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XML Reference: Siebel eBusiness Application Integration Volume V > XML Integration Objects and the DTD Wizard > How the DTD Wizard Creates XML Integration Objects >

Cardinality

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As shown in Table 15, the DTD syntax allows you to specify a cardinality—that is, the number of times an element can appear within an XML document—for elements using the modifiers question mark (?), plus sign (+), and asterisk (*), or none. Elements with a cardinality, or occurrence, specified in a DTD map only to Integration Components. The Cardinality property in the Integration Component within Siebel maps to the specified cardinality information in the DTD.

Table 15.  Rules for Mapping for Cardinality Within a DTD

DTD Element Occurrence Operator	Description	Integration Component Cardinality Property	Description
	Appears one time	-	-
?	Appears 0 or 1 time	Zero or One	Appears 0 or 1 time
+	Appears 1 or more times	One or More	Appears 1 or more times
*	May appear 0 or more times	Zero or More	May appear 0 or more times
No modifier	Appears one time	One	Appears one time

The specification for DTDs supports using parentheses to express complex hierarchical structures. For example:

<!ELEMENT rating ((tutorial | reference)*, overall)+ >

The DTD Wizard uses the operator (?, *, +, or "none") closest to the child element as that child element's cardinality. In addition, the DTD Wizard will ignore such grouping by parentheses as illustrated above.

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