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Document type de nitions are strongly connected to the document formatting heritage of XML Because of this, they are unsuitable in many ways for serving as the type structure of XML for data processing applications Nevertheless, a tremendous number of data exchange formats are being de ned in terms of DTDs, since they were part of the original standard Here are some of the limitations of DTDs as a schema mechanism Individual text elements and attributes cannot be further typed For instance, the element balance cannot be constrained to be a positive number The lack of such constraints is problematic for data processing and exchange applications, which must then contain code to verify the types of elements and attributes It is dif cult to use the DTD mechanism to specify unordered sets of subelements Order is seldom important for data exchange (unlike document layout, where it is crucial) While the combination of alternation (the | operation) and the operation as in Figure 106 permits the speci cation of unordered collections of tags, it is much more dif cult to specify that each tag may only appear once There is a lack of typing in IDs and IDREFs Thus, there is no way to specify the type of element to which an IDREF or IDREFS attribute should refer As a result, the DTD in Figure 107 does not prevent the owners attribute of an account element from referring to other accounts, even though this makes no sense
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An effort to redress many of these DTD de ciencies resulted in a more sophisticated schema language, XMLSchema We present here an example of XMLSchema, and list some areas in which it improves DTDs, without giving full details of XMLSchema s syntax Figure 109 shows how the DTD in Figure 106 can be represented by XMLSchema The rst element is the root element bank, whose type is declared later The example then de nes the types of elements account, customer, and depositor Observe the use of types xsd:string and xsd:decimal to constrain the types of data elements Finally the example de nes the type BankType as containing zero or more occurrences of each of account, customer and depositor XMLSchema can de ne the minimum and maximum number of occurrences of subelements by using minOccurs and maxOccurs The default for both minimum and maximum occurrences is 1, so these have to be explicity speci ed to allow zero or more accounts, deposits, and customers Among the bene ts that XMLSchema offers over DTDs are these: It allows user-de ned types to be created It allows the text that appears in elements to be constrained to speci c types, such as numeric types in speci c formats or even more complicated types such as lists or union
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10 XML
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XML Document Schema
<xsd:schema xmlns:xsd= http://wwww3org/2001/XMLSchema > <xsd:element name= bank type= BankType /> <xsd:element name= account > <xsd:complexType> <xsd:sequence> <xsd:element name= account-number type= xsd:string /> <xsd:element name= branch-name type= xsd:string /> <xsd:element name= balance type= xsd:decimal /> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name= customer > <xsd:element name= customer-number type= xsd:string /> <xsd:element name= customer-street type= xsd:string /> <xsd:element name= customer-city type= xsd:string /> </xsd:element> <xsd:element name= depositor > <xsd:complexType> <xsd:sequence> <xsd:element name= customer-name type= xsd:string /> <xsd:element name= account-number type= xsd:string /> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:complexType name= BankType > <xsd:sequence> <xsd:element ref= account minOccurs= 0 maxOccurs= unbounded /> <xsd:element ref= customer minOccurs= 0 maxOccurs= unbounded /> <xsd:element ref= depositor minOccurs= 0 maxOccurs= unbounded /> </xsd:sequence> </xsd:complexType> </xsd:schema> Figure 109
XMLSchema version of DTD from Figure 106
It allows types to be restricted to create specialized types, for instance by specifying minimum and maximum values It allows complex types to be extended by using a form of inheritance It is a superset of DTDs It allows uniqueness and foreign key constraints It is integrated with namespaces to allow different parts of a document to conform to different schema It is itself speci ed by XML syntax, as Figure 109 shows
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