1.0-beta.rng UBL-CoreComponentParameters-1.0-beta.xsd UBL-CoreComponentTypes-1.0-beta.rng UBL-CoreComponentTypes-1.0-beta.xsd UBL-DataTypes-1.0-beta.rng UBL-DataTypes-1.0-beta.xsd UBL-RepresentationTerms-1.0-beta(CodeType).rng UBL-RepresentationTerms-1.0-beta(CodeType).xsd UBL-RepresentationTerms-1.0-beta(IndicatorType).rng UBL-RepresentationTerms-1.0-beta(IndicatorType).xsd Files with .rng extension are Relax NG schema corresponding to W3C XML schema file with .xsd extension. For showing what must be generated by translating tool, only one element and type is included in each schema files. When we study the difference of the power between XML Schema and Relax NG, the following XML Schema definition is not translated to Relax NG. UBL-RepresentationTerms-1.0-beta(IndicatorType).xsd <xsd:simpleType name="IndicatorType"> <xsd:restriction base="cct:IndicatorType"> <xsd:pattern value="false"/> <xsd:pattern value="true"/> </xsd:restriction> </xsd:simpleType> The definition of IndicatorType in Relax NG cannot be restricted values of pattern such as following. UBL-RepresentationTerms-1.0-beta(IndicatorType).rng <define name="IndicatorType"> <ref name="IndicatorType" ns="urn:oasis:names:tc:ubl:CoreComponentParameters:1:0-beta" /> </define> We will translate restriction pattern of XML schema to comment text in Relax NG. We hope suggestion and advice for Relax NG schema. Thanks Naito
----- Hiroshi Naito, Assistant Professor, Osaka Institute of Technology <http://www.oit.ac.jp/> 1-79-1, Kitayama, Hirakata-City, Osaka, 573-0196, Japan TEL: +81-72-866-5194 FAX: +81-72-866-8499, E-Mail: email@example.com
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