xsd - 从 RelaxNG 生成 XSD，同时保持根元素限制

Question

我想将以下架构从 RNC/RNG 转换为 W3C XSD。

default namespace = ""
namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"
namespace rng = "http://relaxng.org/ns/structure/1.0"

start = starting_risk

starting_risk =
  element risk {
    element continents { Continents }?
  }

Continents = element continent { Continent }+
Continent =
  element country { Country }*,
  element sea { Sea }*
Country = xsd:string { minLength = "1" maxLength = "100" }
Sea = xsd:string { minLength = "1" maxLength = "100" }

使用 trang，我最终得到

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
  <xs:element name="risk">
    <xs:complexType>
      <xs:sequence>
        <xs:element minOccurs="0" ref="continents"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="continents" type="Continents"/>
  <xs:complexType name="Continents">
    <xs:sequence>
      <xs:element maxOccurs="unbounded" ref="continent"/>
    </xs:sequence>
  </xs:complexType>
  <xs:element name="continent" type="Continent"/>
  <xs:complexType name="Continent">
    <xs:sequence>
      <xs:element minOccurs="0" maxOccurs="unbounded" ref="country"/>
      <xs:element minOccurs="0" maxOccurs="unbounded" ref="sea"/>
    </xs:sequence>
  </xs:complexType>
  <xs:element name="country" type="Country"/>
  <xs:element name="sea" type="Sea"/>
  <xs:simpleType name="Country">
    <xs:restriction base="xs:string">
      <xs:minLength value="1"/>
      <xs:maxLength value="100"/>
    </xs:restriction>
  </xs:simpleType>
  <xs:simpleType name="Sea">
    <xs:restriction base="xs:string">
      <xs:minLength value="1"/>
      <xs:maxLength value="100"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

问题是层次结构丢失了。“风险”元素是模式的根，也是该级别唯一有效的元素。在 RNC 中，“风险”和“大陆”元素之间的关系是父子关系。但在 XSD 中，它们是兄弟姐妹。我做错了什么/我不明白吗？

Answer 1