DTD element empty and any

问题

In a dtd, can an element be defined as

<!ELEMENT name (ANY|EMPTY)>

meaning that an name can either be like <name/> or it can contain any elements that does break xml rules?

回答1:

No, but if you use the type ANY, it can still be empty.

Examples:

<!DOCTYPE name [
<!ELEMENT name ANY>
]>
<name/>

-

<!DOCTYPE name [
<!ELEMENT name ANY>
<!ELEMENT foo (#PCDATA)>
]>
<name>
    <foo/>
</name>

来源：https://stackoverflow.com/questions/12736648/dtd-element-empty-and-any