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

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

2. Instance documents • Are they too much? • Why would I bother to do all that work just to create a Web page that I could have typed in? • Are they enough? How about: • Making new instances • Keeping control over the tags and their and use • Making sure others know how to create the instance • Using parts of other people’s instances • Adding format to the XML LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

3. Enter Schemas • The schema contains all the rules • What elements are allowed • What elements within what elements • What attributes • What attribute values • Well formed vs. valid • Namespaces • Document Type Definitions (DTD) LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

4. What are Schemas? • They are XML! • They are rules and regulations • They are MODELS LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

5. What are the Major Players? • Text ora visual design environment • Elements • Attributes • Nesting • Reuse LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

6. Schema overview • Elements • Required vs. Optional • Bounded vs. unbounded • Mixed (allows text) vs. elements only • Reference vs. locally defined • Attributes • Required vs. Optional • Type • Allowed values • Nesting • Sequence • Choice • Reuse • Element Groups • Block elements (my term) • Inline elements (my term) LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

7. Navigator Element properties Attribute properties Element Hierarchy The Spy visual environment LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

8. A quick look at schema text LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

9. Mixed (allows text) vs. elements only Required vs. Optional Bounded vs. unbounded Reference vs. locally defined Elements LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

10. Only Text Allowed Text and Elements Allowed Only Elements Allowed Text in Elements LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

11. Allowed number (Cardinality) LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

12. Allowed values Required vs. Optional Group Type Attributes • ID and IDREF • An ID is a unique value (starting with a character) • An IDREF is a reference to the ID of an other element • You use them for the same reason you always use Id’s LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

13. Choice (optional, unbounded) Sequence (required) Nesting LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

14. Group name My block and inline model LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

15. Back to content modeling What do you have to figure out? • What is it called? • What does it contain? • How many? How do you encode it? • Root element • Child elements • Child attributes LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair

16. Forward from a content model • Figure out what parts of your information need to be named • Figure out what metadata you need to attach to your information • Descriptive • Management • Access • Build a system that lets you gather, tag and distribute your information LIS 549 U/TU: Intro to Content Management * Fall 2004 * Bob Boiko * MSIM Associate Chair