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Sybase XML manual Defining a key constraint

Models: XML

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Defining identity constraints

Defining a key constraint

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

A key means that data should be unique, not null and always present within a specified scope.

For example:

Generated schema:

The KEYCODE key constraint, defined on the project element, specifies that the code attribute must be unique, not null and always present within the product element.

To display a key property sheet, double-click its name or its icon in the

Browser tree view.

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Sybase XML manual Defining a key constraint

Contents

Sybase PowerDesigner 11.1Last Revised June Contents 101 Managing external shortcuts through references and data100 102Working with an XML model 139 169 Why reverse engineer an XSD, a DTD or an XDRHow to reverse engineer an XSD, a DTD or an XDR Mapping XML Model objects to OOM objects 171Exchanging data with databases supporting XML 215 ViiViii Subject AudienceDocumentation primer Object Oriented Model Getting Started Conceptual Data Model User’s Guide To work with the CDMPhysical Data Model User’s Guide 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 Defining the XML model environment Choosing the XML language of an XML modelNot certified resource file Changing the XML language of an XML model ™ To change 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 an XML model Defining model properties™ To define the properties of an XML model Model General Property DescriptionModel Detail Model Items Button Moves itemTool 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 ™ To open an existing XML model Opening an existing XML modelDetaching an XML model from the workspace ™ To detach an XML model from a workspaceModel Saving and closing an XML modelSaving an XML Closing an XML modelDefining an XML model Building an XML model XML diagram basics Defining an XML diagramWhy build an XML diagram? Creating an XML diagram Group Symbols featureExpand/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 constraints properties Element mapping propertiesElement Sources Creating an element Attributes Mapping™ 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 valuesAdding an attribute to an element Element values with XDR™ To add an attribute to an element Modifying element display preferences Linking child elements to a parent elementPreference Description Defining group particles 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 Defining a keyRef constraint Key general propertiesKey fields properties Defining identity constraints Creating an identity constraint KeyRef general propertiesKeyRef 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 propertiesAttribute group AttributesProperties 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 What is a simple type? Defining simple typesType of derivation Description Creating a simple type Defining simple type propertiesModifying the simple type display preference ™ 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 propertiesSources Complex type mapping propertiesComplex Type 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 ™ To create a simple content Defining simple content propertiesSimple content General property™ To create a complex content Defining complex content propertiesComplex content General propertiesDerivation in element property sheet Defining derivationsDeriving by extension 102Defining extension ™ To define a derivation by extension103 Deriving by restriction Restriction on a simple type104 Restriction detail Defining restriction facetsRestriction general 105Enumerations Facet generalRestriction 106Restriction patterns 107Creating a restriction on a simple type ™ To create a restriction on a simple type108 109 110 ™ To create a restriction on a complex type Restriction on a complex typeEnumeration and Pattern facets 111Deriving by list 112Deriving by union ™ To define a simple type derivation by list113 ™ To define a simple type derivation by union Union generalUnion types 114Defining annotations 115Annotation general property Defining annotation propertiesDefining documentation properties Annotation items propertiesDocumentation general properties Documentation contentDefining application information properties Application information general propertiesApplication information content Creating an annotation118 119 Defining notations Defining notation properties120 Creating a notation ™ To create a notation from the Browser tree view121 122 Defining entitiesDefining entity properties Entity name Reference ValueCreating an entity ™ To create an entity from the Browser tree view123 124 Defining import properties Defining import, include and redefineDefining an import Import generalCreating an import ™ To create an import from the Browser tree view126 Include general Defining an includeDefining include properties 127™ To create an include from the Browser tree view Defining a redefineCreating an include 128Defining redefine properties Redefine general129 ™ To create a redefine from the Browser tree view Creating a redefineRedefine items 130131 Defining business rule properties What is a business rule?Defining business rules Business rule general properties133 Creating a business ruleBusiness rule expression property 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 139XML model check options Levels of problem severityChecking an XML model 140Automatic correction Selecting objects in the diagramXML model object selection in the Check Model 141Checking an XML model ™ To check an XML model142 Selecting all or clearing all check boxes 143Dockable result window ™ To display errors and warnings selected in the last checkDisplaying previously applied check options in an XML model 144Contextual menu Making corrections based on XML model check resultsDisplay the Check toolbar 145™ To make manual corrections to an XML model Making manual corrections to an XML modelMaking automatic corrections to an XML model ™ To make automatic corrections to an XML modelExistence of particle XML Model objects verified by Check ModelGroup particle check Invalid cardinalityUndefined identifier Model checkIdentifier uniqueness Shortcut code uniquenessMissing namespaces Business rule check in an XSMData source check Business rule name and code uniquenessExistence of model File checkData source name and code uniqueness 150Existence of external file location Entity checkEmbedded file name uniqueness Entity name and code uniquenessInclude check Simple type checkComplex type check Element name and code uniqueness Element checkExistence of attribute Undefined typeUndefined reference 154Group check Group name and code uniqueness155 Attribute name and code uniqueness Attribute checkNotation check 156Undefined notation Attribute group checkNotation name and code uniqueness Attribute group name and code uniquenessRedefine check Undefined schema location and namespaceImport check Existence of attributesKey name and code uniqueness Key checkExistence of component Existence of fieldsKeyRef check KeyRef name and code uniqueness160 Unique check Unique name and code uniqueness161 Extended object name and code uniqueness Extended object checkExtended link check Extended link name and code uniquenessRestriction check Replication checkExtension check Partial object replicationSimple type list check Existence of facet164 Existence of items Simple type union checkAnnotation check 165Defining data sources in an XML model Mapping objects in an XML modelUnderstanding object mapping 166™ To create a data source in an XML model Data source properties in an XML modelCreating a data source in an XML model 167168 169 Mapping XML Model objects to PDM objectsMapping elements XML Model object PDM objectMapping complex types 170Tool Description Mapping XML Model objects to OOM objects 171XML Model object OOM object Creating a mapping for an XML object ™ To create a mapping for an element172 173 Create From Sources and Generate Mapping tools 174Modifying the mapping of an attribute ™ To modify the mapping of an attribute175 Move Manipulating XML objects graphicallyLocal objects 176™ To convert a local object into a global object Global objectsExample converting a local object into a global object Drag and dropAfter conversions 178Comparing and merging XML models 179180 Generating an XML model from a Physical Data ModelGenerating XML Model objects PDM object Generated object in an XML modelGenerate new XML Generating and updating an XML modelXML model naming conventions 181XML model Update existingDefining XML model generation options Clearing the Preserve modifications check boxCheck model before generation 183Generating a new XML model from a PDM ™ To generate a new XML model from a PDM184 185 Updating an existing XML modelGenerating an XML model from a package Preserve modifications Result™ To update an existing XML model by generating from a PDM Preserve modifications186 Merging models 187Generating an XML model from an Object- Oriented Model 188OOM Object Generated object in an XML model 189 190 191 Generating a new XML model from an OOM ™ To generate a new XML model from an OOM192 193 ™ To update an existing XML model by generating from an OOM 194195 Creating an XML model report What is a report?Editing an XML model report ™ To create a model report197 Inserting diagram Language in a template198 199 200 201 Why generate an XDR file? Why generate an XSD file?Why generate a DTD file? Generating an XSD, a DTD or an XDR fileDefining generation targets Defining generation parametersCheck model 203Defining generation tasks Using the Move up or down arrowsDefining generation options 204205 How to generate an XSD, a DTD or an XDR file?Parameter entities during DTD generation Model targeted with Generated file206 207 How to reverse engineer an XSD, a DTD or an XDR file? What is reverse engineering?Why reverse engineer an XSD, a DTD or an XDR file? Reverse engineering an XSD, a DTD or an XDR fileReverse engineering to a new XML model Reverse engineering optionsReverse engineering target models 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? 216Generating an annotated schema for Microsoft SQL Server Mapping XML objects to PDM objects217 218 219 220 221 Extended model definitions 222Annotated schema preview 223224 Reinforcing mapping with extended attributes 225226 Annotation Description227 228 229 Generating an annotated schema for Oracle ™ To generate an annotated schema for Oracle230 231 232 233 234 235 236 237 Generating a DAD file for IBM DB2™ To generate a DAD file for IBM DB2 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 Generating SQL/XML queries ™ To generate SQL/XML queries249 Generating SQL/XML queries 250251 252 253 254 Generating from an XML model 255256 Generation basicsTarget models parameters Generation option DescriptionGenerating from an XML model 257258 Why generate an XML model from an XML model? Generating an XML model from an XML model259 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 XML language UnionUnique XPathIndex 271PowerDesigner 272273 274 IBM DB2275 276 277 XML278