6. Java basic I/O 5. Java and XML

Сентябрь 7, 2022

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6. Java basic I/O 5. Java and XML

Содержание

2. Why XML? XML is a very useful technology for describing structured information XML tools make it
3. XML Example 4.0.0 webapp.sample web-parent 1.0-SNAPSHOT web-app jar Web Demo - Application UI project * Infopulse
4. What is an XML? Extensible Markup Language (XML) is a markup language that defines a set
5. The Structure of an XML Document An XML document should start with a header such as
6. XML Example 4.0.0 webapp.sample web-parent 1.0-SNAPSHOT web-app jar Web Demo - Application UI project * Infopulse
7. Element A logical document component either begins with a start-tag and ends with a matching end-tag
8. Element (continued) An element can contain child elements, text, or both: webapp.sample web-parent 1.0-SNAPSHOT * Infopulse
9. Attributes A markup construct consisting of a name/value pair that exists within a start-tag or empty-element
10. Parsing an XML Document To process an XML document, you need to parse it: read a
11. Java XML Parsers Tree parser - Document Object Model (DOM) that read an XML document into
12. XML namespace XML namespaces are used for providing uniquely named elements and attributes in an XML
13. Namespace declaration An XML namespace is declared using the reserved XML attribute xmlns or xmlns:prefix, the
14. Default Namespace It is also possible to declare a default namespace: xmlns="http://www.w3.org/1999/xhtml" In this case, any
15. Well-formed XML document Well-formed = correct syntax The begin, end, and empty-element tags that delimit the
16. Valid XML Document Valid = well-formed + semantic-correct Semantic is described with: Document Type Definition (DTD)
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Слайд 2

Why XML?
XML is a very useful technology for describing structured information
XML

tools make it easy to process and transform information
XML has employed as the base language for communication protocols
XML is widely used as protocol language in Java EE APIs

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Слайд 3

XML Example

4.0.0

webapp.sample
web-parent
1.0-SNAPSHOT

web-app
jar
Web Demo - Application UI project

Infopulse Training Center

Слайд 4

What is an XML?
Extensible Markup Language (XML) is a markup language

that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable
It is a textual data format with strong support documents structure along with arbitrary data structures

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Слайд 5

The Structure of an XML Document
An XML document should start with

a header such as or
A header is optional, but it is highly recommended
The body of the XML document contains the root element (only one!), which can contain other elements (child elements)

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Слайд 6

XML Example

4.0.0

webapp.sample
web-parent
1.0-SNAPSHOT

web-app
jar
Web Demo - Application UI project

Infopulse Training Center

Слайд 7

Element
A logical document component either begins with a start-tag and ends

with a matching end-tag or consists only of an empty-element tag: 4.0.0

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Слайд 8

Element (continued)
An element can contain child elements, text, or both:

webapp.sample

web-parent
1.0-SNAPSHOT

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Слайд 9

Attributes
A markup construct consisting of a name/value pair that exists within

a start-tag or empty-element tag:

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Слайд 10

Parsing an XML Document
To process an XML document, you need to

parse it:
read a file
confirm that the file has the correct format
break it up into the constituent elements
access those elements

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Слайд 11

Java XML Parsers
Tree parser - Document Object Model (DOM) that read

an XML document into a tree structure.
Streaming parser - Simple API for XML (SAX) that generate events as they read an XML document.

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Слайд 12

XML namespace
XML namespaces are used for providing uniquely named elements and

attributes in an XML document
A namespace name is a uniform resource identifier (URI)
Typically, the URI chosen for the namespace of a given XML vocabulary describes a resource under the control of the author or organization defining the vocabulary

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Слайд 13

Namespace declaration
An XML namespace is declared using the reserved XML attribute

xmlns or xmlns:prefix, the value of which must be a valid namespace name:
xmlns:xhtml="http://www.w3.org/1999/xhtml"
Any element or attribute whose name starts with the prefix "xhtml:" is considered to be in the XHTML namespace

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Слайд 14

Default Namespace
It is also possible to declare a default namespace:
xmlns="http://www.w3.org/1999/xhtml"
In

this case, any element without a namespace prefix is considered to be in the XHTML namespace, if it or an ancestor has the above default namespace declaration
Attributes are never subject to the default namespace

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Слайд 15

Well-formed XML document
Well-formed = correct syntax
The begin, end, and empty-element tags

that delimit the elements are correctly nested, with none missing and none overlapping.
The element tags are case-sensitive; the beginning and end tags must match exactly.
There is a single "root" element that contains all the other elements

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Слайд 16

Valid XML Document
Valid = well-formed + semantic-correct
Semantic is described with:
Document Type

Definition (DTD) or
XML Schema definition (XSD)
Contains rules that explain how a document should be formed, by specifying the legal child elements and attributes for each element

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6. Java basic I/O 5. Java and XML

Содержание

Why XML?XML is a very useful technology for describing structured informationXML

XML Example 4.0.0

What is an XML?Extensible Markup Language (XML) is a markup language

The Structure of an XML DocumentAn XML document should start with

XML Example 4.0.0

ElementA logical document component either begins with a start-tag and ends

Element (continued)An element can contain child elements, text, or both: webapp.sample

AttributesA markup construct consisting of a name/value pair that exists within

Parsing an XML DocumentTo process an XML document, you need to

Java XML ParsersTree parser - Document Object Model (DOM) that read

XML namespaceXML namespaces are used for providing uniquely named elements and

Namespace declarationAn XML namespace is declared using the reserved XML attribute

Default NamespaceIt is also possible to declare a default namespace: xmlns="http://www.w3.org/1999/xhtml"In

Well-formed XML documentWell-formed = correct syntaxThe begin, end, and empty-element tags

Valid XML DocumentValid = well-formed + semantic-correctSemantic is described with:Document Type

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Why XML?
XML is a very useful technology for describing structured information
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What is an XML?
Extensible Markup Language (XML) is a markup language

The Structure of an XML Document
An XML document should start with

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Element
A logical document component either begins with a start-tag and ends

Element (continued)
An element can contain child elements, text, or both:

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Parsing an XML Document
To process an XML document, you need to

Java XML Parsers
Tree parser - Document Object Model (DOM) that read

XML namespace
XML namespaces are used for providing uniquely named elements and

Namespace declaration
An XML namespace is declared using the reserved XML attribute

Default Namespace
It is also possible to declare a default namespace:
xmlns="http://www.w3.org/1999/xhtml"
In

Well-formed XML document
Well-formed = correct syntax
The begin, end, and empty-element tags

Valid XML Document
Valid = well-formed + semantic-correct
Semantic is described with:
Document Type