问题
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.
This is my schema:
<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>
I have two problems:
- 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.
- I'd like that idu filed of authorization element is an id that is present in one of the user elements (see [*] below).
- I'd like that the idao field of authorization element is an id that is present in one of the building elements OR one of the door elements.
[*] 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>
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!
回答1:
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>
回答2:
In my case I also had to declare and use an explicit namespace for the selectors. Use the solution from Ian Roberts
and adapt these attributes:
<xs:schema ...
xmlns:mc="http://mycompany.com"
...
>
...
<xs:selector xpath="mc:user" />
...
<xs:selector xpath="mc:authorization" />
...
</xs:element>
See also here https://stackoverflow.com/a/22353694/1909531
来源:https://stackoverflow.com/questions/20662664/how-to-use-unique-and-keyref-properly-in-xml-schema