The following table lists the 14 Classes and the 22 Properties declared in CRMdig version 5.0.
| D1 Digital Object | | | SubClass Of: | | E73 Information Object | E73 | | SuperClass Of: | | D9 Data Object D14 Software D35 Area | D9 D14 D35 | | Scope Note: | | This class comprises identifiable immaterial items that can be represented as sets of bit sequences, such as data sets, e-texts, images, audio or video items, software, etc., and are documented as single units. Any change in the bit sequence results in a new instance of D1 Digital Object. Any aggregation of instances of D1 Digital Object into a whole treated as a single unit is also regarded as an instance of D1 Digital Object. This means that for instance, the content of a DVD, an XML file on it, and an element of this file, are regarded as distinct instances of D1 Digital Object, mutually related by the P106 is composed of (forms part of) property. In the case of embedded metadata, the documentalist must take care to distinguish the identity of the object including the metadata from the identity of the included content described by the metadata. A D1 Digital Object does not depend on a specific physical carrier, and it can exist on one or more carriers simultaneously. | | | Examples: | | - | | | In First Order Logic: | | D1(x) ⇒ E73(x) | | Properties: | | - |
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| D2 Digitization Process | | | SubClass Of: | | D11 Digital Measurement Event | D11 | | SuperClass Of: | | - | - | | Scope Note: | | This class comprises events that result in the creation of instances of D9 Data Object that represent the appearance (for instance, light reflection properties), form or recorded inner structure of an instance of E18 Physical Thing such as paper documents, statues, buildings, paintings, biological objects etc. Such methods are typically called “imaging techniques”. A particular case is the analogue-to-digital conversion of audiovisual material. This class represents the transition from a material item to an immaterial representation of a relevant spatial distribution of local physical properties on the material item (in the case of audio material item, also along the respective sound track) Subsequent processing steps of the output of digitization processes that preserve or improve the relevant spatial correlations with the digitized object or a part of it are regarded as instances of D3 Formal Derivation. | | | Examples: | | - A mummy CT, a statue scanned, a manuscript page…
| | | In First Order Logic: | | D2(x) ⇒ D11(x) | | Properties: | | L1 digitized (was digitized by): E18 Physical Thing |
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| D3 Formal Derivation | | | SubClass Of: | | D10 Software Execution | D10 | | SuperClass Of: | | - | - | | Scope Note: | | This class comprises events that result in the creation of a D1 Digital Object from another one following a deterministic algorithm, such that the resulting instance of digital object shares representative properties with the original object. In other words, this class describes the transition from an immaterial object referred to by property L21 used as derivation source (was derivation source for) to another immaterial object referred to by property L22 created derivative (was derivative created by) preserving the representation of some things but in a different form. Characteristic examples are colour corrections, contrast changes and resizing of images. | | | Examples: | | | | | In First Order Logic: | | D3(x) ⇒ D10(x) | | Properties: | | L21 used as derivation source (was derivation source for): D1 Digital Object L22 created derivative (was derivative created by): D1 Digital Object |
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| D7 Digital Machine Event | | | SubClass Of: | | E11 Modification E65 Creation | E11 E65 | | SuperClass Of: | | D10 Software Execution D11 Digital Measurement Event D12 Data Transfer Event | D10 D11 D12 | | Scope Note: | | This class comprises events that happen on physical digital devices following a human activity that intentionally caused its immediate or delayed initiation and results in the creation of a new instance of D1 Digital Object on behalf of the human actor. The input of a D7 Digital Machine Event may be parameter settings and/or data to be processed. Some D7 Digital Machine Events may form part of a wider E65 Creation event. In this case, all machine output of the partial events is regarded as creation of the overall activity. | | | Examples: | | | | | In First Order Logic: | | D7(x) ⇒ D11(x) | | Properties: | | L10 had input (was input of): D1 Digital Object L11 had output (was output of): D1 Digital Object L12 happened on device (was device for): D8 Digital Device L18 has modified (was modified by): D13 Digital Information Carrier L23 used software or firmware (was software or firmware used by): D14 Software |
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| D8 Digital Device | | | SubClass Of: | | E22 Human-Made Object | E22 | | SuperClass Of: | | - | - | | Scope Note: | | This class comprises identifiable material items such as computers, scanners, cameras, etc. that have the capability to process or produce instances of D1 Digital Object. | | | Examples: | | | | | In First Order Logic: | | D8(x) ⇒ E22(x) | | Properties: | | - |
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| D9 Data Object | | | SubClass Of: | | D1 Digital Object E31 Document | D1 E31 | | SuperClass Of: | | - | - | | Scope Note: | | This class comprises instances of D1 Digital Object that are the result of measurements or other observations and / or their algorithmic evaluation in the form of structured data, such as encoded formal propositions, CSV files (“comma separated values”) or equivalent representations. If an instance of D1 Digital Object contains the value set of an instance of E54 Dimension, such as the primary data from an instance of S21 Measurement, this association can be documented with the property L61 contains value set of (has value set representation). | | | Examples: | | | | | In First Order Logic: | | D8(x) ⇒ E22(x) | | Properties: | | L61 contains value set of (has value set representation): E54 Dimension |
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| D10 Software Execution | | | SubClass Of: | | D7 Digital Machine Event | D7 | | SuperClass Of: | | D3 Formal Derivation | D3 | | Scope Note: | | This class comprises events by which a digital device runs a software program or a series of computing operations on a digital object as a single task, which is completely determined by its digital input, the software and the generic properties of the device. | | | Examples: | | | | | In First Order Logic: | | D10(x) ⇒ D7(x) | | Properties: | | L2 used as source (was source for): D1 Digital Object L13 used parameters (parameters for): D1 Digital Object L24 created logfile (was logfile created by): D1 Digital Object |
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| D11 Digital Measurement Event | | | SubClass Of: | | D7 Digital Machine Event S21 Measurement | D7 S21 | | SuperClass Of: | | D2 Digitization Process | D2 | | Scope Note: | | This class comprises actions measuring physical properties using a digital device, that are determined by a systematic procedure and creates an instance of D9 Data Object, which is stored on an instance of D13 Digital Information Carrier. In contrast to instances of D10 Software Execution, environmental factors have an intended influence on the outcome of an instance of D11 Digital Measurement Event. Measurement devices may include running distinct software, such as the RAW to JPEG conversion in digital cameras, as an integral part of the overall process. If the respective software is configurable for the device, the event is regarded as an instance of both classes, D10 Software Execution and D11 Digital Measurement Event. The actual physical properties measured should be documented using the property O39 observed dimension (was observed in): E54 Dimension. Note that the property L20 has created (was created by): D9 Data Object constitutes a shortcut of the full path from D11 Digital Measurement Event through O39 observed dimension (was observed in), E54 Dimension, L61 contains value set of (has value set representation), to D9 Data Object. | | | Examples: | | | | | In First Order Logic: | | D11(x) ⇒ D7(x) D11(x) ⇒ S21(x) | | Properties: | | L20 has created (was created by): D9 Data Object |
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| D12 Data Transfer Event | | | SubClass Of: | | D7 Digital Machine Event | D7 | | SuperClass Of: | | - | - | | Scope Note: | | This class comprises events that transfer a digital object from one digital carrier to another. Normally, the digital object remains the same. If in general or by observation the transfer implies or has implied some data corruption, the change of the digital objects may be documented distinguishing input and output rather than instantiating the property L14 transferred (was transferred by). | | | Examples: | | | | | In First Order Logic: | | D12(x) ⇒ D7(x) | | Properties: | | L14 transferred (was transferred by): D1 Digital Object L15 has sender (was sender for): D8 Digital Device L16 has receiver (was receiver of): D8 Digital Device |
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| D13 Digital Information Carrier | | | SubClass Of: | | E22 Human-Made Object | E22 | | SuperClass Of: | | - | - | | Scope Note: | | This class comprises all instances of E84 Information Carrier that are explicitly designed to be used as persistent digital physical carriers of instances of D1 Digital Object. An instance of D13 Digital Information Carrier may or may not contain information, e.g., an empty diskette. | | | Examples: | | | | | In First Order Logic: | | D13(x) ⇒ E22(x) | | Properties: | | L19 stores (is stored on): D1 Digital Object |
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| D14 Software | | | SubClass Of: | | D1 Digital Object | D1 | | SuperClass Of: | | - | - | | Scope Note: | | This class comprises software codes, computer programs, procedures and functions that are used to operate a system of digital objects. | | | Examples: | | | | | In First Order Logic: | | D14(x) ⇒ D1(x) | | Properties: | | - |
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| D29 Annotation Object | | | SubClass Of: | | E89 Propositional Object | E89 | | SuperClass Of: | | - | - | | Scope Note: | | This class comprises objects that make propositions about other artefacts. Instances of this class are not the attributes themselves, by which things are annotated, but represent the connection between the concepts related in a proposition, and the activities of creation, modification and deletion. This class is specialized by appropriate subclasses to express more specific relationships between annotated things, such as knowledge object, same as etc. | | | Examples: | | | | | In First Order Logic: | | D29(x) ⇒ E89(x) | | Properties: | | L43 annotates (is annotated by): E1 CRM Entity |
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| D30 Annotation Event | | | SubClass Of: | | E65 Creation | E65 | | SuperClass Of: | | - | - | | Scope Note: | | This class comprises activities of creating an annotation in the form of an instance of D29 Annotation Object. These activities typically constitute characteristic parts in scholarly and scientific workflows and processes, often in a dialogue or exchange of opinions between experts. | | | Examples: | | | | | In First Order Logic: | | D30(x) ⇒ E65(x) | | Properties: | | L48 created annotation (was annotation created by): D29 Annotation Object |
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| D35 Area | | | SubClass Of: | | D1 Digital Object | D1 | | SuperClass Of: | | - | - | | Scope Note: | | This class describes a part (of any shape or size) of interest in basically any media object stored in the Object Repository, i.e., a text, an image, a video or a 3D model. It points to content consisting of just a portion or area of a file. In some contexts, however, the area can also point to content represented by an integral (i.e., proper) file. It is equal to the METS AREA element. | | | Examples: | | | | | In First Order Logic: | | D35(x) ⇒ D1(x) | | Properties: | | L49 is primary area of (has primary area): D1 Digital Object L50 is propagated area (has propagated area): D1 Digital Object |
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| L1 digitized (was digitized by) | | | Domain: | | D2 Digitization Process | D2 | | Range: | | E18 Physical Thing | E18 | | SubProperty Of: | | S21 Measurement. O24 measured (was measured by): S15 Observable Entity | Error: not found property reference O24 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property associates an instance of D2 Digitization Process with an instance of E18 Physical Thing which is a material thing. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L1(x,y) ⇒ D2(x) L1(x,y) ⇒ E18(y) L1(x,y) ⇒ O24(x,y) |
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| L2 used as source (was source for) | | | Domain: | | D10 Software Execution | D10 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | D7 Digital Machine Event. L10 had input (was input of): D1 Digital Object | L10 | | SuperProperty Of: | | D3 Formal Derivation. L21 used as derivation source (was derivation source for): D1 Digital Object | L21 | | Quantification: | | - | | | Scope Note: | | This property associates an instance of D10 Software Execution with an instance of D1 Digital Object which is used as a source, software essential for the performance. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L2(x,y) ⇒ D10(x) L2(x,y) ⇒ D1(y) L2(x,y) ⇒ L10(x,y) |
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| L10 had input (was input of) | | | Domain: | | D7 Digital Machine Event | D7 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | E7 Activity. P16 used specific object (was used for): E70 Thing | Error: not found property reference P16 | | SuperProperty Of: | | D10 Software Execution. L2 used as source (was source for): D1 Digital Object D10 Software Execution. L13 used parameters (parameters for): D1 Digital Object D12 Data Transfer Event. L14 transferred (was transferred by): D1 Digital Object | L2 L13 L14 | | Quantification: | | - | | | Scope Note: | | This property associates an instance ofD7 Digital Machine Event with an instance of D1 Digital Object which is the input used to specify the machine action. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L10(x,y) ⇒ D7(x) L10(x,y) ⇒ D1(y) L10(x,y) ⇒ P16(x,y) |
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| L11 had output (was output of) | | | Domain: | | D7 Digital Machine Event | D7 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | E65 Creation. P94 has created (was created by): E28 Conceptual Object | Error: not found property reference P94 | | SuperProperty Of: | | D11 Digital Measurement Event. L20 has created (was created by): D9 Data Object D3 Formal Derivation. L22 created derivative (was derivative created by): D1 Digital Object D10 Software Execution. L24 created logfile (was logfile created by): D1 Digital Object | L20 L22 L24 | | Quantification: | | - | | | Scope Note: | | This property associates an instance of D7 Digital Machine Event with an instance of D1 Digital Object which is the output of the activity. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L11(x,y) ⇒ D7(x) L11(x,y) ⇒ D1(y) L11(x,y) ⇒ P94(x,y) |
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| L12 happened on device (was device for) | | | Domain: | | D7 Digital Machine Event | D7 | | Range: | | D8 Digital Device | D8 | | SubProperty Of: | | E5 Event. P12 occurred in the presence of (was present at): E77 Persistent Item | Error: not found property reference P12 | | SuperProperty Of: | | D12 Data Transfer Event. L15 has sender (was sender for): D8 Digital Device D12 Data Transfer Event. L16 has receiver (was receiver of): D8 Digital Device | L15 L16 | | Quantification: | | - | | | Scope Note: | | This property associates an instance of D7 Digital Machine Event with an object, the D8 Digital Device, which happened with, e.g. a capturing event that happened on/with a digital camera, etc. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L12(x,y) ⇒ D7(x) L12(x,y) ⇒ D8(y) L12(x,y) ⇒ P12(x,y) |
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| L13 used parameters (parameters for) | | | Domain: | | D10 Software Execution | D10 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | D7 Digital Machine Event. L10 had input (was input of): D1 Digital Object | L10 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property associates an instance of D10 Software Execution with an instance of D1 Digital Object used as a parameter during the process. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L13(x,y) ⇒ D10(x) L13(x,y) ⇒ D1(y) L13(x,y) ⇒ L10(x,y) |
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| L14 transferred (was transferred by) | | | Domain: | | D12 Data Transfer Event | D12 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | D7 Digital Machine Event. L10 had input (was input of): D1 Digital Object | L10 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property identifies an instance of D1 Digital Object transferred by a D12 Data Transfer Event. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L14(x,y) ⇒ D12(x) L14(x,y) ⇒ D1(y) L14(x,y) ⇒ L10(x,y) |
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| L15 has sender (was sender for) | | | Domain: | | D12 Data Transfer Event | D12 | | Range: | | D8 Digital Device | D8 | | SubProperty Of: | | D7 Digital Machine Event. L12 happened on device (was device for): D8 Digital Device | L12 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property identifies an instance of D8 Digital Device used as a medium on which data are transferred through a D12 Data Transfer Event. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L15(x,y) ⇒ D12(x) L15(x,y) ⇒ D8(y) L15(x,y) ⇒ L12(x,y) |
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| L16 has receiver (was receiver of) | | | Domain: | | D12 Data Transfer Event | D12 | | Range: | | D8 Digital Device | D8 | | SubProperty Of: | | D7 Digital Machine Event. L12 happened on device (was device for): D8 Digital Device | L12 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property identifies an instance of D8 Digital Device used as a medium to receive data through a D12 Data Transfer Event. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L16(x,y) ⇒ D12(x) L16(x,y) ⇒ D8(y) L16(x,y) ⇒ L12(x,y) |
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| L18 has modified (was modified by) | | | Domain: | | D7 Digital Machine Event | D7 | | Range: | | D13 Digital Information Carrier | D13 | | SubProperty Of: | | E11 Modification. P31 has modified (was modified by): E18 Physical Thing | Error: not found property reference P31 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property identifies a D13 Digital Information Carrier modified in a D7 Digital Machine Event for storing its results. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L18(x,y) ⇒ D7(x) L18(x,y) ⇒ D13(y) L18(x,y) ⇒ P31(x,y) |
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| L19 stores (is stored on) | | | Domain: | | D13 Digital Information Carrier | D13 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | E18 Physical Thing. P128 carries (is carried by): E90 Symbolic Object | Error: not found property reference P128 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property associates an instance of a D13 Digital Information Carrier with the instance of Digital Object that is stored on it. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L19(x,y) ⇒ D13(x) L19(x,y) ⇒ D1(y) L19(x,y) ⇒ P128(x,y) |
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| L20 has created (was created by) | | | Domain: | | D11 Digital Measurement Event | D11 | | Range: | | D9 Data Object | D9 | | SubProperty Of: | | D7 Digital Machine Event. L11 had output (was output of): D1 Digital Object | L11 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property associates an instance of D11 Digital Measurement Event with an instance of D9 Data Object that was created for storing the results, i.e., observed values, of the measurement. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L20(x,y) ⇒ D11(x) L20(x,y) ⇒ D9(y) L20(x,y) ⇒ L11(x,y) |
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| L21 used as derivation source (was derivation source for) | | | Domain: | | D3 Formal Derivation | D3 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | D10 Software Execution. L2 used as source (was source for): D1 Digital Object | L2 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property associates an instance of a D3 Formal Derivation with the instance of D1 Digital Object that is used as a derivation source. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L21(x,y) ⇒ D3(x) L21(x,y) ⇒ D1(y) L21(x,y) ⇒ L2(x,y) |
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| L22 created derivative (was derivative created by) | | | Domain: | | D3 Formal Derivation | D3 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | D7 Digital Machine Event. L11 had output (was output of): D1 Digital Object | L11 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property associates an instance of a D3 Formal Derivation with the instance of D1 Digital Object that is used to create a version of. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L22(x,y) ⇒ D3(x) L22(x,y) ⇒ D1(y) L22(x,y) ⇒ L11(x,y) |
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| L23 used software or firmware (was software or firmware used by) | | | Domain: | | D7 Digital Machine Event | D7 | | Range: | | D14 Software | D14 | | SubProperty Of: | | E7 Activity. P16 used specific object (was used for): E70 Thing | Error: not found property reference P16 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property associates an instance of D7 Digital Machine Event with the instance of D14 Software that it used. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L23(x,y) ⇒ D7(x) L23(x,y) ⇒ D14(y) L23(x,y) ⇒ P16(x,y) |
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| L24 created logfile (was logfile created by) | | | Domain: | | D10 Software Execution | D10 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | D7 Digital Machine Event. L11 had output (was output of): D1 Digital Object | L11 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property identifies the logfile that was created by an instance of D10 Software Execution in order to record all the activities in the system. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L24(x,y) ⇒ D10(x) L24(x,y) ⇒ D1(y) L24(x,y) ⇒ L11(x,y) |
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| L43 annotates (is annotated by) | | | Domain: | | D29 Annotation Object | D29 | | Range: | | E1 CRM Entity | E1 | | SubProperty Of: | | E89 Propositional Object. P129 is about (is subject of): E1 CRM Entity | Error: not found property reference P129 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property associates an instance of D29 Annotation Object with a relevant instance of E1 CRM Entity explicitly referred to in the annotation object. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L43(x,y) ⇒ D29(x) L43(x,y) ⇒ E1(y) |
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| L48 created annotation (was annotation created by) | | | Domain: | | D30 Annotation Event | D30 | | Range: | | D29 Annotation Object | D29 | | SubProperty Of: | | E65 Creation. P94 has created (was created by): E28 Conceptual Object | Error: not found property reference P94 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property identifies the D29 Annotation Object (associations) that came into existence as a result of a D30 Annotation Event. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L48(x,y) ⇒ D30(x) L48(x,y) ⇒ D29(y) L48(x,y) ⇒ P94(x,y) |
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| L49 is primary area of (has primary area) | | | Domain: | | D35 Area | D35 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | E90 Symbolic Object. P106 is composed of (forms part of): E90 Symbolic Object | Error: not found property reference P106 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property describes the association between an instance of a particular D35 Area declared in an original instance of D1 Digital Object. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L49(x,y) ⇒ D35(x) L49(x,y) ⇒ D1(y) L49(x,y) ⇒ P106(x,y) |
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| L50 is propagated area (has propagated area) | | | Domain: | | D35 Area | D35 | | Range: | | D1 Digital Object | D1 | | SubProperty Of: | | E90 Symbolic Object. P106 is composed of (forms part of): E90 Symbolic Object | Error: not found property reference P106 | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property describes the association between an instance of D35 Area and the instance of D1 Digital Object to which it is propagated. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L49(x,y) ⇒ D35(x) L49(x,y) ⇒ D1(y) L49(x,y) ⇒ P106(x,y) |
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| L54 is same as | | | Domain: | | E1 CRM Entity | E1 | | Range: | | E1 CRM Entity | E1 | | SubProperty Of: | | - | - | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property describes a non-unique identification applied to E1 CRM Entity. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L54(x,y) ⇒ E1(x) L54(x,y) ⇒ E1(y) |
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| L61 contains value set of (has value set representation) | | | Domain: | | D9 Data Object | D9 | | Range: | | E54 Dimension | E54 | | SubProperty Of: | | - | - | | SuperProperty Of: | | - | - | | Quantification: | | - | | | Scope Note: | | This property associates an instance of D9 Data Object with an instance of E54 Dimension, in the case that the former contains the set of values of the respective dimension in a digital format. | | | Properties: | | - | | | Examples: | | | | | In First Order Logic: | | L61(x,y) ⇒ D9(x) L61(x,y) ⇒ E54(y) |
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