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work began to define a stronger metadata capability for XML documents. Eventually, these efforts resulted in the XML Schema specification, described in the next section.
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XML Schema 1.0 became an official W3C recommendation in May 2001, and support for it is rapidly growing in commercial XML-related products. DTD s are still widely supported for backward compatibility, but XML Schema offers some compelling advantages, and addresses most of the shortcomings of DTD. Figure 25-7 shows the document schema for the purchase order document in Figure 25-5, this time defined using an XML Schema. It s useful to compare the XML Schema declaration in Figure 25-7 with the DTD declaration in Figure 25-6. Even this simple example shows the strong data type support in XML Schema; elements and attributes have data types that look very much like SQL data types. Also, the schema in Figure 25-7 is itself an XML document, so it is more readable for someone who is familiar with XML basics than the DTD in Figure 25-6.
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<schema xmlns="http://www.w3.org/2001/XMLSchema"> <element name="purchaseOrder" type="POType" /> <complexType name="POType"> <sequence> <element name="customerNumber" type="integer" /> <element name="orderNumber" type="integer" /> <element name="orderDate" type="date" /> <element name="repNumber" type="integer" length="3" /> <element name="terms"> <attribute name="ship" type="string" /> <attribute name="bill" type="string" /> </element> <element name="orderItem" minOccurs="0" maxOccurs="unbounded"> <complexType> <sequence> <element name="mfr" type="string" length="3" /> <element name="product" type="string" /> <element name="qty" type="integer" /> <element name="amount" type="decimal" fractionDigits="2" /> </sequence> </complextype> </element> </sequence> </complexType> </schema>
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From a database point of view, XML Schema s strong support for data types and data structures is one of its major advantages. XML Schema defines over 20 built-in data types, which correspond fairly closely to the defined SQL data types. Table 25-1 lists the most important XML Schema built-in data types for database processing.
XML Schema Data Type
Numeric data Integer PositiveInteger NegativeInteger NonNegativeInteger NonPositiveInteger Int UnsignedInt Long UnsignedLong Short UnsignedShort Decimal Float Double Character data String NormalizedString Token
Description
Integer number Positive integers only Negative integers only Zero or positive integers only Zero or negative integers only 32-bit signed integer 32-bit unsigned integer 64-bit signed integer 64-bit unsigned integer 16-bit signed integer 16-bit unsigned integer Numeric, with possible decimal places Standard precision floating point Double precision floating point Variable-length character string String, with newline, carriage return, and tab characters converted to spaces String, processed like normalizedString, plus leading/trailing space removal and multiple spaces collapsed to a single space
Table 25-1.
XML Schema Built-In Data Types
25:
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XML Schema Data Type
Date and time data Time DateTime Duration Date Gmonth Gyear Gday GmonthDay Other data Boolean Byte UnsignedByte base64Binary HexBinary AnyURI Language Table 25-1.
Description
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Time of day (hr/min/seconds/thousandths) Day and time (equivalent to SQL TIMESTAMP) Length of time (equivalent to SQL DURATION) Year/month/day only Gregorian month (1 to 12) Gregorian year (0000 to 9999) Gregorian day (1 to 31) Gregorian month/day TRUE/FALSE value Single byte data, with assumed sign bit Single byte data, no sign bit Binary data, expressed with base 64 notation Binary data, expressed with hexadecimal notation Internet URI, such as http://www.w3.org Valid XML language (English, French )
XML Schema Built-In Data Types (continued)
Like the SQL2 and SQL3 standards, XML Schema supports user-defined data types that are derived from these built-in types or from other user-defined types. You can specify a derived data type as a restriction on another XML type. For example, here is a definition for a derived repNumType type that restricts legal employee numbers to a range from 101 to 199:
<simpleType name="repNumType"> <restriction base="integer"> <minInclusive value="101" /> <maxExclusive value="200" /> </restriction> </simpleType>
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With this data type defined, you can declare entities or attributes in a schema as having a data type of repNumType and the restriction is automatically implemented. XML Schema provides a rich set of data type characteristics (called facets) on which you can build restrictions. These include data length (for strings and binary data), inclusive and exclusive data ranges, number of digits and fractional digits (for numeric data), and explicit lists of permitted values. There is even a built-in pattern-matching capability, where data values can be restricted using a regular expression syntax like that used in the Perl scripting language. XML Schema also gives you the ability to define complex data types, which are user-defined structures. For example, here is a definition for a complex custAddrType type that is comprised of familiar subelements:
<complexType name="custAddrType"> <sequence> <element name="street" type="string" /> <element name="city" type="string" /> <element name="state" type="string" /> <element name="postCode" type="integer" /> </sequence> </complexType>
You can also create a user-defined data type that is a list of data items with another type. For example, here is a definition for a complex repListType type, which is a list of salesperson employee numbers:
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