Overview
SIST ISO 24617-1:2013 (identical to ISO 24617-1:2012) - part of the Semantic Annotation Framework (SemAF) - defines SemAF-Time / ISO-TimeML, an XML-based, formalized markup language for representing temporal information in natural language texts. The standard specifies a structured approach to temporal annotation (times, events, relations) to support consistent extraction, exchange and interpretation of time-related information across language-processing systems and annotation schemes. Practical grounding and examples are provided from the TimeBank corpus (183 annotated documents).
Key technical topics and requirements
- Definition of a metamodel and an abstract syntax for temporal concepts (times, events, signals).
- A concrete XML-based syntax (ISO-TimeML) and naming conventions for stand-off annotations.
- Core annotation elements:
- ****, ****, ****
- Link elements: ****, ****, ****, **** for temporal, subordinating, aspectual and modal links
- Attributes and support tags (****, ****, ****)
- Semantics coverage:
- Interval-based and event-based semantic models for interpreting TIMEX and EVENT annotations
- Treatment of tense, aspect, modality and temporal relations
- Normative and informative annexes:
- Core annotation guidelines and element attribute specifications
- Language-specific guidance (examples for Chinese, Italian, Korean)
- Tools, templates and toolkits (annotation/editor tool references)
- Specification annex with attribute classes and requirements
- Emphasis on interoperability: designed to facilitate exchange between operational NLP systems and different temporal representation schemes.
Practical applications and users
Who benefits:
- NLP researchers and corpus linguists creating temporally annotated corpora
- Developers of temporal information extraction, timeline generation, question answering, event detection, and summarization systems
- Industry applications in finance, legal, clinical informatics, digital humanities and news analytics that require accurate temporal reasoning
- Tool and annotation platform builders integrating standardized XML temporal markup
Why use it:
- Ensures consistent representation of times/events across datasets and tools
- Enables better temporal reasoning, comparison of annotation schemes, and system interoperability
- Leverages established examples (TimeBank) and language-specific guidelines to accelerate annotation projects
Related standards
- Part of the ISO 24617 (SemAF) series - ISO 24617-1 is the Time and Events component (SemAF-Time / ISO-TimeML). Use alongside complementary SemAF parts when broader semantic annotation needs arise.
Keywords: ISO 24617-1, SemAF-Time, ISO-TimeML, temporal annotation, TimeML, TimeBank, temporal information extraction, XML markup, semantic annotation framework, NLP.
