XML (eXtensible Markup Language) 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 used to store and transport data. The document discusses XML, comparing it to HTML and SGML. It also covers XML parsers, schemas, namespaces, XSLT, and other XML concepts in detail.
Data interchange integration, HTML XML Biological XML DTDAnushaMahmood
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XML Introduction,Syntax of XML,Well formed XML Documents,XML Document Structure,Document Type Definitions,XML Namespace,XML Schemas,DOM(Document Object Model)
By now, you have heard how important structured content is. But, maybe you poked around with something like DITA and were baffled by the complexity. Or, maybe you still aren’t sure what XSLT stands for. This workshop will take participants back to the basics, to provide a foundation for higher-level concepts that have taken hold of our industry. Topics will include:
- What XML looks like, what it does, and how to create it.
- How to define a structure model, including whether to use a - DTD, Schema, etc.
- What XSLT looks like, what it does, and how to make it work.
- What DITA and DocBook really are and whether one is right for you.
Russell Ward is an experienced technical writer and structured technologies developer. He has spent many years working with structured content to maximize efficiency in the techcomm environment, both as an employee and as an independent consultant. He is also an experienced trainer and speaks periodically at conferences and other peer events.
The eXtensible Markup Language (XML) is not a language itself, but rather a meta-language used to create markup languages to suit whatever purpose you may have. In this session you will learn the basic rules of XML and the philosophy behind it. You will also be introduced to the basics of the popular XML editor, oxygen.
Data interchange integration, HTML XML Biological XML DTDAnushaMahmood
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XML Introduction,Syntax of XML,Well formed XML Documents,XML Document Structure,Document Type Definitions,XML Namespace,XML Schemas,DOM(Document Object Model)
By now, you have heard how important structured content is. But, maybe you poked around with something like DITA and were baffled by the complexity. Or, maybe you still aren’t sure what XSLT stands for. This workshop will take participants back to the basics, to provide a foundation for higher-level concepts that have taken hold of our industry. Topics will include:
- What XML looks like, what it does, and how to create it.
- How to define a structure model, including whether to use a - DTD, Schema, etc.
- What XSLT looks like, what it does, and how to make it work.
- What DITA and DocBook really are and whether one is right for you.
Russell Ward is an experienced technical writer and structured technologies developer. He has spent many years working with structured content to maximize efficiency in the techcomm environment, both as an employee and as an independent consultant. He is also an experienced trainer and speaks periodically at conferences and other peer events.
The eXtensible Markup Language (XML) is not a language itself, but rather a meta-language used to create markup languages to suit whatever purpose you may have. In this session you will learn the basic rules of XML and the philosophy behind it. You will also be introduced to the basics of the popular XML editor, oxygen.
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2. Extensible Markup Language
• Introduction
• SGML is a meta-markup language is a language for defining markup language it
can describe a wide variety of document types.
• Developed in the early 1980s; In 1986 SGML was approved by ISO std.
• HTML was developed using SGML in the early 1990s - specifically for Web
documents.
• Two problems with HTML:
• 1. HTML is defined to describe the general form and layout of information without
considering its meaning.
• 2. Fixed set of tags and attributes. Given tags must fit every kind of document. No
way to find particular information
• 3. There are no restrictions on arrangement or order of tag appearance in
document.
3. What is XML
• XML stands for eXtensible Markup Language.
• A markup language is used to provide information about a
document.
• Tags are added to the document to provide the extra
information.
• XML was designed to describe data, not to display data
• XML tags are not predefined. You must define your own tags
• HTML tags tell a browser how to display the document.
• XML tags give a reader some idea what some of the data
means.
4. What is XML Used For?
• XML documents are used to transfer data from one
place to another often over the Internet.
• XML subsets are designed for particular applications.
• A number of fields have their own subsets. These
include chemistry, mathematics, and books publishing.
• Most of these subsets are registered with the
W3Consortium and are available for anyone’s use.
5. How Can XML be Used?
• If you need to display dynamic data in your HTML document, it
will take a lot of work to edit the HTML each time the data
changes.
• With XML, data can be stored in separate XML files. This way
you can concentrate on using HTML/CSS for display and
layout, and be sure that changes in the underlying data will not
require any changes to the HTML.
• With a few lines of JavaScript code, you can read an external
XML file and update the data content of your web page.
6. Advantages of XML
• XML is text (Unicode) based.
– Takes up less space.
– Can be transmitted efficiently.
• XML documents can be modularized. Parts can
be reused.
7. Example of an HTML Document
<html>
<head><title>Example</title></head.
<body>
<h1>This is an example of a page.</h1>
<h2>Some information goes here.</h2>
</body>
</html>
8. Example of an XML Document
<?xml version=“1.0”/>
<address>
<name>Alice Lee</name>
<email>alee@aol.com</email>
<phone>212-346-1234</phone>
<birthday>1985-03-22</birthday>
</address>
9. Difference Between HTML and XML
• HTML tags have a fixed meaning and
browsers know what it is.
• XML tags are different for different
applications, and users know what they
mean.
• HTML tags are used for display.
• XML tags are used to describe documents
and data.
10. XML Rules
• Tags are enclosed in angle brackets.
• Tags come in pairs with start-tags and
end-tags.
• Tags must be properly nested.
– <name><email>…</name></email> is not allowed.
– <name><email>…</email><name> is.
• Tags that do not have end-tags must be
terminated by a ‘/’.
– <br /> is an html example.
11. More XML Rules
• Tags are case sensitive.
– <address> is not the same as <Address>
• XML in any combination of cases is not allowed
as part of a tag.
• Tags may not contain ‘<‘ or ‘&’.
• Tags follow Java naming conventions, except
that a single colon and other characters are
allowed. They must begin with a letter and may
not contain white space.
• Documents must have a single root tag that
begins the document.
12. Encoding
• XML (like Java) uses Unicode to encode characters.
• Unicode comes in many flavors. The most common one
used in the West is UTF-8.
• UTF-8 is a variable length code. Characters are
encoded in 1 byte, 2 bytes, or 4 bytes.
• The first 128 characters in Unicode are ASCII.
• In UTF-8, the numbers between 128 and 255 code for
some of the more common characters used in western
Europe, such as ã, á, å, or ç.
13. Well-Formed Documents
• An XML document is said to be well-formed if it
follows all the rules.
• An XML parser is used to check that all the rules
have been obeyed.
• Recent browsers such as Internet Explorer 5
and Netscape 7 come with XML parsers.
• Parsers are also available for free download
over the Internet.
• Java 1.4 also supports an open-source parser.
14. XML Example Revisited
<?xml version=“1.0”/>
<address>
<name>Alice Lee</name>
<email>alee@aol.com</email>
<phone>212-346-1234</phone>
<birthday>1985-03-22</birthday>
</address>
• Markup for the data helps understanding of its purpose.
• A flat text file is not nearly so clear.
Alice Lee
alee@aol.com
212-346-1234
1985-03-22
• The last line looks like a date, but what is it for?
16. XML Files are Trees
address
name email phone birthday
first last year month day
17. XML Trees
• An XML document has a single root node.
• The tree is a general ordered tree.
– A parent node may have any number of
children.
– Child nodes are ordered, and may have
siblings.
18. Validity
• A well-formed document has a tree structure and
obeys all the XML rules.
• A particular application may add more rules in
either a DTD (document type definition) or in a
schema.
• Many specialized DTDs and schemas have
been created to describe particular areas.
• These range from disseminating news bulletins
to chemical formulas.
• DTDs were developed first, so they are not as
comprehensive as schema.
19. Document Type Definitions
• A DTD describes the tree structure of a
document and something about its data.
• There are two data types, PCDATA and
CDATA.
– PCDATA is parsed character data.
– CDATA is character data, not usually parsed.
• A DTD determines how many times a
node may appear, and how child nodes
are ordered.
20. Parsing
• Breaking a data block into smaller chunks by following a set
of rules, so that it can be more easily interpreted, managed, or
transmitted by a computer. Spreadsheet programs, for
example, parse a data to fit it into a cell of certain size.
21. Document Type Definitions
• The form of an element declaration for
elements that contain elements
• <!ELEMENT element_name(list of names of child elements)>
• The form of an Attribute declaration
• <!ATTLIST element_name attribute_name
attribute_type[default_value]>
• Ex.<!ATTLIST airplane places CDATA “4”>
22. DTD for address Example
<!ELEMENT address (name, email, phone, birthday)>
<!ELEMENT name (first, last)>
<!ELEMENT first (#PCDATA)>
<!ELEMENT last (#PCDATA)>
<!ELEMENT email (#PCDATA)>
<!ELEMENT phone (#PCDATA)>
<!ELEMENT birthday (year, month, day)>
<!ELEMENT year (#PCDATA)>
<!ELEMENT month (#PCDATA)>
<!ELEMENT day (#PCDATA)>
23. INTERNAL AND EXTERNAL DTDs
• Internal DTD Example:
• External DTD Example: [assuming that the DTD
is stored in the file named planes.dtd]
<!DOCTYPE planes_for_sale SYSTEM “planes.dtd”>
24. NAMESPACES
• It is often convenient to construct XML documents that include
tag sets that are defined for and used by other documents.
• When a tag set is available and appropriate for particular XML
document, it is better to use it rather than to invent new
collection of element types.
• problem with using different markup vocabularies in the same
document is that collisions between names that are defined in
two or more of those tag sets could result.
• An example of this situation is having a <table> tag for a
category of furniture and a <table> tag from XHTML for
information tables.
25. NAMESPACES
• An XML namespace is a collection of element and attribute
names used in XML documents. The name of a namespace
usually has the form of a uniform resource identifier (URI).
• The form of a namespace declaration for an element is
• <element_name xmlns[:prefix] = URI>
• The square brackets indicate that what is within them is
optional. The prefix, if included, is the name that must be
attached to the names in the declared namespace.
• <html xmlns = “http://www.w3.org/1999/xhtml”>
26. NAMESPACES
• The next example declares two namespaces. The first is
declared to be the default namespace; the second defines the
prefix, cap:
27. XML SCHEMAS
• XML schemas is similar to DTD i.e. schemas are used to
define the structure of the document
• DTDs had several disadvantages:
• The syntax of the DTD was un-related to XML, therefore they
cannot be analyzed with an XML processor
• It was very difficult for the programmers to deal with 2
different types of syntaxes
• DTDs does not support the datatype of content of the tag. All
of them are specified as text
28. Schemas
• Schemas are themselves XML documents.
• They were standardized after DTDs and provide
more information about the document.
• They have a number of data types including
string, decimal, integer, boolean, date, and time.
• They divide elements into simple and complex
types.
• They also determine the tree structure and how
many children a node may have.
29. DEFINING A SCHEMA
• Schemas themselves are written with the use of a collection of
tags, from a namespace that is, in effect, a schema of
schemas.
• The name of this namespace is
http://www.w3.org/2001/XMLSchema.
• Every schema has schema as its root element. This
namespace specification appears as follows:
• xmlns:xsd = “http://www.w3.org/2001/XMLSchema”
• The name of the namespace defined by a schema must be
specified with the targetNamespace attribute of the schema
element.
– targetNamespace = “http://cs.uccs.edu/planeSchema”
31. DEFINING A SCHEMA INSTANCE
• An instance document normally defines its default namespace to be the one
defined in its schema.
• for example, if the root element is planes, we could have
<planes xmlns = “http://cs.uccs.edu/planeSchema” ... >
• The second attribute specification in the root element of an instance
document is for the schemaLocation attribute. This attribute is used to name
the standard namespace for instances, which includes the name
XMLSchema-instance.
xmlns:xsi = http://www.w3.org/2001/XMLSchema-instance
• Third, the instance document must specify the filename of the schema in
which the default namespace is defined. This is accomplished with the
schemaLocation attribute, which takes two values: the namespace of the
schema and the filename of the schema.
33. Explanation of Example Schema
<?xml version="1.0" encoding="ISO-8859-1" ?>
• ISO-8859-1, Latin-1, is the same as UTF-8 in the first 128 characters.
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
• www.w3.org/2001/XMLSchema contains the schema standards.
<xs:element name="address">
<xs:complexType>
• This states that address is a complex type element.
<xs:sequence>
• This states that the following elements form a sequence and must
come in the order shown.
<xs:element name="name" type="xs:string"/>
• This says that the element, name, must be a string.
<xs:element name="birthday" type="xs:date"/>
• This states that the element, birthday, is a date. Dates are always of
the form yyyy-mm-dd.
34. XSLT
• XSL = Style Sheets for XML
• XML does not use predefined tags (we can use any
tag-names we like), and therefore the meaning of
each tag is not well understood.
• A <table> tag could mean an HTML table, a piece of
furniture, or something else - and a browser does
not know how to display it.
• XSL describes how the XML document should be
displayed!
35. XSLT
• The eXtensible Stylesheet Language (XSL) is a family of
recommendations for defining the presentation and
transformations of XML documents.
• It consists of three related standards:
– XSL Transformations (XSLT),
– XML Path Language (XPath), and
– XSL Formatting Objects (XSL-FO).
• XSLT is used to transform one xml document into another,
often an html document.
• A program is used that takes as input one xml document and
produces as output another.
• If the resulting document is in html, it can be viewed by a web
browser.
• This is a good way to display xml data.
36. XSLT
• XPath is a language for expressions, which are often used to
identify parts of XML documents.
• such as specific elements that are in specific positions in the
document or elements that have particular attribute values.
37. OVERVIEW OF XSLT
• XSLT processors take both an XML document and an
XSLT document as input.
• the XSLT document is the program to be executed; the
XML document is the input data to the program.
• An XSLT document consists primarily
of one or more templates.
• One XSLT model of processing XML
data is called the template-driven model
• l
40. The Result of the Transformation
Alice Lee
alee@aol.com
123-45-6789
1983-7-15
41. Parsers
• There are two principal models for
parsers.
• SAX – Simple API for XML
– Uses a call-back method
– Similar to javax listeners
• DOM – Document Object Model
– Creates a parse tree
– Requires a tree traversal