XML Structures

Some data in XML documents are one dimensional, for example, <para>Sentence</para>. Some data, however, is structured, as shown in the following XML snippet.

<SubTotal>
  <Amount>2998</Amount>
  <CurrencyCode>USD</CurrencyCode>
  <FormattedPrice>$29.98</FormattedPrice>
</SubTotal>

This example shows that the subtotal is comprised of three pieces of data: Amount, CurrencyCode, and FormattedPrice. The example also shows that there can be a hierarchy of tags. In this example, Amount is a child tag of Subtotal. These structures represent arrays of values.