Features
- URI- and IRI-compatibility
- There is a specified way to express XRIs in the form of URIs
- Cross-references
- An XRI can contain another XRI (or a URI), to any level of nesting. This enables the construction of structured, "tagged" identifiers that enable identifier sharing across domains the same way XML enables data sharing across domains.
- Global context symbols
- These are single-character symbols (
=,@,+,$, or!) that provide a simple, human-friendly way to indicate the global context of an i-name or i-number. These are not required, but may be used within communities of interest that agree on their meaning and how they are resolved. - Peer-to-peer addressing
- XRI syntax supports the ability for any two network nodes to assign each other XRIs and perform cross-resolution. That is, a top-level namespace authority can be referred to by names assigned by other parties. This aids in federating namespaces between organizations or communities of interest.
- Decentralization
- XRIs can be rooted in either centralized addressing systems (e.g., IP addresses or DNS domain names) or private/decentralized root authorities and peer-to-peer addressing.
- Delegation
- Namespaces can be delegated to other namespace authorities.
- Federation
- Namespaces defined separately at any level can be joined together (in a hierarchical or polyarchical fashion) and made visible and resolvable.
- Persistence
- The ability to express the intent that parts (or all) of an XRI are permanent identifiers that will never be reassigned.
- Human- and machine-friendly formats
- XRI provides syntax both for identifiers that can be created and understood by humans easily (i-names), and those that are optimized for machine structuring/parsing (i-numbers).
- Simple, extensible resolution
- XRI offers a lightweight resolution scheme using HTTP and a simple XML document format called XRDS.
- Trusted resolution
- The XRI resolution protocol includes three modes of trusted version: a) HTTPS, b) SAML assertions, and c) both.
- Multiple resolution options
- XRI resolution can be independent of DNS.
- Fully internationalizable
- Leverage existing Unicode and IRI specifications.
- Transport independent
- XRIs are independent of specific transport protocols or mechanisms.
Read more about this topic: XRI
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