XML - Duke University
XML
Introduction to Databases CompSci 316 Spring 2020
2
Updates
? HW5 problems on gradescope and gradiance ? (One) more coming on XML
? There may be an extra credit problem
? Let us know if you have problems in collaboration for project/HW or accessing material
? Video-watch assignments to be submitted by ALL (2 days after lecture + 2 bonus days)
3
Lecture 11a: XML Basics
4
Structured vs. unstructured data
? Relational databases are highly structured
? All data resides in tables ? You must define schema before entering any data ? Every row confirms to the table schema ? Changing the schema is hard and may break many things
? Texts are highly unstructured
? Data is free-form ? There is no pre-defined schema, and it's hard to
define any schema ? Readers need to infer structures and meanings
What's in between these two extremes?
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