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III Object Based Databases and XML
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10 XML
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The account element is de ned to contain subelements account-number, branchname and balance (in that order) Similarly, customer and depositor have the attributes in their schema de ned as subelements Finally, the elements account-number, branch-name, balance, customer-name, customer-street, and customer-city are all declared to be of type #PCDATA The keyword #PCDATA indicates text data; it derives its name, historically, from parsed character data Two other special type declarations are empty, which says that the element has no contents, and any, which says that there is no constraint on the subelements of the element; that is, any elements, even those not mentioned in the DTD, can occur as subelements of the element The absence of a declaration for an element is equivalent to explicitly declaring the type as any The allowable attributes for each element are also declared in the DTD Unlike subelements, no order is imposed on attributes Attributes may speci ed to be of type CDATA, ID, IDREF, or IDREFS; the type CDATA simply says that the attribute contains character data, while the other three are not so simple; they are explained in more detail shortly For instance, the following line from a DTD speci es that element account has an attribute of type acct-type, with default value checking <!ATTLIST account acct-type CDATA checking > Attributes must have a type declaration and a default declaration The default declaration can consist of a default value for the attribute or #REQUIRED, meaning that a value must be speci ed for the attribute in each element, or #IMPLIED, meaning that no default value has been provided If an attribute has a default value, for every element that does not specify a value for the attribute, the default value is lled in automatically when the XML document is read An attribute of type ID provides a unique identi er for the element; a value that occurs in an ID attribute of an element must not occur in any other element in the same document At most one attribute of an element is permitted to be of type ID
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<!DOCTYPE bank-2 [ <!ELEMENT account ( branch, balance )> <!ATTLIST account account-number ID #REQUIRED owners IDREFS #REQUIRED > <!ELEMENT customer ( customer-name, customer-street, customer-city )> <!ATTLIST customer customer-id ID #REQUIRED accounts IDREFS #REQUIRED > declarations for branch, balance, customer-name, customer-street and customer-city ]> Figure 107
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DTD with ID and IDREF attribute types
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III Object Based Databases and XML
10 XML
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XML Document Schema
An attribute of type IDREF is a reference to an element; the attribute must contain a value that appears in the ID attribute of some element in the document The type IDREFS allows a list of references, separated by spaces Figure 107 shows an example DTD in which customer account relationships are represented by ID and IDREFS attributes, instead of depositor records The account elements use account-number as their identi er attribute; to do so, account-number has been made an attribute of account instead of a subelement The customer elements have a new identi er attribute called customer-id Additionally, each customer element contains an attribute accounts, of type IDREFS, which is a list of identi ers of accounts that are owned by the customer Each account element has an attribute owners, of type IDREFS, which is a list of owners of the account Figure 108 shows an example XML document based on the DTD in Figure 107 Note that we use a different set of accounts and customers from our earlier example, in order to illustrate the IDREFS feature better The ID and IDREF attributes serve the same role as reference mechanisms in objectoriented and object-relational databases, permitting the construction of complex data relationships
<bank-2> <account account-number= A-401 owners= C100 C102 > <branch-name> Downtown </branch-name> <balance> 500 </balance> </account> <account account-number= A-402 owners= C102 C101 > <branch-name> Perryridge </branch-name> <balance> 900 </balance> </account> <customer customer-id= C100 accounts= A-401 > <customer-name>Joe</customer-name> <customer-street> Monroe </customer-street> <customer-city> Madison </customer-city> </customer> <customer customer-id= C101 accounts= A-402 > <customer-name>Lisa</customer-name> <customer-street> Mountain </customer-street> <customer-city> Murray Hill </customer-city> </customer> <customer customer-id= C102 accounts= A-401 A-402 > <customer-name>Mary</customer-name> <customer-street> Erin </customer-street> <customer-city> Newark </customer-city> </customer> </bank-2> Figure 108
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