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TWiki> Main Web>AmHome>AmLinkTypeHints (30 Jan 2012, JimConallen)

Link Type Hints

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It was proposed off line recently that we can extend the link types resource to include information about what rdf:type(s) are expected on either end of a link. While not restrictive this information could be used by clients in user interfaces to suggest appropriate link types when a source resource is in context. When selecting the target end of a link it might be used to provide additional filtering (if not using delegated UI and using OSLC simple query instead).

The proposal is that we allow two new properties on a link type resource; oslc_am:sourceHint and oslc_am:targetHint. These are multivalued properties that reference rdf:type URIs that can be expected on either end of a link with that type.

The motivation is to 1) provide service implementer UIs with an oppertunity to short list link types when presenting options to a user creating a new link type. 2) provide clients with some expectation as to what types of resource can be found on the other end of a link.

The proposed extended link type resource is:

Resource: Link Type Resource (LTR)[extended]

A Link Type Resource (LTR) represents type of link that is or can be used when defining links from AM resources. The type has an ID (expressed as a URI), whose universally accepted semantics may be defined elsewhere. This resource represents the definition as it is used by this service provider. This resource is meant as a convenience for clients to get a list of known/registered link types with human readable labels and definitions that can be used in client user interfaces when links are being created.

  • Name: LinkType
  • Type URI http://open-services.net/ns/am#LinkType

Prefixed Name Occurs Read-only Value-type Represen-tation Range Description
dcterms:title exactly-one unspecified XMLLiteral n/a n/a Title (reference: Dublin Core) of the resource represented as rich text in XHTML content. 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 <span> element.
dcterms:identifier exactly-one unspecified String n/a n/a A unique identifier for a resource. Assigned by the service provider when a resource is created. Not intended for end-user display.
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 <div> element.
oslc_am:sourceHint zero-or-many unspecified Resource Reference any An expected, or at least possible resource type that a client might expect to see on the owning end (RDF subject) of an instance of this link type.
oslc_am:targetHint zero-or-many unspecified Resource Reference any An expected or at least possible resource type that a client might expect to see on the target end (RDF object) of an instance of this link type.
dcterms:creator zero-or-many unspecified Resource Either any Creator or creators of resource (reference: Dublin Core). It is likely that the target resource will be an foaf:Person but that is not necessarily the case.
dcterms:contributor zero-or-many unspecified Resource Either any Constributor or contributors of resource (reference: Dublin Core). It is likely that the target resource will be an 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 last latest resource modification (reference: Dublin Core).
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.

AM Service Provider Capabilities

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Topic revision: r3 - 30 Jan 2012 - 18:14:34 - JimConallen
 
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