Meta Resource Management System

A Resource is composed of its Attributes and is an instance of a ResourceType which specifies which Attributes the Resource may have.

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A ResourceType specifies (by composition) the Attributes that a Resource of this type has.

name: the name of the ResourceType

Abstract base class for attribute types that a ResourceType aggregates.

name: the name of the AttributeType

onlyPredefinedValuesAllowed: if true, the user may only select the predefined values for an Attribute that has this type; if false, he may enter another value as well

mandatory: if true, the user must enter a value for Attributes of this type

frozen: if true, the user may not change the value of Attributes of this type

Concrete AttributeType for NumericalAttributes.

predefinedValues[]: an array specifying predefined values for Attributes of this type

minValue: the minimum value Attributes of this type may have

maxValue: the maximum value Attributes of this type may have

Concrete AttributeType for TextAttributes.

predefinedValues[]: an array specifying predefined values for Attributes of this type

minSize: the minimum number of characters Attributes of this type may have

maxSize: the maximum number of characters Attributes of this type may have

Abstract base class for attributes that a Resource aggregates.

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Concrete Attribute for a numerical property characterisation of a Resource.

value: numerical property characterisation of a Resource

Concrete Attribute for a textual property characterisation of a Resource.

value: textual property characterisation of a Resource

A Link references the two Resources that are linked together by it. Its consistency is checked by the LinkRule.

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A LinkRule defines the characteristics of a consistent Link. It references two ResourceTypes whose instances (Resources) may be linked together and aggregates two CadinalitySpecs that define the allowed cardinalities for links between the two ResourceTypes.

name: name of the LinkRule.

Specifies the minimum and maximum cardinality for one end t1 of a link rule. Example: Two ResourceTypes t1 and t2 are taking part in a LinkRule. If there is the cardinality specification min=1 and max=4 for t1, this means that one specific Resource of type t2 must have at least 1 and may have up to 4 Links to Resources of type t1. In the specification of the cardinality for ResourceType t1 a NumberAttributeType of the ResourceType t1 may be referenced.

minCardinality: value for the minimum cardinality; may be overriden by a reference to a NumberAttributeType

maxCardinality: value for the maximum cardinality; may be overriden by a reference to a NumberAttributeType

Class for user accounts of the MRMS. Its instances may play Roles in the system.

name: username

password: password of the user

realname: real name of the user

A Role defines which AccessRights its players (Users) have.

name: name of the Role

isAdministratorRole: defines if Users of the Role have administration rights

Abstract base class for access rights. If a Role is associated with an AccessRight we say it owns the AccessRight. Users have the AccessRights which the Roles they play own.

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Concrete AccessRight that defines owner's authority of working with Resources that are of a specific ResourceType.

canCreate: defines if Resources of the referenced ResourceType may be created

canDelete: defines if Resources of the referenced ResourceType may be deleted

canLink: defines if Resources of the referenced ResourceType may be linked

Concrete AccessRight that defines owner's authority of accessing Atrributes of Resources that are of a specific ResourceType.

canRead: defines if Attributes of the referenced AttributeType may be read

canWrite: defines if Attributes of the referenced AttributeType may be written