DTD versus XDR Schemas
DTDs validate XML data formats as do XML schemas, which include XDR and XSD. This section covers DTD versus XDR schemas in detail.
DTD
First look at the DTD, as shown in Listing A.4.
Listing A.4. An XML DTD
<?xml version='1.0' encoding='UTF-8' ?>
<!ELEMENT Transactions (Transaction+)>
<!ATTLIST Transactions location CDATA #REQUIRED
type CDATA #REQUIRED >
<!ELEMENT Transaction (Amount , Type , Facility , Location)>
<!ATTLIST Transaction date CDATA #REQUIRED
id CDATA #REQUIRED >
<!ELEMENT Amount (#PCDATA)*>
<!ATTLIST Amount currency (usd ) #REQUIRED >
<!ELEMENT Type (#PCDATA)*>
<!ELEMENT Facility (#PCDATA)*>
<!ELEMENT Location (Name , Address)>
<!ELEMENT Name (#PCDATA)*>
<!ELEMENT Address (#PCDATA)*>
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