# Guiding questions

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**Note:** This page is currently being updated to align with the DSSC Blueprint 3.0 as well as the iSHARE Framework 3.0. An updated version will be published soon.
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**Purpose:** Identify core transmission protocols and sector-specific APIs that enable seamless data exchange.
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1. **Protocol Selection**

* *Which generic transmission protocols (e.g., REST/HTTP, NGSI-LD, LDES, MQTT) should be adopted?*
* *Which domain-specific APIs are required for sectoral use cases?*
* *Should a “preferred protocol set” be provided for faster onboarding?*
* *Are Event Streaming (HTTPS or MQTT), IDSCP, or Protocol Buffers used for transmission?*

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**Purpose:** Define when data should be exchanged via push, pull, streaming, or batch transfers to meet diverse use cases.
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2. **Modes of Exchange**

* *Will data be exchanged as push (provider sends) or pull (consumer requests), or both?*
* *Which scenarios require continuous streaming versus finite batch transfers?*
* *How will real-time updates and triggered exchanges be handled?*

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**Purpose:** Ensure protocols are aligned with semantic models and discoverable through catalogs.
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3. **Integration with Semantics & Discovery**

* *How will protocols link to the agreed semantic data models?*
* *How will API specifications and protocol details be published for discoverability?*

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**Purpose:** Implement mechanisms for ensuring accuracy, resilience, and compatibility in data transfers.
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4. **Quality & Reliability**

* *How will completeness and accuracy of data transfers be ensured?*
* *What mechanisms for error handling, reconnection, and version compatibility will be in place?*

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**Purpose:** Guarantee interoperability with other EU data spaces through shared protocols and a common inventory.
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5. **Federation Readiness**

* *How will interoperability with other EU data spaces’ protocols be ensured?*
* *Will a shared “protocol inventory” be maintained for federated connections?*