REVISED: Sunday, March 3, 2013
You will learn the fundamentals of XML Schema.
I. INTRODUCTION TO XML SCHEMA (XSD)
XML Schemas are themselves XML documents. XML Schemas provide an "Object Oriented" approach to defining the format of an XML document.
XML Schemas provide us with a way to give content specific specifications to our XML data.
Validating XML Parser checks to see if the data specifications are met.
Like "Document Type Definitions" (DTD's) XML Schema can specify elements, attributes, nesting, ordering, and #occurrences.
In addition we can specify data types, keys, (typed) pointers, and much more.
XSD is written in XML.
XSD's are in a separate file.
We work with a data file and a Schema file.
Four things in Schema are not present in DTD's:
1. Typed values.
2. Key declarations.
3. References.
4. Occurrence constraints.
Validating XML Parser checks to see if the data specifications are met.
Like "Document Type Definitions" (DTD's) XML Schema can specify elements, attributes, nesting, ordering, and #occurrences.
In addition we can specify data types, keys, (typed) pointers, and much more.
XSD is written in XML.
XSD's are in a separate file.
We work with a data file and a Schema file.
Four things in Schema are not present in DTD's:
1. Typed values.
2. Key declarations.
3. References.
4. Occurrence constraints.
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