What is the difference between IDREF and IDREFS in XSD?
I know they both reference the ID attribute, but what is the difference? When each one of them is used?
XSD中IDREF和IDREFS有什么区别？我知道他们都引用了ID属性，但有什么区别？当他们每个人使用？
1 个解决方案
#1
12
An attribute of type IDREF is a reference to some other element with an attribute of type ID.
IDREF类型的属性是对具有ID类型属性的其他元素的引用。
An attribute of type IDREFS is a list of references to elements with ID attributes, separate by spaces.
IDREFS类型的属性是具有ID属性的元素的引用列表，由空格分隔。
An example:
一个例子：
You're creating a family tree. Each person has 2 parents, a mother and a father. This would be denoted by IDREFS like so:
你正在创建一个家谱。每个人有2个父母，一个母亲和一个父亲。这将由IDREFS表示如下：
<person person_id="e10001" parent_id="e10002 e10003">
with
同
<!ATTLIST person
person_id ID #REQUIRED
parent_id IDREFS #IMPLIED>
#1
12
An attribute of type IDREF is a reference to some other element with an attribute of type ID.
IDREF类型的属性是对具有ID类型属性的其他元素的引用。
An attribute of type IDREFS is a list of references to elements with ID attributes, separate by spaces.
IDREFS类型的属性是具有ID属性的元素的引用列表，由空格分隔。
An example:
一个例子：
You're creating a family tree. Each person has 2 parents, a mother and a father. This would be denoted by IDREFS like so:
你正在创建一个家谱。每个人有2个父母，一个母亲和一个父亲。这将由IDREFS表示如下：
<person person_id="e10001" parent_id="e10002 e10003">
with
同
<!ATTLIST person
person_id ID #REQUIRED
parent_id IDREFS #IMPLIED>