PartI.4
Projection
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Projection
Return allauthors ofall books
/BOOKS/BOOK/AUTHOR
<AUTHOR>Abiteboul</AUTHOR>,
<AUTHOR>Buneman</AUTHOR>,
<AUTHOR>Suciu</AUTHOR>,
<AUTHOR>Buneman</AUTHOR>
element AUTHOR { xsd:string } *
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VB.NET PDF: Basic SDK Concept of XDoc.PDF
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Laws — relating XPath to XQuery
Return all authors of all books
/BOOKS/BOOK/AUTHOR
=
for $dot1 in $root/BOOKS return
for $dot2 in $dot1/BOOK return
$dot2/AUTHOR
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Laws — Associativity
Associativity in XPath
BOOKS/(BOOK/AUTHOR)
=
(BOOKS/BOOK)/AUTHOR
Associativity in XQuery
for $dot1 in $root/BOOKS return
for $dot2 in $dot1/BOOK return
$dot2/AUTHOR
=
for $dot2 in (
for $dot1 in $root/BOOKS return
$dot1/BOOK
) return
$dot2/AUTHOR
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Part I.5
Selection
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Selection
Return titles of all books published before 2000
/BOOKS/BOOK[@YEAR < 2000]/TITLE
<TITLE>Data on the Web</TITLE>
element TITLE { xsd:string } *
Laws — relating XPath to XQuery
Return titles of all books published before 2000
/BOOKS/BOOK[@YEAR < 2000]/TITLE
=
for $book in /BOOKS/BOOK
where $book/@YEAR < 2000
return $book/TITLE
Laws — mapping into XQuery core
Comparison defined by existential
$book/@YEAR < 2000
=
some $year in $book/@YEAR satisfies $year < 2000
Existential defined by iteration with selection
some $year in $book/@YEAR satisfies $year < 2000
=
not(empty(
for $year in $book/@YEAR where $year < 2000 returns $year
))
Selection defined by conditional
for $year in $book/@YEAR where $year < 2000 returns $year
=
for $year in $book/@YEAR returns
if $year < 2000 then $year else ()
Laws — mapping into XQuery core
/BOOKS/BOOK[@YEAR < 2000]/TITLE
=
for $book in /BOOKS/BOOK return
if (
not(empty(
for $year in $book/@YEAR returns
if $year < 2000 then $year else ()
))
) then
$book/TITLE
else
()
Selection — Type may be too broad
Return book with title ”Data on the Web”
/BOOKS/BOOK[TITLE = "Data on the Web"]
<BOOK YEAR="1999 2003">
<AUTHOR>Abiteboul</AUTHOR>
<AUTHOR>Buneman</AUTHOR>
<AUTHOR>Suciu</AUTHOR>
<TITLE>Data on the Web</TITLE>
<REVIEW>A <EM>fine</EM> book.</REVIEW>
</BOOK>
BOOK*
How do we exploit keys and relative keys?
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