如何在XML模式中正确使用unique和keyref? [英] How to use unique and keyref properly in XML schema?

问题描述

我有这个XML模式，但是我不知道如何完成它才能实现我所需要的.我在网上搜索了很多有关唯一用法和keyref用法的信息，但我所能找到的只是基本示例.

I have this XML schema but I don't know how to complete it in order to achieve what I need. I searched a lot online about unique and keyref usage, but all I can find are basic examples.

这是我的模式:

    <xs:element name="access" type="myaccess" />

    <xs:complexType name="myaccess">
        <xs:sequence>
            <xs:element name="user" type="myuser" minOccurs="0" maxOccurs="unbounded">
                <xs:unique name="u_idunique">
                    <xs:selector xpath="user" />
                    <xs:field xpath="@id" />
                </xs:unique>
            </xs:element>
            <xs:element name="authorization" type="myauthorization" minOccurs="0" maxOccurs="unbounded">

            <!-- HERE I WANT A KEYREF TO id attribute of user element -->
            <!-- HERE I WANT A KEYREF TO id attribute of building element OR door element -->

            </xs:element>
            <xs:element name="building" type="mybuilding" minOccurs="0" maxOccurs="unbounded" >
                <!-- I DON'T KNOW HOW TO SPECIFY THAT id of building, id of door and id of gate are in the same scope -->
                <xs:unique name="b_idunique">
                    <xs:selector xpath="building" />
                    <xs:field xpath="@id" />
                </xs:unique>
            </xs:element>
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="myuser">
        <xs:attribute name="id" type="my_id" use="required" />
        <xs:attribute name="name" type="xs:string" use="required" />
        <xs:attribute name="phone" type="my_string_numeric" use="required" />
    </xs:complexType>

    <xs:complexType name="mybuilding">
        <xs:sequence>
            <xs:element name="door" type="mydoor" minOccurs="0" maxOccurs="unbounded">
                <!-- I DON'T KNOW HOW TO SPECIFY THAT id of building, id of door and id of gate are in the same scope -->
                <xs:unique name="d_idunique">
                    <xs:selector xpath="door" />
                    <xs:field xpath="@id" />
                </xs:unique>
            </xs:element>
        </xs:sequence>
        <xs:attribute name="id" type="my_id" use="required" />
        <xs:attribute name="name" type="xs:string" use="required" />
        <xs:attribute name="country" type="xs:string" use="required" />
    </xs:complexType>

    <xs:complexType name="mydoor">
        <xs:sequence>
            <xs:element name="gate" type="mygate" maxOccurs="unbounded">
                <!-- I DON'T KNOW HOW TO SPECIFY THAT id of building, id of door and id of gate are in the same scope -->
                <xs:unique name="g_idunique">
                    <xs:selector xpath="gate" />
                    <xs:field xpath="@id" />
                </xs:unique>
            </xs:element>
        </xs:sequence>
        <xs:attribute name="id" type="my_id" use="required" />
        <xs:attribute name="address" type="xs:string" use="required" />
        <xs:attribute name="status" type="mystatus" default="DISABLED" />
    </xs:complexType>

    <xs:complexType name="mygate">
        <xs:attribute name="id" type="my_id" use="required" />
        <xs:attribute name="type" type="mytype" use="required" />
        <xs:attribute name="status" type="mystatus" default="DISABLED" />
    </xs:complexType>

    <xs:complexType name="myauthorization">
        <xs:sequence>
            <xs:element name="validityperiod" type="myvalidityperiod" />
        </xs:sequence>
        <xs:attribute name="idu" type="my_id" use="required" />
        <xs:attribute name="idao" type="my_id" use="required" />
    </xs:complexType>

    <!-- OMITTED USELESS PART OF THE SCHEMA -->

</xs:schema>

我有两个问题:

• 我不知道如何指定建筑物的ID字段，门的ID字段和门的ID字段在同一范围内，并且我不能拥有2个ID等于(两个建筑物不能具有相同的ID，但门和建筑物不能共享相同的ID)
• 我不知道如何正确使用keyref元素.

• I don't know how to specify that the id field of building, the id field of door and the id field of gate are in the same scope and I can't have 2 id equals (two building can't have the same id, but also a door and a building can't share the same id)
• I don't know how to use correctly the keyref element.

1. 我希望授权元素的idu字段是存在于其中一个用户元素中的id(请参阅下面的[*]).
2. 我希望授权元素的idao字段是一个ID，它存在于一个建筑元素或一个门元素中.

[*]我试图写这个，但是不起作用:

[*] I tried to write this, but it's not working:

<xs:keyref name="useridkeyref" refer="u_idunique">
    <xs:selector xpath="authorization" />   
    <xs:field xpath="@idu" />
</xs:keyref>

我知道这不是一个简短的问题，在此先感谢大家阅读.希望我能有所帮助.谢谢！

I know this is not a short question and I thanks everyone in advance for reading it. I hope I can get some help. Thank you!

推荐答案

唯一约束和键的作用域位于element级别-您需要将约束不放在每个单独的元素内，而应放在access元素内是他们所有人的共同祖先.

Unique constraints and keys are scoped at the element level - you need to put the constraint not inside each individual element, but inside the access element that is a common ancestor of them all.

<xs:element name="access" type="myaccess">
  <xs:key name="user_id">
    <xs:selector xpath="user" />
    <xs:field xpath="@id" />
  </xs:key>
  <xs:key name="access_id">
    <xs:selector xpath="building | building/door | building/door/gate" />
    <xs:field xpath="@id" />
  </xs:key>
  <xs:keyref name="user_ref" refer="user_id">
    <xs:selector xpath="authorization" />
    <xs:field xpath="@idu" />
  </xs:keyref>
  <xs:keyref name="access_ref" refer="access_id">
    <xs:selector xpath="authorization" />
    <xs:field xpath="@idao" />
  </xs:keyref>
</xs:element>

这篇关于如何在XML模式中正确使用unique和keyref?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！