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Sybase XML manual Defining identity constraints, Defining a unique constraint

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Defining identity constraints

Defining identity constraints

Identity constraints enable you to indicate that element values must be unique within their specified scope.

There are three kinds of identity constraints: unique, key and keyRef.

Each identity constraint has two specific attributes: selector and field.

In a schema, an identity constraint is declared with its corresponding tag: <unique>, <key> or <keyRef>.

Identity constraints are only available in a model targeted with XSD.

Defining a unique constraint

A unique constraint specifies that an element or an attribute value (or set of values) must be unique or null within a specified scope.

For example:

Generated schema:

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Sybase XML manual Defining identity constraints, Defining a unique constraint

Contents

Sybase PowerDesigner 11.1Last Revised June Contents Managing external shortcuts through references and data 100101 102Working with an XML model 139 Why reverse engineer an XSD, a DTD or an XDR How to reverse engineer an XSD, a DTD or an XDR169 Mapping XML Model objects to OOM objects 171Exchanging data with databases supporting XML 215 ViiViii Audience SubjectDocumentation primer Conceptual Data Model User’s Guide To work with the CDM Physical Data Model User’s GuideObject Oriented Model Getting Started Business Process Model User’s GuideBeforeInsertTrigger template Typographic conventions BibliographyXii Contents XML Model BasicsFunctional overview What is an XML model? Demo modelsAbout XML Objects in an XML model Tool Object Description XSDObjects in a diagram Tool Element symbol Group symbol Complex type symbol Tool Sequence symbol Choice symbol All symbolAll Choosing the XML language of an XML model Defining the XML model environmentNot certified resource file ™ To change the XML language of an XML model Changing the XML language of an XML modelLanguage Description Changes concerning simple and complex types Selecting extended model definitions at model creation Option DescriptionDefining model options XML model extended dependencies ™ To define XML model optionsDefining the XML model environment Defining model properties Defining an XML model™ To define the properties of an XML model Model General Property DescriptionModel Detail Button Moves item Model ItemsTool Tooltip Description Model External Schemas Model Namespaces XML Model Basics Creating an XML model Model PreviewCreating an XML model using the New model option ™ To create a new XML model using the New model optionDefining an XML model List of templates Opening an existing XML model Detaching an XML model from the workspace™ To open an existing XML model ™ To detach an XML model from a workspaceSaving and closing an XML model Saving an XMLModel Closing an XML modelDefining an XML model Building an XML model XML diagram basics Defining an XML diagramWhy build an XML diagram? Group Symbols feature Creating an XML diagramExpand/Expand All/Collapse/Arrange Symbols features Defining elements Defining element properties Element general properties Global and local elements in XDR filesDefining elements XDR files Property orElement detail properties Element attributes properties Building an XML modelElement mapping properties Element constraints propertiesElement Sources Attributes Mapping Creating an element™ To create an element from the palette Defining elements How to link a child object to an element? Tool Action ResultDefining the attributes of an element Pointer indicationsBuilding an XML model Attribute general properties Global and local attributes in XDR filesDefining attributes Attribute detail properties Attribute valuesElement values with XDR Adding an attribute to an element™ To add an attribute to an element Linking child elements to a parent element Modifying element display preferencesPreference Description Group particles Defining group particlesGroup particle Value of the order attribute in XDR Group particles properties Items listCreating a group particle ™ To create a group particle from an element property sheetName and code uniqueness From the paletteHow to link a child object to a group particle? Clicking an element symbol with the Element toolDefining Any properties Any general properties ™ To create an Any Modifying the Any display preference Defining Any Attribute propertiesFor example Any Attribute general properties Defining identity constraints Defining a unique constraintUnique general properties Unique fields propertiesDefining a key constraint Key general properties Defining a keyRef constraintKey fields properties Defining identity constraints KeyRef general properties Creating an identity constraintKeyRef fields properties Defining an identity constraint selector XPath abbreviated syntax Syntax DescriptionDefining selector general properties ™ To display a selector property sheetDefining an identity constraint field Defining field general properties ™ To create an identity constraint fieldBuilding an XML model Defining groups Defining a group of elementsDefining group properties Groups in DTD and XDR files Creating a group of elements ™ To create a group of elements from the paletteDefining groups How to link a child object to a group of elements? Modifying the group display preference Defining a group of attributesDefining attribute group properties Attribute group general propertiesAttributes Attribute groupProperties Creating an attribute group ™ To create an attribute group from the Browser tree viewDefining groups References Data typesExample of shortcuts through a reference and a data type Defining simple types What is a simple type?Type of derivation Description Defining simple type properties Modifying the simple type display preferenceCreating a simple type ™ To create a simple type from the Browser tree viewBuilding an XML model What is a complex type? Defining complex typesDefining complex type properties Complex type general propertiesComplex type detail properties Complex type attributes propertiesComplex type mapping properties Complex TypeSources Icon Tool DescriptionModifying complex type display preferences Creating a complex type™ To create a complex type from the palette How to link a child object to a complex type? Pointer indications Defining simple content properties Simple content™ To create a simple content General propertyDefining complex content properties Complex content™ To create a complex content General propertiesDefining derivations Deriving by extensionDerivation in element property sheet 102™ To define a derivation by extension Defining extension103 Restriction on a simple type Deriving by restriction104 Defining restriction facets Restriction generalRestriction detail 105Facet general RestrictionEnumerations 106Restriction patterns 107™ To create a restriction on a simple type Creating a restriction on a simple type108 109 110 Restriction on a complex type Enumeration and Pattern facets™ To create a restriction on a complex type 111Deriving by list 112™ To define a simple type derivation by list Deriving by union113 Union general Union types™ To define a simple type derivation by union 114Defining annotations 115Defining annotation properties Defining documentation propertiesAnnotation general property Annotation items propertiesDocumentation content Defining application information propertiesDocumentation general properties Application information general propertiesCreating an annotation Application information content118 119 Defining notation properties Defining notations120 ™ To create a notation from the Browser tree view Creating a notation121 Defining entities Defining entity properties122 Entity name Reference Value™ To create an entity from the Browser tree view Creating an entity123 124 Defining import, include and redefine Defining an importDefining import properties Import general™ To create an import from the Browser tree view Creating an import126 Defining an include Defining include propertiesInclude general 127Defining a redefine Creating an include™ To create an include from the Browser tree view 128Redefine general Defining redefine properties129 Creating a redefine Redefine items™ To create a redefine from the Browser tree view 130131 What is a business rule? Defining business rulesDefining business rule properties Business rule general propertiesCreating a business rule Business rule expression property133 Type Description Example™ To create a business rule from the List of Business Rules 134Applying a business rule to an XML object 135™ To apply a business rule to an XML object 136Column in the List of business rules 137138 Working with an XML model 139Levels of problem severity Checking an XML modelXML model check options 140Selecting objects in the diagram XML model object selection in the Check ModelAutomatic correction 141™ To check an XML model Checking an XML model142 Selecting all or clearing all check boxes 143™ To display errors and warnings selected in the last check Displaying previously applied check options in an XML modelDockable result window 144Making corrections based on XML model check results Display the Check toolbarContextual menu 145Making manual corrections to an XML model Making automatic corrections to an XML model™ To make manual corrections to an XML model ™ To make automatic corrections to an XML modelXML Model objects verified by Check Model Group particle checkExistence of particle Invalid cardinalityModel check Identifier uniquenessUndefined identifier Shortcut code uniquenessBusiness rule check in an XSM Data source checkMissing namespaces Business rule name and code uniquenessFile check Data source name and code uniquenessExistence of model 150Entity check Embedded file name uniquenessExistence of external file location Entity name and code uniquenessSimple type check Include checkComplex type check Element check Existence of attributeElement name and code uniqueness Undefined typeUndefined reference 154Group name and code uniqueness Group check155 Attribute check Notation checkAttribute name and code uniqueness 156Attribute group check Notation name and code uniquenessUndefined notation Attribute group name and code uniquenessUndefined schema location and namespace Import checkRedefine check Existence of attributesKey check Existence of componentKey name and code uniqueness Existence of fieldsKeyRef name and code uniqueness KeyRef check160 Unique name and code uniqueness Unique check161 Extended object check Extended link checkExtended object name and code uniqueness Extended link name and code uniquenessReplication check Extension checkRestriction check Partial object replicationExistence of facet Simple type list check164 Simple type union check Annotation checkExistence of items 165Mapping objects in an XML model Understanding object mappingDefining data sources in an XML model 166Data source properties in an XML model Creating a data source in an XML model™ To create a data source in an XML model 167168 Mapping XML Model objects to PDM objects Mapping elements169 XML Model object PDM object170 Mapping complex typesTool Description 171 Mapping XML Model objects to OOM objectsXML Model object OOM object ™ To create a mapping for an element Creating a mapping for an XML object172 173 Create From Sources and Generate Mapping tools 174™ To modify the mapping of an attribute Modifying the mapping of an attribute175 Manipulating XML objects graphically Local objectsMove 176Global objects Example converting a local object into a global object™ To convert a local object into a global object Drag and dropAfter conversions 178Comparing and merging XML models 179Generating an XML model from a Physical Data Model Generating XML Model objects180 PDM object Generated object in an XML modelGenerating and updating an XML model XML model naming conventionsGenerate new XML 181Update existing Defining XML model generation optionsXML model Clearing the Preserve modifications check boxCheck model before generation 183™ To generate a new XML model from a PDM Generating a new XML model from a PDM184 Updating an existing XML model Generating an XML model from a package185 Preserve modifications ResultPreserve modifications ™ To update an existing XML model by generating from a PDM186 Merging models 187188 Generating an XML model from an Object- Oriented ModelOOM Object Generated object in an XML model 189 190 191 ™ To generate a new XML model from an OOM Generating a new XML model from an OOM192 193 ™ To update an existing XML model by generating from an OOM 194195 What is a report? Editing an XML model reportCreating an XML model report ™ To create a model report197 Language in a template Inserting diagram198 199 200 201 Why generate an XSD file? Why generate a DTD file?Why generate an XDR file? Generating an XSD, a DTD or an XDR fileDefining generation parameters Check modelDefining generation targets 203Using the Move up or down arrows Defining generation optionsDefining generation tasks 204How to generate an XSD, a DTD or an XDR file? Parameter entities during DTD generation205 Model targeted with Generated file206 207 What is reverse engineering? Why reverse engineer an XSD, a DTD or an XDR file?How to reverse engineer an XSD, a DTD or an XDR file? Reverse engineering an XSD, a DTD or an XDR fileReverse engineering options Reverse engineering target modelsReverse engineering to a new XML model Convert Unique References210 211 Reverse engineering to an existing XML model 212Auto-layout 213214 Exchanging data with databases supporting XML 215Why use XML in databases? 216Mapping XML objects to PDM objects Generating an annotated schema for Microsoft SQL Server217 218 219 220 221 Extended model definitions 222Annotated schema preview 223224 Reinforcing mapping with extended attributes 225226 Annotation Description227 228 229 ™ To generate an annotated schema for Oracle Generating an annotated schema for Oracle230 231 232 233 234 235 236 Generating a DAD file for IBM DB2 ™ To generate a DAD file for IBM DB2237 Type of storage Type of mapping DescriptionGenerating a DAD file for IBM DB2 238239 240 241 242 DAD file preview 243244 Extended attribute Description245 246 247 248 ™ To generate SQL/XML queries Generating SQL/XML queries249 Generating SQL/XML queries 250251 252 253 254 Generating from an XML model 255Generation basics Target models parameters256 Generation option DescriptionGenerating from an XML model 257258 Generating an XML model from an XML model Why generate an XML model from an XML model?259 Generating an XML model from an XML model 260Generating a new XML model from an XML model 261™ To generate a new XML model from an XML model 262Updating an existing XML model 263264 265 266 267 268 XSM User’s Guide 269 Union UniqueXML language XPathIndex 271PowerDesigner 272273 274 IBM DB2275 276 277 XML278