LIS 549 U/TU: Intro to Content Management Fall 2003 * Bob Boiko * MSIM Associate Chair

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LIS 549 U/TU: Intro to Content ManagementFall 2003 * Bob Boiko * MSIM Associate Chair

XML Basics

LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

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A First Look at XML

1. You invent a set of names for the stuff you want to manage and put <> around them

– <MyInfo>

– <Title>

– <Author>

– <Body>

– <Para>

2. You figure out which ones go inside witch others

• <MyInfo>• <Title>• <Author>• <body>

• <Para>

• </Body• </MyInfo>

3. You add additional information to the names

• <MyInfo Date=“”>• <Title>• <Author eMail = “”>• <Body Revision=“”>

• <Para Style=“”>

• </Body>

• </MyInfo>

4. You fill in the blanks• <MyInfo Date=“2004-03-03”>

• <Title>My Title</Title>• <Author eMail = “[email protected]”>Bob</Author>• <Body Revision=“2”>

• <Para Style=“ListHead”>Some Head</Para>• <Para Style=“List”>Point 1</Para>• <Para Style=“List”>Point 2</Para>

• </Body>

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Data- Transfer

Resource identification and discovery (Dublin core, RDF, etc.)Content modeling


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Why XML is Cool

• Has an X in its name!

• Is as strong as it’s “also ran” parent SGML

• More flexible than it’s superficial cousin HTML

• It’s accepted


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What is XML Good For?

You can treat and XML file like:

• A word processing file– Type it, edit it, display it

• An HTML file– Tag it, display it with a style sheet

• A database– Open it. Search it, add, update, delete


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XML vs. Other Markup Languages

HTML XML WP Markup

ASCII vs. Binary

ASCII ASCII Binary

Format vs. Structure

Format Struct Format and Structure

Extendable vs. Non Extendable

Non Ext Ext Non Ext

Range of coverage

Low High Medium


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How do you Write XML?


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Three Views of XMLSchematic View

Tag View

Browser View


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XML Instance DocumentsNo TaggingDodge DurangoSport Utility432000 miles$18000YesYesRadio/Cassette/CDYesYesFull/PartialVery clean

Minimal TaggingName: Dodge DurangoType: Sport UtilityDoors: 4Miles: 32000Price: 18000Power_Locks: YesPower_Windows: YesStereo: Radio/Cassette/CDAir-Conditioning: YesAutomatic: YesFWD: Full/PartialNote: Very clean

XML Tagging<VEHICLES> <VEHICLE inventory_number="1"> <MAKE>Dodge</MAKE> <MODEL model_code="USA23">Durango</MODEL> <YEAR>1998</YEAR> <STYLE>Sport Utility</STYLE> <DOORS>4</DOORS> <PRICE>18000</PRICE> <MILES>32000</MILES> <OPTIONS> <POWER_LOCKS>Yes</POWER_LOCKS> <POWER_WINDOWS>Yes</POWER_WINDOWS> <STEREO>Radio/Cassette/CD</STEREO> <AIR_CONDITIONING>Yes</AIR-_CONDITIONING> <AUTOMATIC>Yes</AUTOMATIC> <FWD>Full/Partial</FWD> </OPTIONS> <NOTE>Very clean</NOTE> </VEHICLE></VEHICLES>


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The Gross Anatomy of a Tag


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The Micro Anatomy of a Tag

• Shorthand tag names stand for real words.

• Every tag "inside" is contained by that tag.

• Parameters tell you what the tag has.

White Space is for Your Eyes Only

<TABLE><TR><TD COLSPAN="2">Here is the picture<IMG SRC="ngo.jpg" BORDER

="1"> </TD> </TR><TABLE>


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The Element

• The thing in brackets– <CapitalizationMatters/>– <NoSpaces/>– <StartWithALetter/>– <BeDescriptive/>– <Nest>

• <Nest>– <Nest/>

• </Nest>

– </Nest>


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The Attribute

• Really just another form of an element

• Always quote them

• A variety of data types

• Can be linked to a list of values

• Cannot nest


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How to Approach an Instance

• Understand it is an instance of a model– Model of what?– From what perspective?

• What are the names– What are the biggies?– Which ones to ignore for now– How is capitalization handled?

• Strip it to know it– Get rid of the bulk.– Lay out the major structure


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Finding Stuff in an XML File - Xpath

• Directories are hierarchies– Each file has a

path

• XML files are hierarchies– Each element has

an Xpath

• /Subject• //Subject• //Subject[@id=‘s0’]• //*[@id=‘s0’]• //*[@id=‘s0’]/title

LIS 549 U/TU: Intro to Content Management Fall 2003 * Bob Boiko * MSIM Associate Chair

Documents

Transcript of LIS 549 U/TU: Intro to Content Management Fall 2003 * Bob Boiko * MSIM Associate Chair