9. Defining Uniqueness, Keys and Key References (samples)

Sample 1


  

  <book identifier="isbn-0836217462">
    <isbn>
      0836217462
    </isbn>
    <title>
      Being a Dog Is a Full-Time Job
    </title>
    <author-ref ref="au-Charles_M._Schulz"/>
    <character-refs>
      ch-Peppermint_Patty ch-Snoopy ch-Schroeder ch-Lucy
    </character-refs>
  </book>

Sample 2

  

  <xs:element name="book">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="isbn" type="xs:int"/>
        <xs:element name="title" type="xs:string"/>
        <xs:element name="author-ref">
          <xs:complexType>
            <xs:attribute name="ref" type="xs:IDREF" use="required"/>
          </xs:complexType>
        </xs:element>
        <xs:element name="character-refs" type="xs:IDREFS"/>
      </xs:sequence>
      <xs:attribute name="identifier" type="xs:ID" use="required"/>
    </xs:complexType>
  </xs:element>

Sample 3


 

  <xs:element name="book" maxOccurs="unbounded">
    <xs:complexType>
      .../...
    </xs:complexType>
    <xs:unique name="book">
      .../...
    </xs:unique>
  </xs:element>

Sample 4


 

  <xs:element name="book" maxOccurs="unbounded">
    <xs:complexType>
      .../...
    </xs:complexType>
    <xs:unique name="book">
      <xs:selector xpath="book"/>
      .../...
    </xs:unique>
  </xs:element>

Sample 5


 

  <xs:element name="book" maxOccurs="unbounded">
    <xs:complexType>
      .../...
    </xs:complexType>
    <xs:unique name="book">
      <xs:selector xpath="book"/>
      <xs:field xpath="isbn"/>
    </xs:unique>
  </xs:element>

Sample 6


 

  <xs:element name="library">
    <xs:complexType>
      .../...
    </xs:complexType>
    <xs:unique name="author">
      <xs:selector xpath="author"/>
      <xs:field xpath="first-name"/>
      <xs:field xpath="middle-name"/>
      <xs:field xpath="last-name"/>
    </xs:unique>
  </xs:element>

Sample 7


 

  <xs:element name="library">
    <xs:complexType>
      .../...
    </xs:complexType>
    <xs:key name="book">
      <xs:selector xpath="book"/>
      <xs:field xpath="isbn"/>
    </xs:key>
  </xs:element>

Sample 8




  <library>
    <books>
      <book>
        .../...
        <author-ref ref="Charles M. Schulz"/>
        .../...
      </book>
      .../...
    </books>
    <authors>
      <author>
        <name>
          Charles M. Schulz
        </name>
        .../...
      </author>
      .../...
    </authors>
  </library>

Sample 9




  <library>
    <books>
      <book>
        .../...
        <author-ref ref="Charles M. Schulz"/>
        .../...
      </book>
      .../...
    </books>
    <authors>
      <category id="comics">
        <author>
          <name>
            Charles M. Schulz
          </name>
          .../...
        </author>
        .../...
      </category>
      <category id="novels">
        .../...
      </category>
      .../...
    </authors>
  </library>

Sample 10

xpath="author"

Sample 11

xpath="author|character"

Sample 12

xpath="lib:author"

Sample 13

xpath="*"

Sample 14

xpath="lib:*"

Sample 15

xpath="authors/author"

Sample 16

xpath=".//author"

Sample 17

xpath="author/@id"

Sample 18

xpath="@id|@name"

Sample 19

xpath="/library/author"

Sample 20

xpath="../author"

Sample 21

xpath=".//*[@id]"

Sample 22

xpath="author[@type='comics']"

Sample 23

xpath="substring-after(@xlink:href, '#')"

Sample 24

xpath="//author"

Sample 25



 
  <library xsi:noNamespaceSchemaLocation="library-keys-id-key.xsd"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <book id="isbn-0836217462">
      <isbn>
        0836217462
      </isbn>
      <title>
        Being a Dog Is a Full-Time Job
      </title>
      <author-ref ref="au-Charles_M._Schulz"/>
      <character-ref ref="ch-Peppermint_Patty"/>
      <character-ref ref="ch-Snoopy"/>
      <character-ref ref="ch-Schroeder"/>
      <character-ref ref="ch-Lucy"/>
    </book>
    .../...
    <author id="au-Charles_M._Schulz">
      <name>
        Charles M. Schulz
      </name>
      <nickName>
        SPARKY
      </nickName>
      <born>
        November 26, 1922
      </born>
      <dead>
        February 12, 2000
      </dead>
    </author>
    <character id="ch-Peppermint_Patty">
      <name>
        Peppermint Patty
      </name>
      <since>
        Aug. 22, 1966
      </since>
      <qualification>
        bold, brash and tomboyish
      </qualification>
    </character>
    ...
  </library>

Sample 26


  

  <xs:element name="library">
    <xs:complexType>
      .../...
    </xs:complexType>
    <xs:key name="ID">
      <xs:selector xpath="book|author|character"/>
      <xs:field xpath="@id"/>
    </xs:key>
    <xs:keyref name="IDREF" refer="ID">
      <xs:selector xpath="book/author-ref|book/character-ref"/>
      <xs:field xpath="@ref"/>
    </xs:keyref>
  </xs:element>

Sample 27


  <book id="b0836217462" available="true">
    <isbn>
      0836217462
    </isbn>
    <title lang="en">
      Being a Dog Is a Full-Time Job
    </title>
    ../..
  </book>

Sample 28

 
  <book id="b0836217462" available="true" isbn="0836217462"
    title="Beinga Dog Is a Full-Time Job">
    .../...
  </book>

Sample 29

		

  <xs:complexType>
    <xs:sequence>
      <xs:element ref="isbn" minOccurs="0"/>
      <xs:element ref="title" minOccurs="0"/>
      <xs:element ref="author" minOccurs="0" maxOccurs="unbounded"/>
      <xs:element ref="character" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
    <xs:attribute ref="id"/>
    <xs:attribute ref="available"/>
    <xs:attribute ref="isbn"/>
    <xs:attribute ref="title"/>
  </xs:complexType>

Sample 30


  <xs:key name="isbn">
    <xs:selector xpath="."/>
    <xs:field xpath="isbn|@isbn"/>
  </xs:key>

		

  <xs:key name="title">
    <xs:selector xpath="."/>
    <xs:field xpath="title|@title"/>
  </xs:key>

Sample 31


  <xs:element name="book">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="isbn" minOccurs="0"/>
        <xs:element ref="title" minOccurs="0"/>
        <xs:element ref="author" minOccurs="0" maxOccurs="unbounded"/> 
        <xs:element ref="character" minOccurs="0"
          maxOccurs="unbounded"/>
      </xs:sequence>
      <xs:attribute ref="id"/>
      <xs:attribute ref="available"/>
      <xs:attribute ref="isbn"/>
      <xs:attribute ref="title"/>
    </xs:complexType>
    <xs:key name="isbn">
      <xs:selector xpath="."/>
      <xs:field xpath="isbn|@isbn"/>
    </xs:key>
    <xs:key name="title">
      <xs:selector xpath="."/>
      <xs:field xpath="title|@title"/>
    </xs:key>
  </xs:element>