| A Large-Scale Real-World Dataset for Structured Web Date Extraction |
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| 1.Motivation |
| This dataset is a real-world web page collection used for research on the automatic extraction of structured data (e.g., attribute-value pairs of entities) from the Web. We hope it could serve as a useful benchmark for evaluating and comparing different methods for structured web data extraction. |
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| 2.Contents of the Dataset |
| Currently the dataset involves: |
| a) 8 verticals with diverse semantics; |
| b) 80 web sites (10 per vertical); |
| c) 124,291 web pages (200~2,000 per web site), each containing a single data record with detailed information of an entity; |
| d) 32 attributes (3~5 per vertical) associated with carefully labeled ground-truth of corresponding values in each web page. The goal of structured data extraction is to automatically identify the values of these attributes from web pages. |
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| The involved verticals are summarized as follows: |
| Vertical #Sites #Pages #Attributes Attributes |
| Auto 10 17,923 4 model, price, engine, fuel_economy |
| Book 10 20,000 5 title, author, isbn_13, publisher, publication_date |
| Camera 10 5,258 3 model, price, manufacturer |
| Job 10 20,000 4 title, company, location, date_posted |
| Movie 10 20,000 4 title, director, genre, mpaa_rating |
| NBA Player 10 4,405 4 name, team, height, weight |
| Restaurant 10 20,000 4 name, address, phone, cuisine |
| University 10 16,705 4 name, phone, website, type |
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| 3.Format of Web Pages |
| Each web page in the dataset is stored as one .htm file (in UTF-8 encoding) where the first tag encodes the source URL of the page. |
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| 4.Format of Ground-truth Files |
| For each web site, the page-level ground-truth of attribute values has been labeled using handcrafted regular expressions and stored in .txt files (in UTF-8 encoding) named as "<vertical>-<site>-<attribute>.txt". |
| In each such file: |
| a) The first line stores the names of vertical, site, and attribute, separated by TAB characters ('\t'). |
| b) The second line stores some statistics (separated by TABs) w.r.t. the corresponding site and attribute, including: |
| [1] the total number of pages, |
| [2] the number of pages containing attribute values, |
| [3] the total number of attribute values contained in the pages, |
| [4] the number of unique attribute values. |
| c) Each remaining line stores the ground-truth information (separated by TABs) of one page, in sequence of: |
| [1] page ID, |
| [2] the number of attribute values in the page, |
| [3] attribute values ("<NULL>" in case of non-existence). |
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| 5.Notes on Ground-truth Labeling |
| a) The ground-truth labeling was conducted in the DOM-node level. More specifically, the candidate attribute values in a web page are the non-empty strings contained in text nodes in the corresponding DOM tree. |
| b) One page (although containing a single data record) may contain multiple distinct values that correspond to an attribute (e.g., multiple authors of a book, multiple granularity levels of addresses). |
| c) Currently, when a text node presents a mixture of multiple attributes, its string value is labeled with each of these attributes, if no substitute is available. |
| d) Before being stored in .txt files, the raw attribute values were refined by removing redundant separators (e.g., ' ', '\t', '\n'). |
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| 6.Support |
| If you have questions about this dataset, please contact Qiang Hao (haoq@live.com). |
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