In XML we can specify the frequency of an element by using the symbols :
+ * ?
In an XML DTD the occurrence of a child element is controlled by cardinality operators placed after its name.
The plus sign means one or more times, the asterisk means zero or more times, and the question mark means zero or one time.
The symbols !, # and - have no meaning as occurrence indicators in a DTD.
So the frequency symbols are +, * and ?.
Hence, + * ?.
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