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This group of capabilities focuses on enabling developers of composite services and applications to discover, compose, and invoke services. This includes the discovery of published services based on service metadata and the generation of client APIs in multiple languages to provide cross-platform access to existing services.
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The Semantic Infrastructure 2.0 provides the behavioral semantics required for dynamic composibility of services or generation of distributed queries. This includes runtime contract discovery and negotiation to determine composibility of services based on service capabilities and constraints.
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The Semantic Infrastructure 2.0 will provide a mechanism to specify policies, including business processing policies and related rules, compliance policies, and quality of service policies. Tools and services for creating security specific policies will be provided by the caGRID 2.0 platform and will be used by the semantic infrastructureSemantic Infrastructure. All other policies specified in the Semantic Infrastructure will be enforced by the platform at runtime.
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Policy and contract mechanisms in a Service-Oriented Architecture (SOA) ecosystem will require the following capabilities:
- decision procedures which must be able to measure and render decisions on constraints;
- enforcement of decisions;
- measurement and notification of obligation constraints;
- auditability of decisions, enforcement, and obligation measurements;
- administration of policy and contract language artifacts;
- storage of policies and contracts;
- distribution of policies /and contracts;
- conflict resolution or elevation of conflicts in policy rules;
- delegation of policy authority to agents acting on behalf of a client;
- decision procedures capable of incorporating roles and/or attributes for rendered decisions.
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- author, store, approve, validate, create, delete, edit, maintain policy;
- uniquely identified, visible, accessible, policy modules with metamodels and semantic annotation to describe the terms in the policy model, its functions, and its effects;
- discovery mechanisms for searching policies.
The wealth of data must be accessible, resulting in the need for exploration of available datasets. This includes the ability to view seamlessly across independent data sets, allowing a secondary user to integrate data from multiple sources. In addition, the query capability must support sophisticated queries such as temporal queries and spatial queries.
The semantic infrastructure will provide metadata for discovery of these datasets. Comples Complex temporal and spatial queries will be informed by the metadata but will be formulated and executed by the platform.
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