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Sample Data: A Bibliography

This chapter uses bibliography data to illustrate the basic features of XQuery. The data used is taken from the XML Query Use Cases, Use Case "XMP," and originally appeared in [EXEMPLARS]. We have modified the data slightly to illustrate some of the points to be made. The data used appears in Listing 1.1.

Listing 1.1 Bibliography Data for Use Case "XMP"

<bib>

<book year="1994">
<title>TCP/IP Illustrated</title>
<author><last>Stevens</last><first>W.</first></author>
<publisher>Addison-Wesley</publisher>
<price>65.95</price>

</book> 

<book year="1992">
<title>Advanced Programming in the UNIX Environment</title>
<author><last>Stevens</last><first>W.</first></author>
<publisher>Addison-Wesley</publisher>
<price>65.95</price>
</book>

<book year="2000">
<title>Data on the Web</title>
<author><last>Abiteboul</last><first>Serge</first></author>
<author><last>Buneman</last><first>Peter</first></author>
<author><last>Suciu</last><first>Dan</first></author>
<publisher>Morgan Kaufmann Publishers</publisher>
<price>65.95</price>

</book>

<book year="1999">
<title>The Economics of Technology and Content
for Digital TV</title>

<editor>
<last>Gerbarg</last>
<first>Darcy</first>
<affiliation>CITI</affiliation>

</editor>
<publisher>Kluwer Academic Publishers</publisher>
<price>129.95</price>

</book>

</bib>

The data for this example was created using a DTD, which specifies that a bibliography is a sequence of books, each book has a title, publication year (as an attribute), an author or an editor, a publisher, and a price, and each author or editor has a first and a last name, and an editor has an affiliation. Listing 1.2 provides the DTD for our example.

Listing 1.2 DTD for the Bibliography Data

<!ELEMENT bib (book* )>
<!ELEMENT book (title, (author+ | editor+ ), publisher, price )>
<!ATTLIST book year CDATA #REQUIRED >
<!ELEMENT author (last, first )>
<!ELEMENT editor (last, first, affiliation )>
<!ELEMENT title (#PCDATA )>
<!ELEMENT last (#PCDATA )>
<!ELEMENT first (#PCDATA )>
<!ELEMENT affiliation (#PCDATA )>
<!ELEMENT publisher (#PCDATA )>
<!ELEMENT price (#PCDATA )>