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Open Services for Lifecycle Collaboration
Asset Management Specification Version 2.0

2.0 FINALIZATION DRAFT. This current draft is intended for review during finalization. You can help by reviewing it carefully and raising issues for discussion on the OSLC Asset Management mailing list. For issues regarding this specification and their resolution, see AssetMgSpecificationV2Issues. The specification will be final once the first Asset Management provider implementation is completed. This is currently in progress and scheduled for completion in March 2012.

Status: 2.0 Specification - March 12th, 2012

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Table of Contents

License

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This work is licensed under a Creative Commons Attribution License.

Notation and Conventions

The key words “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” in this document are to be interpreted as described in RFC2119. Domain name examples use RFC2606.

Introduction

Asset management systems allow enterprises to catalog, govern, manage, search for, and maintain assets. An asset is anything tangible or intangible that is capable of being owned or controlled to produce value. Example assets may include but are not limited to binary output from a software development process, documentation, presentations, hardware, automobiles, buildings, pumps, etc. Assets should referenced or reused by a wide audience over an extended period of time and benefit from being formally cataloged in a way that allows them to be monitored and maintained. Change to assets is usually managed through a formal governance process.

Assets are described by a set of properties and zero or more artifacts. An artifact is a file of any type and a set of properties that describe the file.

This specification builds on the Open Services for Lifecycle Collaboration (OSLC) Core v2.0 Specification to define the resources, properties and operations supported by an OSLC Asset Management (OSLC-Asset) provider. Asset Management resources include Assets, Artifacts and supporting resources defined in the OSLC Core specification. The properties defined describe these resources and the relationships between resources. Operations are defined in terms of HTTP methods and MIME type handling. The resources, properties and operations defined do not form a comprehensive interface to Asset Management, but instead target specific integration use cases documented by the OSLC-Asset workgroup.

This specification also defines how Assets and Artifacts are represented in OSLC Services. The Asset Resource is a set of properties for an Asset, and includes properties that describe Artifacts of an Asset.

Asset Management Resources Overview

This version of the OSLC Asset specification is demonstrated in the version 2.0 samples

Terminology

Asset Consumer - A tool or user that performs asset searching and retrieval activities outlined in the search and retrieve scenarios.

Asset Resource - An Asset Resource has a set of properties representing an asset. These properties include such things as name, description, classification, and the Artifact properties for an Asset.

Asset Query Resource - When filtering using simple query, the representation of a list of Asset Resources.

Asset Submitter - A tool or user that performs asset preparation activities outlined in the publish scenario.

Artifact - This term refers to the properties that describe an Asset Artifact and potentially the Artifact Media referenced by this Artifact. An Asset may have zero or more Artifacts.

Artifact Media Resource - The Artifact Media Resource represents the actual artifact content. The content can be a presentation, a test case, a binary software component, or any other kind of file.

Property - An attribute of a resource. Typically a property is a name/value pair that describes a certain aspect of the resource. For example, an asset has many properties such as the asset title, subject/short description, version.

Service Provider - An implementation of the OSLC Asset Management specification as a server. OSLC Asset Management clients consume these services.

Work product - This term is often used interchangeably with 'artifact' or 'file'. An asset may have zero or more work products.

Base Requirements

Compliance

This specification is based on OSLC Core Specification. OSLC Asset Management 2.0 consumers and service providers MUST be compliant with both the core specification and this Asset Management specification, and SHOULD follow all the guidelines and recommendations in both these specifications.

The following table summarizes the requirements from OSLC Core Specification as well as some additional specific to Asset Management. Note that this specification further restricts some of the requirements for OSLC Core Specification. See further sections in this specification or the OSLC Core Specification to get further details on each of these requirements.

Requirement Level Meaning
Unknown properties and content MAY / MUST OSLC services MAY ignore unknown content and OSLC clients MUST preserve unknown content
Resource Operations MUST OSLC service MUST support resource operations via standard HTTP operations
Resource Paging MAY OSLC services MAY provide paging for resources but only when specifically requested by client
Partial Resource Representations MAY / MUST OSLC services MUST support request for a subset of a resource's properties via the oslc.properties URL parameter retrieval via HTTP GET and MAY support via HTTP PUT
Partial Update MAY OSLC services MAY support partial update of resources using patch semantics
Service Provider Resources MAY / MUST OSLC service providers MAY provide a Service Provider Catalog and MUST provide a Service Provider resource
Creation Factories MUST OSLC service providers MUST provide creation factories to enable resource creation via HTTP POST
Query Capabilities MUST OSLC service providers MUST provide query capabilities to enable clients to query for resources
Query Syntax MUST OSLC query capabilities MUST support the OSLC Core Query Syntax and MAY use other query syntax
Delegated UI Dialogs MUST OSLC Services MUST offer delegated UI dialogs (creation and selections) specified via service provider resource
UI Preview SHOULD OSLC Services SHOULD offer UI previews for resources that may be referenced by other resources
HTTP Basic Authentication MAY OSLC Services MAY support Basic Auth and should do so only over HTTPS
OAuth Authentication SHOULD OSLC Services SHOULD support OAuth and can indicate the required OAuth URLs via the service provider resource
Error Responses MAY OSLC Services MAY provide error responses using Core defined error formats
RDF/XML Representations MUST OSLC services MUST provide an RDF/XML representation for HTTP GET requests and MUST support RDF/XML representations on POST and PUT requests.
XML Representations MAY OSLC services MAY provide a XML representation for HTTP GET, POST and PUT requests that conform to the Core Guidelines for XML.
JSON Representations SHOULD OSLC services SHOULD provide JSON representations for HTTP GET, POST and PUT requests that conform to the Core Guidelines for JSON
HTML Representations SHOULD OSLC services SHOULD provide HTML representations for HTTP GET requests

Specification Versioning

See OSLC Core Specification Versioning section.

Service providers that support the resource formats and services in this specification MUST use HTTP response header of OSLC-Core-Version with a value of 2.0 and OSLC-Asset-Version with a value of 2.0. Consumers MAY request formats and services defined in this document by providing a HTTP request header of OSLC-Core-Version with a value of 2.0. See section below on Version Compatibility with OSLC Asset 1.0 Specifications.

Namespaces

In addition to the namespace URIs and namespace prefixes oslc, rdf, dcterms and foaf defined in the OSLC Core specification, OSLC Asset Management defines the namespace URI of http://open-services.net/ns/asset# with a namespace prefix of oslc_asset

Resource Formats

In addition to the requirements for OSLC Core Resource Formats section, this section outlines further refinements and restrictions.

For HTTP GET requests on all OSLC Asset Management and OSLC Core defined resource types,

  • Asset Management Providers MUST provide RDF/XML representations, SHOULD provide JSON representations, and MAY provide XML representations. The XML and JSON representations SHOULD follow the guidelines outlined in the OSLC Core Representations Guidance.
  • Asset Management Consumers requesting RDF/XML SHOULD be prepared for any valid RDF/XML document. Asset Management Consumers requesting XML or JSON SHOULD be prepared for representations that follow the guidelines outlined in the OSLC Core Representations Guidance.
  • Asset Management Providers SHOULD support an [X]HTML representation and a user interface (UI) preview as defined by UI Preview Guidance

For HTTP PUT/POST request formats for resource type of Asset:

  • Asset Management Providers MUST accept RDF/XML representations, SHOULD accept JSON representations, and MAY accept XML representations. Asset Management Providers accepting RDF/XML SHOULD be prepared for any valid RDF/XML document. For XML or JSON, Asset Management Providers SHOULD be prepared for representations that follow the guidelines outlined in the OSLC Core Representations Guidance.

For HTTP GET response formats for Query requests,

Asset Management Providers MUST provide RDF/XML representations, SHOULD provide JSON and Atom Syndication Format XML representations, and MAY provide XML representations.

When Asset Management Consumers request:

  • application/rdf+xml Asset Management Providers MUST respond with RDF/XML representation without restrictions.
  • application/json Asset Management Providers SHOULD respond with JSON representation as defined in the OSLC Core Representations Guidance.
  • application/xml Asset Management Provider MAY respond with OSLC-defined abbreviated XML representation as defined in the OSLC Core Representations Guidance
  • application/atom+xml Asset Management Provider SHOULD respond with Atom Syndication Format XML representation as defined in the OSLC Core Representations Guidance
  • The Atom Syndication Format XML representation SHOULD use RDF/XML representation without restrictions for the atom:content entries representing the resource representations.

See Query Capabilities for additional information when Resource Shapes affect representation.

Content Negotiation

OSLC Core Guidance clearly points to RDF representations (and specifically RDF/XML) as a convention that all OSLC Provider implementations minimally provide and accept. OSLC Asset Provider implementations are strongly encouraged to adopt this convention. Future versions of this specification are expected to require RDF representations for all operations and relax requirements for specialized XML representations.

XML Representation - identified by the application/xml content type. Format representation rules are outlined in Core OSLC Core Resource Formats section

RDF/XML Representation - identified by the application/rdf+xml content type. No additional guidance is given. The OSLC Core describes an algorithm for generating consistent formats that are used as examples only.

JSON Representation - identified by the application/json content type. Format representation rules are outlined in Core OSLC Core Resource Formats section.

Atom Syndication Format XML Representation - identified by the application/atom+xml content type. Format representation rules are outlined in Core OSLC Core Resource Formats section.

Authentication

See OSLC Core Authentication section. Asset Management puts no additional constraints on authentication.

Error Responses

See OSLC Core Error Responses section. Asset Management puts no additional constraints on error responses.

Pagination

OSLC Asset service providers SHOULD support pagination of query results and MAY support pagination of a single resource's properties as defined by the OSLC Core Specification.

Requesting and Updating Properties

Requesting a Subset of Properties

A client MAY request a subset of a resource's properties as well as properties from a referenced resource. In order to support this behavior a service provider MUST support the oslc.properties and oslc.prefix URL parameter on a HTTP GET request on individual resource request or a collection of resources by query. If the oslc.properties parameter is omitted on the request, then all resource properties MUST be provided in the response.

Updating a Subset of Properties

A client MAY request that a subset of a resource's properties be updated by identifying those properties to be modified using the oslc.properties URL parameter on a HTTP PUT request.

If the parameter oslc.properties contains a valid resource property on the request that is not provided in the content, the server MUST set the resource's property to a null or empty value. If the parameter oslc.properties contains an invalid resource property, then a 409 Conflict MUST be returned.

Labels for Relationships

Asset relationships to other resources are represented as properties whose values are the URI of the object or target resource. When an Asset relationship property is to be presented in a user interface, it may be helpful to provide an informative and useful textual label for that relationship instance. (This in addition to the relationship property URI and the object resource URI, which are also candidates for presentation to a user.) To this end, OSLC providers MAY support a dcterms:title link property in Asset resource representations, using the anchor approach outlined in the OSLC Core Links Guidance. In addition to the textual label, the Asset resource definition defines several properties that can be used to describe the relationship from one Asset resource to another Asset resource.

RDF/XML and XML example using reified statement: 

<rdf:RDF 
     xmlns:dcterms="http://purl.org/dc/terms/" 
     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:oslc_asset="http://open-services.net/ns/asset#">

    <oslc_asset:Asset rdf:about="http://example.com/assets/CDFE4153-9271-5CA6-425A-4CA6BE7BD7CA/1.0">
         <dcterms:relation rdf:ID="relationship1" rdf:resource="http://example.com/assets/52C4702C-7CA2-E46E-D373-620482ECBEED/1.0"/>
    </oslc_asset:Asset>

    <rdf:Description rdf:about="#relationship1">
        <dcterms:title>Build Configuration</dcterms:title>
   </rdf:Description>
</rdf:RDF>

Custom Properties

Asset management providers SHOULD allow consumers to define custom properties. If providers allow consumers to define custom properties, they MUST allow the consumer to optionally specify an HTTP URI for that data element, and the specified URI MUST be used in the RDF representation of all resources that contain the data element. The specified URI MAY be part of an industry standard such as DC, FOAF, or OSLC, or it MAY be defined by the user's organization. If the URI is defined by the user's organization, then they SHOULD make it dereferencable as per the W3C Best Practices for Publishing RDF Vocabularies.

If the user does not specify the optional URI, then the provider MUST use a default generated HTTP URI. The generated URI SHOULD be as human-readable as possible. One method for achieving human-readability is to apply a human-friendly name mangling algorithm to the user-defined label for the data element. The tool SHOULD make the generated URI dereferencable as per the W3C Best Practices for Publishing RDF Vocabularies. The published RDF vocabulary SHOULD include any relevant descriptive information provided the user as part of the data element definition, e.g. the label and description.

OSLC Asset Management Resource Definitions

Asset

An Asset is anything tangible or intangible that is capable of being owned or controlled to produce value, and is held to have positive economic value. This includes not only software products, but also buildings, servers, automobiles, pumps, oil wells, etc. These properties include such things as name, description, classification, and the Artifact properties of an Asset.

The Asset resource properties are not limited to the ones defined in this specification, service providers may provide additional properties. It is recommended that any additional properties exist in their own unique namespace and not use the namespaces defined in these specifications.

  • Name: Asset
  • Type URI http://open-services.net/ns/asset#Asset

Prefixed Name Occurs Read-only Value-type Representation Range Description
OSLC Core: Common Properties
dcterms:identifier zero-or-one True String n/a n/a A unique identifier for a resource. Assigned by the service provider when a resource is created.
dcterms:title exactly-one unspecified XMLLiteral n/a n/a Short name identifying a resource, often used as an abbreviated identifier for presentation to end-users. SHOULD include only content that is valid inside an XHTML element.
dcterms:description zero-or-one unspecified XMLLiteral n/a n/a Descriptive text (reference: Dublin Core) about resource represented as rich text in XHTML content. SHOULD include only content that is valid and suitable inside an XHTML element.
dcterms:creator zero-or-many unspecified Either Resource or Local Resource Either Reference or Inline any Creator or creators of resource (reference: Dublin Core). It is likely that the target resource will be a foaf:Person but that is not necessarily the case
dcterms:contributor zero-or-many unspecified Either Resource or Local Resource Either Reference or Inline any The person(s) who are responsible for this asset. (reference: Dublin Core). It is likely that the target resource will be a foaf:Person but that is not necessarily the case.
dcterms:created zero-or-one True DateTime n/a n/a Timestamp of resource creation (reference: Dublin Core).
dcterms:modified zero-or-one True DateTime n/a n/a Timestamp latest resource modification (reference: Dublin Core).
rdf:type zero-or-many unspecified Resource Reference n/a The resource type URIs. One reference should have the value of http://open-services.net/ns/asset#Asset.
oslc:serviceProvider zero-or-many unspecified Resource Reference oslc:ServiceProvider The scope of a resource is a URI for the resource's OSLC Service Provider.
oslc:instanceShape zero-or-one unspecified Resource Reference oslc:ResourceShape Resource Shape that provides hints as to resource property value-types and allowed values.
Prefixed Name Occurs Read-only Value-type Representation Range Description
OSLC Asset: Start of additional properties
oslc_asset:guid zero-or-one unspecified String n/a n/a An identifier for the asset. Assigned by the service provider when a resource is created. Different versions of the same asset will share the same identifier.
oslc_asset:version zero-or-one unspecified String n/a n/a The version of the asset. Possible values may include '1.0', '2.0', etc.
dcterms:abstract zero-or-one unspecified XMLLiteral n/a n/a Short description (reference: Dublin Core) or often a single line summary of the resource
dcterms:type zero-or-one unspecified Resource Reference n/a The type of the asset based on values defined by the service provider. This specification does not define the resource for this property, however it should contain a dcterms:title property.
oslc_asset:state zero-or-one unspecified Either Resource or Local Resource Either Reference or Inline any Used to indicate the state of the asset based on values defined by the service provider. This specification does not define the resource for this property, however it should contain a dcterms:title property.
oslc_asset:categorization zero-or-many unspecified Either Resource or Local Resource Either Reference or Inline any A categorization to classify an asset. The category schema values are defined by the service provider. This specification does not define the resource for this property, however it should contain a dcterms:title property.
oslc_asset:manufacturer zero-or-one unspecified String n/a n/a The name of the asset manufacturer.
oslc_asset:model zero-or-one unspecified String n/a n/a The value of the asset model.
oslc_asset:serialNumber zero-or-one unspecified String n/a n/a The serial number assigned by the asset manufacturer.
oslc_asset:tag zero-or-many unspecified String n/a n/a Specifies the asset tag value for an Asset. Asset tags are typically human readable labels. For hardware assets, these tags are durable, securely attached to equipment, and may also be readable by barcode and/or RFID.
oslc_asset:artifact zero-or-many unspecified Local Resource Inline oslc_asset:Artifact An Artifact fragment contained in this Asset resource.
oslc_asset:artifactFactory exactly-one unspecified Resource Reference any Resource URI used to post new artifacts to the asset.
Prefixed Name Occurs Read-only Value-type Representation Range Description
Relationship Properties: This grouping of properties are used to identify relationships between resources managed by the current or other OSLC Service Providers
dcterms:relation zero-or-many False Resource Reference any This relationship is loosely coupled and has no specific meaning. Details about this relationship may be included in a reified statement.
Prefixed Name Occurs Read-only Value-type Representation Range Description
Related Resource Reified Statement Properties: This grouping of properties is used to provide additional details about a relationship in a reified statement
oslc_asset:relationshipType zero-or-one unspecified Either Resource or Local Resource Either Reference or Inline any The type of this relationship from the perspective of the dcterms:relation resource based on values defined by the service provider. This specification does not define the resource for this property, however it should contain a dcterms:title property.
dcterms:creator zero-or-many unspecified Either Resource or Local Resource Either Reference or Inline any Creator or creators of the relationship (reference: Dublin Core). It is likely that the target resource will be a foaf:Person but that is not necessarily the case.
dcterms:created zero-or-one True DateTime n/a n/a Timestamp of the relationship creation (reference: Dublin Core).
dcterms:modified zero-or-one True DateTime n/a n/a Timestamp of the latest relationship modification (reference: Dublin Core).
oslc_asset:state zero-or-one unspecified Either Resource or Local Resource Either Reference or Inline any Used to indicate the state of the relationship based on values defined by the service provider. This specification does not define the resource for this property, however it should contain a dcterms:title property.

Artifact

An Artifact is a fragment within an asset resource that describes an Artifact Media Resource. An artifact fragment may only be updated though an Asset resource and it is not possible to perform operations directly on the Artifact fragment

The Artifact fragment properties are not limited to the ones defined in this specification, service providers may provide additional properties. It is recommended that any additional properties exist in their own unique namespace and not use the namespaces defined in these specifications.

  • Name: Artifact
  • Type URI http://open-services.net/ns/asset#Artifact

Prefixed Name Occurs Read-only Value-type Representation Range Description
OSLC Artifact Fragment: The grouping of properties that define an artifact
rdf:type zero-or-many unspecified Resource Reference n/a The resource type URIs. One reference should have the value of http://open-services.net/ns/asset#Artifact.
dcterms:title exactly-one unspecified XMLLiteral n/a n/a The name of the artifact. Title (reference: Dublin Core) of the resource represented in text XHTML content. SHOULD include only content that is valid inside an XHTML element.
oslc:label zero-or-one unspecified XMLLiteral n/a n/a The label of the artifact. Subject (reference: Dublin Core) an abbreviated presentation for the end-users. SHOULD include only content that is valid inside an XHTML element.
oslc_asset:content exactly-one unspecified Resource Reference Artifact Media The media resource reference URI (the artifact bytes).
dcterms:format zero-or-one unspecified String n/a n/a The mime type of the artifact media resource.
oslc_asset:size zero-or-one True Integer n/a n/a The size of the artifact media resource in bytes.
dcterms:created zero-or-one True DateTime n/a n/a Timestamp of resource creation (reference: Dublin Core).
dcterms:modified zero-or-one True DateTime n/a n/a Timestamp last latest resource modification (reference: Dublin Core).

Artifact Media

The artifact media represents the actual content of an artifact. The URI for the artifact media resource is defined by the oslc_asset:content property of an artifact fragment within an asset resource.

A client may publish a new artifact to an asset making a POST request to the asset's artifact factory URI as defined by the oslc_asset:artifactFactory property of the asset resource. The request MUST contain an oslc_asset.name header indicating the path and name of the new artifact and the body of the POST MUST contain the contents of the artifact. A successful response from the provider MUST return a status code of 201 and a Location Header indicating the URI of the Media Resource. In addition, the provider MUST add a new artifact fragment to the asset and fill in the mandatory properties including size, and creation time. The client may later update the non-read only properties of this fragment.

See the Publish an artifact sample for additional details.

Providers MUST also support URI artifacts. URI artifacts do not contain content, but instead the oslc_asset:content property's value is a URI external to the asset. To create a URI artifact, clients POST an artifact resource to the artifact factory URI. The request MUST contain an oslc_asset.name header indicating the path and name of the new artifact URI. A successful response from the provider MUST return a status code of 201 and a Location Header indicating the URI of the artifact URI. In addition, the provider MUST add a new artifact fragment to the asset and fill in the mandatory properties such as creation time. The client may later update the non-read only properties of this fragment.

See the Publish a URI artifact sample for additional details.

Asset Management Service Provider Capabilities

Service Discovery and Description

OSLC Asset Management service providers MUST provide a Service Provider Resource that can be retrieved at a implementation dependent URI.

OSLC Asset Management service providers MAY provide a Service Provider Catalog Resource that can be retrieved at a implementation dependent URI.

OSLC Asset Management service providers MUST provide a oslc:serviceProvider property for their defined resources that will be the URI to a Service Provider Resource.

OSLC Asset Management service providers MUST supply a value of http://open-services.net/ns/asset# for the property oslc:domain on either oslc:Service or oslc:ServiceProviderCatalog resources.

Creation Factories

OSLC Asset Management service providers MUST support Creation Factories and list them in the Service Provider Resource as defined by OSLC Core. OSLC Asset Management service providers SHOULD support Resource Shapes for Creation Factories as defined in OSLC Core Specification

Query Capabilities

OSLC Asset Management service providers MUST support the Query Capabilities as defined by OSLC Core. OSLC Asset Management service providers SHOULD support Resource Shapes for Query Capability as defined in OSLC Core Specification

The Query Capability MUST support these parameters:

  • oslc.where
  • oslc.select
  • oslc.properties
  • oslc.prefix

If shape information is NOT present with the Query Capability, service providers SHOULD use these default properties to contain the result:

Delegated User Interface Dialogs

OSLC Asset Management service providers SHOULD support the selection of resources by delegated web-based user interface dialogs Delegated UIs as defined by OSLC Core.

OSLC Asset Management service providers MAY support the creation of resources by delegated web-based user interface dialogs Delegated UIs as defined by OSLC Core.

OSLC Asset Management service providers MAY support the pre-filling of creation dialogs based on the definition at Delegated UIs.

The service providers supports the delegated UIs as follows:

Asset Management Resource Selection Creation
Asset SHOULD MAY

Version Compatibility with 1.0 Specifications

The goal is to provide a smooth transition to 2.0 for both Consumers and Providers. This section will clarify the usage of 1.0 media types so that Providers can support both 1.0 and 2.0 Consumers when HTTP requests are made for a resource with the same URI.

Media Types

For an Asset Resource format identification of RDF/XML and XML, the media type used for this representation SHOULD be application/rdf+xml or application/xml.

For an Asset Resource format identification of JSON, the media type used for this representation SHOULD be application/json.

Appendix A: Samples

(this section is informative)

See AssetMgSpecificationV2Samples

Appendix B: Resource Shapes

(this section is informative)

See AssetMgSpecificationV2Shapes

Appendix C: Notices and References

Contributors

Reporting Issues on the Specification

The working group participants who author and maintain this working draft specification, monitor a distribution list where issues or questions can be raised, see Asset Management Mailing List

Also the issues found with this specification and their resolution can be found at AssetMgSpecificationV2Issues

Intellectual Property Covenant

The members of the Working Group (or as appropriate, their employers) have documented a Patent Non-Assertion Covenant for implementations of the Asset Management 2.0 Specification, as described in the open-services.net Terms of Use. Details of the Covenant may be found here.

References

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Topic revision: r103 - 10 Apr 2012 - 14:56:57 - SheehanAnderson
Main.AssetMgSpecificationV2 moved from Main.AssetMgRestApiV2 on 03 Aug 2010 - 12:52 by ScottBosworth - put it back
 
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