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Difference between revisions of "MetaProperty"


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For enhanced reuse, MetaProperties can be organized in a Pool and linked to many MetaClasses, using the [[SYSREL_METAPROPERTY|Systemrelation MetaProperty]]
 
For enhanced reuse, MetaProperties can be organized in a Pool and linked to many MetaClasses, using the [[SYSREL_METAPROPERTY|Systemrelation MetaProperty]]
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==Initial value==
 
==Initial value==
 
The initial value of a MetaProperty defines which value will be set to the property initially when a new instance of it is created. Once the value is changed, the initial value is lost for this instance.
 
The initial value of a MetaProperty defines which value will be set to the property initially when a new instance of it is created. Once the value is changed, the initial value is lost for this instance.
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==Default value==
 
==Default value==
 
The default value of a MetaProperty defines which value will be delivered by a property if it doesn't have an own value set.
 
The default value of a MetaProperty defines which value will be delivered by a property if it doesn't have an own value set.
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==Editing a MetaProperty==
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Once a MetaProperty is used on a single [[MetaClass]] editing of properties is restricted to properties that may not effect data validity.
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The System uses a [[Rule]] to validate the edited properties and creates a [[RuleViolation]] whenever a "locked" property is edited.
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Following properties may not be changed/edited for a "used" MetaProperty:
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*Name
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*PropertyType
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==Released To LiveMode==
 
==Released To LiveMode==

Revision as of 09:57, 9 July 2013

Basics

In UBIK, a MetaProperty describes a single feature of a certain MetaClass. A MetaProperty will never hold own values, but it serves as a definition for a resulting BaseProperty on a derived ContentClass.

For enhanced reuse, MetaProperties can be organized in a Pool and linked to many MetaClasses, using the Systemrelation MetaProperty


Initial value

The initial value of a MetaProperty defines which value will be set to the property initially when a new instance of it is created. Once the value is changed, the initial value is lost for this instance.


Default value

The default value of a MetaProperty defines which value will be delivered by a property if it doesn't have an own value set.


Editing a MetaProperty

Once a MetaProperty is used on a single MetaClass editing of properties is restricted to properties that may not effect data validity. The System uses a Rule to validate the edited properties and creates a RuleViolation whenever a "locked" property is edited. Following properties may not be changed/edited for a "used" MetaProperty:

  • Name
  • PropertyType


Released To LiveMode

A MetaProperty is marked as released to live mode when:


Editing a released MetaProperty is restricted to properties that have no effect on the released table structure. The System uses a Rule to validate the edited properties and creates a RuleViolation whenever a "locked" property is edited. Following properties may not be changed/edited for a released MetaProperty:

  • Name
  • PropertyType
  • StringLen
  • Multilanguage
  • Indexcount
  • Serialize
  • NeedsValidation
  • IndexType



See also