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WithoutSchema(3)EvaluateQuery
ELEMENT p {
ELEMENT au {AnyType}*
}*
<p><au>Paul<au></p>
<p><au>Mary<au></p>
...
...
AnyType
append(
map($v, element-node(“p“,(),(),$v,“Any“)),
append(map ($dot,children($dot)),$d)
)
)
FOR $v IN $d/au
RETURN <p>{$v}</p>
<au>Paul</au>
<au>Mary</au>
FOR $v IN
(FOR $dot IN $d RETURN child::““:au)
RETURN ELEMENT ““:p {$v}
XQuery
Processor
XQuery
Parser
Wellformed XML
Parser
Type Inference &
Type Check
XQuery
Normalizer
XQuery
Compiler
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Without Schema (4) Dynamic Error
ELEMENT p {
ELEMENT au {double}*
}*
...
...
AnyType
append(
map($v, element-node(“p“,(),(),number($v)+1,“p“)),
append(map ($dot,children($dot)),$d)
)
)
FOR $v IN $d/au
RETURN <p>{$v+1}</p>
<au>Paul</au>
<au>Mary</au>
FOR $v IN
(FOR $dot IN $d RETURN child::““:au)
RETURN ELEMENT ““:p {
number($v)+1}
XQuery
Processor
XQuery
Parser
Wellformed XML
Parser
Type Inference &
Type Check
XQuery
Normalizer
XQuery
Compiler
Dynamic
Error
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C#: How to Open a File from a URL (HTTP, FTP) in HTML5 Viewer
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With Schema (1) Generate Types
GROUP d {ELEMENT au*}
ELEMENT au {string}
FOR $v IN $d/au
RETURN <p>{$v}</p>
<au>Paul</au>
<au>Mary</au>
XML Schema
Parser
<element name= “au“
type= “string“/>
<group name= “d“>
<element ref= “au“
minOccurs= “0“
maxOccurs=“unbounded“/>
</group>
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Imaging, VB.NET OCR, VB.NET Twain, VB.NET Barcode Read, VB.NET C# Demo Codes for PDF Conversions. 2. Add web document viewer into your C# project aspx web page.
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With Schema (2) Infer Type
ELEMENT p {
ELEMENT au {string}
}*
...
GROUP d {ELEMENT au*}
ELEMENT au {string}
FOR $v IN $d/au
RETURN <p>{$v}</p>
<au>Paul</au>
<au>Mary</au>
FOR $v IN
(FOR $dot IN $d RETURN child::““:au)
RETURN ELEMENT ““:p {$v}
XQuery
Parser
XML Schema
Parser
Type Inference &
Type Check
XQuery
Normalizer
<element name= “au“
type= “string“/>
<group name= “d“>
<element ref= “au“
minOccurs= “0“
maxOccurs=“unbounded“/>
</group>
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With Schema (3) Validate and Evaluate
<au>Paul</au>
<au>Mary</au>
ELEMENT p {
ELEMENT au {string}
}*
<p><au>Paul<au></p>
<p><au>Mary<au></p>
...
...
GROUP d {ELEMENT au*}
ELEMENT au {string}
append(
map($v, element-node(“p“,(),(),$v,“p“)),
append(map ($dot,children($dot)),$d)
)
)
FOR $v IN $d/au
RETURN <p>{$v}</p>
<au>Paul</au>
<au>Mary</au>
FOR $v IN
(FOR $dot IN $d RETURN child::““:au)
RETURN ELEMENT ““:p {$v}
XQuery
Processor
XQuery
Parser
Wellformed XML
Parser
XML Schema
Parser
Type Inference &
Type Check
XML Schema
Validator
XQuery
Normalizer
XQuery
Compiler
<element name= “au“
type= “string“/>
<group name= “d“>
<element ref= “au“
minOccurs= “0“
maxOccurs=“unbounded“/>
</group>
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for editing PDF document hyperlink (url) and quick navigation link in PDF bookmark. C#.NET: Edit PDF Metadata. PDF SDK for .NET allows you to read, add, edit
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VB.NET PDF: Basic SDK Concept of XDoc.PDF
XDoc.PDF for .NET allows VB.NET developers to edit hyperlink of PDF document, including editing PDF url links and quick navigation link in bookmark/outline.
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With Schema (4) Static Error
ELEMENT p {ELEMENT au}* Ë
ELEMENT p {ELEMENT au}+
Static
Error
...
GROUP d {ELEMENT au*}
ELEMENT au {string}
ELEMENT p {ELEMENT au}+
ASSERT AS ELEMENT p
FOR $v IN $d/au
RETURN <p>{$v}</p>
<au>Paul</au>
<au>Mary</au>
FOR $v IN
(FOR $dot IN $d RETURN child::““:au)
RETURN ELEMENT ““:p {$v}
XQuery
Parser
XML Schema
Parser
Type Inference &
Type Check
XQuery
Normalizer
<element name= “p“>
<complexType>
<element ref= “au“
minOccurs= “1“
maxOccurs=“unbounded“/>
</complexType>
</element>
<element name= “au“
type= “string“/>
<group name= “d“>
<element ref= “au“
minOccurs= “0“
maxOccurs=“unbounded“/>
</group>
Part IV
From XML Schema
to XQuery Types
XML Schema vs. XQuery Types
• XML Schema:
structural constraints on types
name constraints on types
range and identity constraints on values
type assignment and determinism constraint
• XQuery Types asa subset:
structural constraints on types
local and global elements
derivation hierarchies, substitution groups by union
name constraints are anopen issue
no costly range and identity constraints
• XQuery Types asa superset:
XQuery needs closure for inferred types, thus no determinism
constraint and no consistent element restriction.
XQuery Types
unit type u ::=
string
string
|
integer
integer
|
attribute a { t } attribute
|
attribute * { t } wildcard attribute
|
element a { t }
element
|
element * { t }
wildcard element
type
::=
u
unit type
|
()
empty sequence
|
t, t
sequence
|
t| t
choice
|
t?
optional
|
t+
one or more
|
t*
zero or more
|
x
type reference
Expressive power of XQuery types
Tree grammars and tree automata
deterministic non-deterministic
top-down
Class 1
Class 2
bottom-up
Class 2
Class 2
Tree grammarClass0: DTD (global elements only)
Tree automataClass 1: Schema (determinism constraint)
Tree automataClass 2: XQuery, XDuce, Relax
Class 0<Class 1<Class2
Class 0and Class2 havegoodclosure properties.
Class 1does not.
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