HARD 2004 Topics and Annotations

Item Name: HARD 2004 Topics and Annotations
Author(s): Stephanie Strassel, Meghan Glenn
LDC Catalog No.: LDC2005T29
ISBN: 1-58563-373-9
ISLRN: 721-717-066-331-5
DOI: https://doi.org/10.35111/8sx8-1q92
Release Date: December 20, 2005
Member Year(s): 2005
DCMI Type(s): Text
Data Source(s): newswire
Application(s): automatic content extraction, information detection, information extraction, information retrieval, topic detection and tracking
Language(s): English
Language ID(s): eng
License(s): LDC User Agreement for Non-Members
Online Documentation: LDC2005T29 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Strassel, Stephanie, and Meghan Glenn. HARD 2004 Topics and Annotations LDC2005T29. Web Download. Philadelphia: Linguistic Data Consortium, 2005.
Related Works: View


The HARD 2004 Text Corpus was developed by the Linguistic Data Consortium (LDC) and contains approximately 225 million tokens of English text.

This corpus contains source data for the 2004 TREC HARD (High Accuracy Retrieval from Documents) Evaluation. HARD 2004 was a track within the NIST Text REtrieval Conference (TREC), with the objective of achieving high accuracy retrieval from documents by leveraging additional information about the searcher and/or the search context, through techniques like passage retrieval and the use of targeted interaction with the searcher.

The current corpus was previously distributed to HARD Participants as LDC2004E30. The topics and annotations that correspond to this release are distributed as HARD 2004 Topics and Annotations (LDC2005T29). This corpus was created with support from the DARPA TIDES Program and LDC.


The corpus comprises eight English newswire and web text sources from January - December 2003. The sources and their volumes of data appear in the table below:

Source Code Stories Total Tokens Avg. Token/Story
Agence France Presse - English AFE 226,515 71,829,978 317
Associated Press Newswire APE 237,067 93,294,584 393
Central News Agency Taiwan - English CNE 3,674 797,194 217
Los Angeles Times/Washington Post LAT 18,287 12,576,721 687
New York Times NYT 28,190 16,673,028 591
Salon.com SLN 3,321 4,710,500 1,418
Ummah Press - English UME 2,607 782,064 299
Xinhua News Agency - English XIE 117,854 24,016,670 203
Totals   637,515 224,680,739  

Files are organized by source on a daily basis. Each file contains multiple documents identified by unique document IDs, in the form "SRCyyyymmdd.nnnn", where 'nnnn' is a sequential number starting from "0001" for each source/day. In addition, each document has some or all of the following components:

  • Keyword (optional), surrounded by tags
  • Date/time (optional), surrounded by tags
  • Headline, surrounded by tags
  • Main part, surrounded by tags. Tags are used within this part to identify paragraph boundaries.

For more information please visit the HARD Project website.


For an example of the data in this corpus, please view this sample (TXT).


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