LBSC 670 Organization of Information

Review Metadata models Dublin Core Metadata Standards Dublin core, MARC Encoding Schemes HTML, XML, MARC… Advanced metadata concepts Schemas, application profiles

Questions? INLS 520 – Fall 2007 Erik Mitchell

INLS 520 – Fall 2007 Erik Mitchell Today Guest speakers: –Metadata and information organization in digital libraries eXtensible Stylesheet Language: –Learning the nuts and bolts of metadata transformation

Guest Speakers Jennine Kneiss Thomas Whittaker INLS 520 – Fall 2007 Erik Mitchell

Anatomy of a Digital Library Interfaces Services Metadata store Digital object store Discovery Administration Create Replace Update Delete Index XML files Relational database Object database File system File management application

Connecting structure and style CSS XHTML Semantics & structure Design & interactivity XSL Decision making

Programming 101 Definition: –The process of developing a step-by-step schematic for address a specific task –The process of organizing these steps using a specific encoding system –The manipulation of data to serve a specific information need

Compiled Vs Scripting

Definitions Programming Language “A formal language used to write instructions that can be translated into machine language and then executed by a computer.” (definitions)definitions Scripting Language Run-time (does not require compilation) Restricted context (requires a specific environment) Functional / Object oriented Definitions Compiler / Interpreter A program that builds and executes a program. Compilers create a self-executable file, interpreters read a text script at run-time

The programming process Analyze the problem What do you want your program to do? What are your users expecting, what data do you have? Plan program flow/logic What steps need to occur, in what order? Useful tools include Step-Form, flowcharts, and pseudocodeflowcharts Code the program Create variables, routines, functions Compile/run the program Test, verify Release

eXtensible Stylesheets eXtensible Style Language (XSL) is a metadata schema that is encoded using XML and interpreted by Web-Browsers. The primary function of XSL is to transform XML documents. The XSL language features a set of programming constructs that support this function

XSL Sample <xsl:stylesheet version="1.0" xmlns:xsl=" form"> Processing Instructions

Contents of Sample XSL transformation :

XSL – Sample Stylesheet

XML RSS Record Sample RSS File This is a sample en-us Tue, 10 Jun :00:00 GMT …

WorkTime! Get into groups and work through our XSL worksheet. Ask questions Pause for discussion

XSL Control Structures For Each Choosing between options – If

XPath A DOM-style syntax that allows us to access elements in an XML file Examples –/dublinCore/title –Access the title of a DC record –Access an attribute of the subject element –/dublinCore/

Xpath (2) Xpath functions –Contains (//item/title, ‘England’) –substring-before(string1, string2), substring- after(string1, string2) Xpath selectors –//elementname – finds an element anywhere in the DOM –./ - from the current context –/ - from the root context –* - wildcard match

Wrap-up Questions about Assignment 2? Next week – Classification! Course feedback: –