XML Schema best practices









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XML Schema best practices

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215118 XML Schema best practices

XML Schema best practices

By David Stephenson

December 2004

Introduction........................................................................ .................................................................3

Meta requirements for XML schemas........................................................................

..............................3 Schema design best practices........................................................................ .......................................4 Namespaces URI, URL vs. URN........................................................................ ..................................4 Attributes vs. elements........................................................................ ...............................................4 Qualified element names........................................................................ ..........................................5 Qualified attribute names........................................................................ ..........................................5

Global elements vs. local elements........................................................................

.............................5

Named types vs. anonymous types........................................................................

............................6

Extensible content models, wildcards, anyAttribute........................................................................

6

Constraints: max, min, length, pattern, etc.........................................................................

.................7 Graph data structures........................................................................ ...............................................7 Identifiers in XML schemas........................................................................ .........................................8

Default/fixed attributes value and default element values......................................................................8

Versioning........................................................................ ...............................................................8 Mixed content........................................................................ ..........................................................9 Simple type code lists........................................................................ ...............................................9 Complex type code lists........................................................................ ..........................................10 Generic containers........................................................................ .................................................11

Model groups , , and .......................................................................12

DTD........................................................................ ......................................................................12

Extension vs. restriction for complex types........................................................................

.................12

Type hierarchies vs. composition........................................................................

..............................12 Must understand attribute........................................................................ ........................................12 Nil........................................................................ .......................................................................12 Elements with simple content........................................................................ ....................................13 Schema header........................................................................ .....................................................13 Import/include........................................................................ .......................................................13

Supplemental schema constraints........................................................................

.............................13 Summary........................................................................ ..................................................................14

Appendix: rationale behind the best practices........................................................................

...............14

Background reading and alternative rationales........................................................................

..........17 Acknowledgement........................................................................ .....................................................17 About the author........................................................................ ........................................................17 For more information........................................................................ ..................................................18 Call to action........................................................................ ............................................................18

Introduction

The XML Schema language is a complex maze of constructs that overlap each other. Creating an XML schema is hard to get right; creating several interlocking schemas which can be extended and versioned is even harder. This document provides you with a map that allows you to navigate the maze with confidence.

XML Schema best practices

By David Stephenson

December 2004

Introduction........................................................................ .................................................................3

Meta requirements for XML schemas........................................................................

..............................3 Schema design best practices........................................................................ .......................................4 Namespaces URI, URL vs. URN........................................................................ ..................................4 Attributes vs. elements........................................................................ ...............................................4 Qualified element names........................................................................ ..........................................5 Qualified attribute names........................................................................ ..........................................5

Global elements vs. local elements........................................................................

.............................5

Named types vs. anonymous types........................................................................

............................6

Extensible content models, wildcards, anyAttribute........................................................................

6

Constraints: max, min, length, pattern, etc.........................................................................

.................7 Graph data structures........................................................................ ...............................................7 Identifiers in XML schemas........................................................................ .........................................8

Default/fixed attributes value and default element values......................................................................8

Versioning........................................................................ ...............................................................8 Mixed content........................................................................ ..........................................................9 Simple type code lists........................................................................ ...............................................9 Complex type code lists........................................................................ ..........................................10 Generic containers........................................................................ .................................................11

Model groups , , and .......................................................................12

DTD........................................................................ ......................................................................12

Extension vs. restriction for complex types........................................................................

.................12

Type hierarchies vs. composition........................................................................

..............................12 Must understand attribute........................................................................ ........................................12 Nil........................................................................ .......................................................................12 Elements with simple content........................................................................ ....................................13 Schema header........................................................................ .....................................................13 Import/include........................................................................ .......................................................13

Supplemental schema constraints........................................................................

.............................13 Summary........................................................................ ..................................................................14

Appendix: rationale behind the best practices........................................................................

...............14

Background reading and alternative rationales........................................................................

..........17 Acknowledgement........................................................................ .....................................................17 About the author........................................................................ ........................................................17 For more information........................................................................ ..................................................18 Call to action........................................................................ ............................................................18

Introduction

The XML Schema language is a complex maze of constructs that overlap each other. Creating an XML schema is hard to get right; creating several interlocking schemas which can be extended and versioned is even harder. This document provides you with a map that allows you to navigate the maze with confidence.
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