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从多文件RelaxNG模式生成DTD

relaxng file-conversion dtd xml

David Eyk · 技术社区 · 11 年前

我有一个RelaxNG模式,分为几个 .rnc 文件夹。我希望能够将它们转换为DTD,但是 trang 抱怨我使用 external 指令:

$ trang schema/text.rnc schema/text.dtd
[...]/schema/text.rnc:3:6: error: sorry, "externalRef" is not supported
[...]/schema/text.rnc:4:9: error: sorry, "externalRef" is not supported
[...]/grcxml/schema/text.rnc:6:15: error: sorry, "externalRef" is not supported
[...]/schema/text.rnc:3:6: error: sorry, "externalRef" is not supported
Exception in thread "main" java.lang.NullPointerException
        at com.thaiopensource.relaxng.output.dtd.ContentType.ref(ContentType.java:138)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitRef(Analysis.java:232)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitRef(Analysis.java:78)
        at com.thaiopensource.relaxng.edit.RefPattern.accept(RefPattern.java:9)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.analyzeContentType(Analysis.java:336)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitGroup(Analysis.java:216)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitGroup(Analysis.java:78)
        at com.thaiopensource.relaxng.edit.GroupPattern.accept(GroupPattern.java:5)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.analyzeContentType(Analysis.java:336)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitElement(Analysis.java:118)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitElement(Analysis.java:78)
        at com.thaiopensource.relaxng.edit.ElementPattern.accept(ElementPattern.java:9)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.analyzeContentType(Analysis.java:336)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitRef(Analysis.java:232)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitRef(Analysis.java:78)
        at com.thaiopensource.relaxng.edit.RefPattern.accept(RefPattern.java:9)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.analyzeContentType(Analysis.java:336)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitDefine(Analysis.java:288)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitDefine(Analysis.java:78)
        at com.thaiopensource.relaxng.edit.DefineComponent.accept(DefineComponent.java:39)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitContainer(Analysis.java:278)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitGrammar(Analysis.java:258)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.visitGrammar(Analysis.java:78)
        at com.thaiopensource.relaxng.edit.GrammarPattern.accept(GrammarPattern.java:14)
        at com.thaiopensource.relaxng.output.dtd.Analysis$Analyzer.analyzeContentType(Analysis.java:336)
        at com.thaiopensource.relaxng.output.dtd.Analysis.<init>(Analysis.java:534)
        at com.thaiopensource.relaxng.output.dtd.DtdOutputFormat.output(DtdOutputFormat.java:22)
        at com.thaiopensource.relaxng.translate.Driver.run(Driver.java:144)
        at com.thaiopensource.relaxng.translate.Driver.main(Driver.java:44)

Trang将RelaxNG这样的表达模式填充到一个昏暗的DTD中的能力似乎足够神奇,这一障碍令我惊讶。 外部的 includes非常适合在模式间共享定义,我不想失去它们。那么,实现这一目标的最佳方式是什么?

2 回复 | 直到 11 年前

Louis 11 年前

如果您不在乎DTD不会将分区复制到源文件中,那么可以使用 jing 第一:

$ jing -s source.rng > intermediate.rng
$ trang intermediate.rng final.dtd

第一步将所有内容合并到一个文件中。第二个将转换。

Rintze Zelle Wilfred Springer 11 年前

我认为您可以使用Trang将.rnc压缩模式转换为.rng,它应该将外部模式合并到主模式中。一旦有了一个.rng文件,就可以将其转换为DTD。

另请参见 https://code.google.com/p/jing-trang/issues/detail?id=51 和 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=264706 .