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We know that in the RDB world, a schema is defined when designing tables to stipulate category (column) data types and data sizes, set the primary key, associate tables with other tables, etc. "customer" occurs once, and "product" may occur zero or more times.
The application must perform a check to see whether the content of an element is actually a number.
When a child element occurs as the content of an element, the element name of the child element occurring is designated in the Content Model.
However, the order of occurrence and number of occurrences of the child element must also be defined.
When there are a multiple number of child elements, you must designate the order of occurrence.
The following shows the syntax for an Element Type Declaration.