org.semanticdesktop.aperture.vocabulary
Class NIE
java.lang.Object
  
org.semanticdesktop.aperture.vocabulary.NIE
public class NIE
- extends Object
 
Vocabulary File. Created by org.semanticdesktop.aperture.vocabulary.VocabularyWriter on Thu Jul 01 14:28:14 CEST 2010
 input file: /core/src/main/resources/org/semanticdesktop/aperture/vocabulary/nie.ttl
 namespace: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#
| 
Field Summary | 
static URI | 
byteSize
 
          Type: Property  
 Label: byteSize   
 Comment: The overall size of the data object in bytes. | 
static URI | 
characterSet
 
          Type: Property  
 Label: characterSet   
 Comment: Characterset in which the content of the InformationElement was created. | 
static URI | 
comment
 
          Type: Property  
 Label: comment   
 Comment: A user comment about an InformationElement. | 
static URI | 
contentCreated
 
          Type: Property  
 Label: contentCreated   
 Comment: The date of the content creation. | 
static URI | 
contentLastModified
 
          Type: Property  
 Label: contentLastModified   
 Comment: The date of the last modification of the original content (not its corresponding DataObject or local copy). | 
static URI | 
contentSize
 
          Type: Property  
 Label: contentSize   
 Comment: The size of the content. | 
static URI | 
copyright
 
          Type: Property  
 Label: copyright   
 Comment: Content copyright   
 Range: http://www.w3.org/2001/XMLSchema#string  
  | 
static URI | 
coreGraph
 
          Type: Property  
 Label: coreGraph   
 Comment: Connects the data object with the graph that contains information about it. | 
static URI | 
created
 
          Type: Property  
 Label: created   
 Comment: Date of creation of the DataObject. | 
static URI | 
DataObject
 
          Type: Class  
 Label: DataObject   
 Comment: A unit of data that is created, annotated and processed on the user desktop. | 
static URI | 
dataSource
 
          Type: Property  
 Label: dataSource   
 Comment: Marks the provenance of a DataObject, what source does a data object come from. | 
static URI | 
DataSource
 
          Type: Class  
 Label: DataSource   
 Comment: A superclass for all entities from which DataObjects can be extracted. | 
static URI | 
depends
 
          Type: Property  
 Label: depends   
 Comment: Dependency relation. | 
static URI | 
description
 
          Type: Property  
 Label: description   
 Comment: A textual description of the resource. | 
static URI | 
disclaimer
 
          Type: Property  
 Label: disclaimer   
 Comment: A disclaimer   
 Range: http://www.w3.org/2001/XMLSchema#string  
  | 
static URI | 
generator
 
          Type: Property  
 Label: generator   
 Comment: Software used to "generate" the contents. | 
static URI | 
generatorOption
 
          Type: Property  
 Label: generatorOption   
 Comment: A common superproperty for all settings used by the generating software. | 
static URI | 
hasLogicalPart
 
          Type: Property  
 Label: hasLogicalPart   
 Comment: Generic property used to express 'logical' containment relationships between InformationElements. | 
static URI | 
hasPart
 
          Type: Property  
 Label: hasPart   
 Comment: Generic property used to express 'physical' containment relationships between DataObjects. | 
static URI | 
identifier
 
          Type: Property  
 Label: identifier   
 Comment: An unambiguous reference to the InformationElement within a given context. | 
static URI | 
InformationElement
 
          Type: Class  
 Label: InformationElement   
 Comment: A unit of content the user works with. | 
static URI | 
informationElementDate
 
          Type: Property  
 Label: informationElementDate   
 Comment: A point or period of time associated with an event in the lifecycle of an Information Element. | 
static URI | 
interpretedAs
 
          Type: Property  
 Label: interpretedAs   
 Comment: Links the DataObject with the InformationElement it is interpreted as. | 
static URI | 
isLogicalPartOf
 
          Type: Property  
 Label: isLogicalPartOf   
 Comment: Generic property used to express 'logical' containment relationships between DataObjects. | 
static URI | 
isPartOf
 
          Type: Property  
 Label: isPartOf   
 Comment: Generic property used to express containment relationships between DataObjects. | 
static URI | 
isStoredAs
 
          Type: Property  
 Label: isStoredAs   
 Comment: Links the information element with the DataObject it is stored in. | 
static URI | 
keyword
 
          Type: Property  
 Label: keyword   
 Comment: Adapted DublinCore: The topic of the content of the resource, as keyword. | 
static URI | 
language
 
          Type: Property  
 Label: language   
 Comment: Language the InformationElement is expressed in. | 
static URI | 
lastModified
 
          Type: Property  
 Label: lastModified   
 Comment: Last modification date of the DataObject. | 
static URI | 
lastRefreshed
 
          Type: Property  
 Label: lastRefreshed   
 Comment: Date when information about this data object was retrieved (for the first time) or last refreshed from the data source. | 
static URI | 
legal
 
          Type: Property  
 Label: legal   
 Comment: A common superproperty for all properties that point at legal information about an Information Element   
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement   
 Range: http://www.w3.org/2001/XMLSchema#string  
  | 
static URI | 
license
 
          Type: Property  
 Label: license   
 Comment: Terms and intellectual property rights licensing conditions. | 
static URI | 
licenseType
 
          Type: Property  
 Label: licenseType   
 Comment: The type of the license. | 
static URI | 
links
 
          Type: Property  
 Label: links   
 Comment: A linking relation. | 
static URI | 
mimeType
 
          Type: Property  
 Label: mimeType   
 Comment: The mime type of the resource, if available. | 
static String | 
NIE_RESOURCE_PATH
 
          Path to the ontology resource | 
static URI | 
NS_NIE
 
          The namespace for NIE | 
static URI | 
plainTextContent
 
          Type: Property  
 Label: plainTextContent   
 Comment: Plain-text representation of the content of a InformationElement with all markup removed. | 
static URI | 
relatedTo
 
          Type: Property  
 Label: relatedTo   
 Comment: A common superproperty for all relations between a piece of content and other pieces of data (which may be interpreted as other pieces of content). | 
static URI | 
rootElementOf
 
          Type: Property  
 Label: rootElementOf   
 Comment: DataObjects extracted from a single data source are organized into a containment tree. | 
static URI | 
subject
 
          Type: Property  
 Label: subject   
 Comment: An overall topic of the content of a InformationElement   
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement   
 Range: http://www.w3.org/2001/XMLSchema#string  
  | 
static URI | 
title
 
          Type: Property  
 Label: title   
 Comment: Name given to an InformationElement   
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement   
 Range: http://www.w3.org/2001/XMLSchema#string  
  | 
static URI | 
url
 
          Type: Property  
 Label: url   
 Comment: URL of a DataObject. | 
static URI | 
version
 
          Type: Property  
 Label: version   
 Comment: The current version of the given data object. | 
 
| 
Constructor Summary | 
NIE()
 
            | 
 
| 
Method Summary | 
static void | 
getNIEOntology(Model model)
 
          Puts the NIE ontology into the given model. | 
 
| Methods inherited from class java.lang.Object | 
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait | 
 
NIE_RESOURCE_PATH
public static final String NIE_RESOURCE_PATH
- Path to the ontology resource
- See Also:
 - Constant Field Values
 
 
NS_NIE
public static final URI NS_NIE
- The namespace for NIE
 
InformationElement
public static final URI InformationElement
- Type: Class 
 Label: InformationElement  
 Comment: A unit of content the user works with. This is a superclass for all interpretations of a DataObject.  
 
DataSource
public static final URI DataSource
- Type: Class 
 Label: DataSource  
 Comment: A superclass for all entities from which DataObjects can be extracted. Each entity represents a native application or some other system that manages information that may be of interest to the user of the Semantic Desktop. Subclasses may include FileSystems, Mailboxes, Calendars, websites etc. The exact choice of subclasses and their properties is considered application-specific. Each data extraction application is supposed to provide it's own DataSource ontology. Such an ontology should contain supported data source types coupled with properties necessary for the application to gain access to the data sources.  (paths, urls, passwords  etc...)  
 
DataObject
public static final URI DataObject
- Type: Class 
 Label: DataObject  
 Comment: A unit of data that is created, annotated and processed on the user desktop. It represents a native structure the user works with. The usage of the term 'native' is important. It means that a DataObject can be directly mapped to a data structure maintained by a native application. This may be a file, a set of files or a part of a file. The granularity depends on the user. This class is not intended to be instantiated by itself. Use more specific subclasses.  
 
characterSet
public static final URI characterSet
- Type: Property 
 Label: characterSet  
 Comment: Characterset in which the content of the InformationElement was created. Example: ISO-8859-1, UTF-8. One of the registered character sets at http://www.iana.org/assignments/character-sets. This characterSet is used to interpret any textual parts of the content. If more than one characterSet is used within one data object, use more specific properties.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
rootElementOf
public static final URI rootElementOf
- Type: Property 
 Label: rootElementOf  
 Comment: DataObjects extracted from a single data source are organized into a containment tree. This property links the root of that tree with the datasource it has been extracted from  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataSource  
 
informationElementDate
public static final URI informationElementDate
- Type: Property 
 Label: informationElementDate  
 Comment: A point or period of time associated with an event in the lifecycle of an Information Element. A common superproperty for all date-related properties of InformationElements in the NIE Framework.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#dateTime  
 
legal
public static final URI legal
- Type: Property 
 Label: legal  
 Comment: A common superproperty for all properties that point at legal information about an Information Element  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
isStoredAs
public static final URI isStoredAs
- Type: Property 
 Label: isStoredAs  
 Comment: Links the information element with the DataObject it is stored in.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 
language
public static final URI language
- Type: Property 
 Label: language  
 Comment: Language the InformationElement is expressed in. This property applies to the data object in its entirety. If the data object is divisible into parts expressed in multiple languages - more specific properties should be used. Users are encouraged to use the two-letter code specified in the RFC 3066  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
copyright
public static final URI copyright
- Type: Property 
 Label: copyright  
 Comment: Content copyright  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
created
public static final URI created
- Type: Property 
 Label: created  
 Comment: Date of creation of the DataObject. Note that this date refers to the creation of the DataObject itself (i.e. the physical representation). Compare with nie:contentCreated.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 Range: http://www.w3.org/2001/XMLSchema#dateTime  
 
lastModified
public static final URI lastModified
- Type: Property 
 Label: lastModified  
 Comment: Last modification date of the DataObject. Note that this date refers to the modification of the DataObject itself (i.e. the physical representation). Compare with nie:contentLastModified.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 Range: http://www.w3.org/2001/XMLSchema#dateTime  
 
mimeType
public static final URI mimeType
- Type: Property 
 Label: mimeType  
 Comment: The mime type of the resource, if available. Example: "text/plain". See http://www.iana.org/assignments/media-types/. This property applies to data objects that can be described with one mime type. In cases where the object as a whole has one mime type, while it's parts have other mime types, or there is no mime type that can be applied to the object as a whole, but some parts of the content have mime types - use more specific properties.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
version
public static final URI version
- Type: Property 
 Label: version  
 Comment: The current version of the given data object. Exact semantics is unspecified at this level. Use more specific subproperties if needed.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
interpretedAs
public static final URI interpretedAs
- Type: Property 
 Label: interpretedAs  
 Comment: Links the DataObject with the InformationElement it is interpreted as.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 
links
public static final URI links
- Type: Property 
 Label: links  
 Comment: A linking relation. A piece of content links/mentions a piece of data  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 
generator
public static final URI generator
- Type: Property 
 Label: generator  
 Comment: Software used to "generate" the contents. E.g. a word processor name.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
isPartOf
public static final URI isPartOf
- Type: Property 
 Label: isPartOf  
 Comment: Generic property used to express containment relationships between DataObjects. NIE extensions are encouraged to provide more specific subproperties of this one. It is advisable for actual instances of DataObjects to use those specific subproperties. Note to the developers: Please be aware of the distinction between containment relation and provenance. The isPartOf relation models physical containment, a nie:DataObject (e.g. an nfo:Attachment) is a 'physical' part of an nie:InformationElement (a nmo:Message). Also, please note the difference between physical containment (isPartOf) and logical containment (isLogicalPartOf) the former has more strict meaning. They may occur independently of each other.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 
disclaimer
public static final URI disclaimer
- Type: Property 
 Label: disclaimer  
 Comment: A disclaimer  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
generatorOption
public static final URI generatorOption
- Type: Property 
 Label: generatorOption  
 Comment: A common superproperty for all settings used by the generating software. This may include compression settings, algorithms, autosave, interlaced/non-interlaced etc. Note that this property has no range specified and therefore should not be used directly. Always use more specific properties.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 
description
public static final URI description
- Type: Property 
 Label: description  
 Comment: A textual description of the resource. This property may be used for any metadata fields that provide some meta-information or comment about a resource in the form of a passage of text. This property is not to be confused with nie:plainTextContent. Use more specific subproperties wherever possible.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
contentCreated
public static final URI contentCreated
- Type: Property 
 Label: contentCreated  
 Comment: The date of the content creation. This may not necessarily be equal to the date when the DataObject (i.e. the physical representation) itself was created. Compare with nie:created property.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#dateTime  
 
title
public static final URI title
- Type: Property 
 Label: title  
 Comment: Name given to an InformationElement  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
lastRefreshed
public static final URI lastRefreshed
- Type: Property 
 Label: lastRefreshed  
 Comment: Date when information about this data object was retrieved (for the first time) or last refreshed from the data source. This property is important for metadata extraction applications that don't receive any notifications of changes in the data source and have to poll it regularly. This may lead to information becoming out of date. In these cases this property may be used to determine the age of data, which is an important element of it's dependability.   
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 Range: http://www.w3.org/2001/XMLSchema#dateTime  
 
dataSource
public static final URI dataSource
- Type: Property 
 Label: dataSource  
 Comment: Marks the provenance of a DataObject, what source does a data object come from.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataSource  
 
depends
public static final URI depends
- Type: Property 
 Label: depends  
 Comment: Dependency relation. A piece of content depends on another piece of data in order to be properly understood/used/interpreted.  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 
contentLastModified
public static final URI contentLastModified
- Type: Property 
 Label: contentLastModified  
 Comment: The date of the last modification of the original content (not its corresponding DataObject or local copy). Compare with nie:lastModified.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#dateTime  
 
keyword
public static final URI keyword
- Type: Property 
 Label: keyword  
 Comment: Adapted DublinCore: The topic of the content of the resource, as keyword. No sentences here. Recommended best practice is to select a value from a controlled vocabulary or formal classification scheme.   
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
isLogicalPartOf
public static final URI isLogicalPartOf
- Type: Property 
 Label: isLogicalPartOf  
 Comment: Generic property used to express 'logical' containment relationships between DataObjects. NIE extensions are encouraged to provide more specific subproperties of this one. It is advisable for actual instances of InformationElement to use those specific subproperties. Note the difference between 'physical' containment (isPartOf) and logical containment (isLogicalPartOf)  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 
identifier
public static final URI identifier
- Type: Property 
 Label: identifier  
 Comment: An unambiguous reference to the InformationElement within a given context. Recommended best practice is to identify the resource by means of a string conforming to a formal identification system.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
plainTextContent
public static final URI plainTextContent
- Type: Property 
 Label: plainTextContent  
 Comment: Plain-text representation of the content of a InformationElement with all markup removed. The main purpose of this property is full-text indexing and search. Its exact content is considered application-specific. The user can make no assumptions about what is and what is not contained within. Applications should use more specific properties wherever possible.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
comment
public static final URI comment
- Type: Property 
 Label: comment  
 Comment: A user comment about an InformationElement.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
relatedTo
public static final URI relatedTo
- Type: Property 
 Label: relatedTo  
 Comment: A common superproperty for all relations between a piece of content and other pieces of data (which may be interpreted as other pieces of content).  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 
contentSize
public static final URI contentSize
- Type: Property 
 Label: contentSize  
 Comment: The size of the content. This property can be used whenever the size of the content of an InformationElement differs from the size of the DataObject. (e.g. because of compression, encoding, encryption or any other representation issues). The contentSize in expressed in bytes.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#integer  
 
license
public static final URI license
- Type: Property 
 Label: license  
 Comment: Terms and intellectual property rights licensing conditions.  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
subject
public static final URI subject
- Type: Property 
 Label: subject  
 Comment: An overall topic of the content of a InformationElement  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
coreGraph
public static final URI coreGraph
- Type: Property 
 Label: coreGraph  
 Comment: Connects the data object with the graph that contains information about it.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 Range: http://www.semanticdesktop.org/ontologies/2007/08/15/nrl#InstanceBase  
 
hasPart
public static final URI hasPart
- Type: Property 
 Label: hasPart  
 Comment: Generic property used to express 'physical' containment relationships between DataObjects. NIE extensions are encouraged to provide more specific subproperties of this one. It is advisable for actual instances of DataObjects to use those specific subproperties. Note to the developers: Please be aware of the distinction between containment relation and provenance. The hasPart relation models physical containment, an InformationElement (a nmo:Message) can have a 'physical' part (an nfo:Attachment).  Also, please note the difference between physical containment (hasPart) and logical containment (hasLogicalPart) the former has more strict meaning. They may occur independently of each other.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 
licenseType
public static final URI licenseType
- Type: Property 
 Label: licenseType  
 Comment: The type of the license. Possible values for this field may include "GPL", "BSD", "Creative Commons" etc.  
 Range: http://www.w3.org/2001/XMLSchema#string  
 
byteSize
public static final URI byteSize
- Type: Property 
 Label: byteSize  
 Comment: The overall size of the data object in bytes. That means the WHOLE data object and ONLY the data object, not of the content that is of interest to the user. For cases where the content size is different (e.g. in compressed files the content is larger, in messages the content excludes headings and is smaller) use more specific properties, not necessarily subproperties of this one.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 Range: http://www.w3.org/2001/XMLSchema#integer  
 
hasLogicalPart
public static final URI hasLogicalPart
- Type: Property 
 Label: hasLogicalPart  
 Comment: Generic property used to express 'logical' containment relationships between InformationElements. NIE extensions are encouraged to provide more specific subproperties of this one. It is advisable for actual instances of InformationElement to use those specific subproperties. Note the difference between 'physical' containment (hasPart) and logical containment (hasLogicalPart)  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 Range: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#InformationElement  
 
url
public static final URI url
- Type: Property 
 Label: url  
 Comment: URL of a DataObject. It points to the location of the object. A typial usage is FileDataObject. In cases where creating a simple file:// or http:// URL for a file is difficult (e.g. for files inside compressed archives) the applications are encouraged to use conventions defined by Apache Commons VFS Project at http://jakarta.apache.org/  commons/ vfs/ filesystems.html.  
 Domain: http://www.semanticdesktop.org/ontologies/2007/01/19/nie#DataObject  
 Range: http://www.w3.org/2000/01/rdf-schema#Resource  
 
NIE
public NIE()
getNIEOntology
public static void getNIEOntology(Model model)
- Puts the NIE ontology into the given model.
- Parameters:
 model - The model for the source ontology to be put into.
- Throws:
 Exception - if something goes wrong.
 
 
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