{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:NGB76MZMLZNSNTBT3TTAHITTH7","short_pith_number":"pith:NGB76MZM","canonical_record":{"source":{"id":"1712.08198","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DB","submitted_at":"2017-12-21T20:22:47Z","cross_cats_sorted":[],"title_canon_sha256":"8f0e9ed6f67093c280cc55c7ad52d0b2651c1704c97c97e7633fec32615af7fa","abstract_canon_sha256":"7c0e9b2d762eae0fdbcf9d9721b8e1dcda7c9c4bc71a85e21995226f3ed71a4f"},"schema_version":"1.0"},"canonical_sha256":"6983ff332c5e5b26cc33dce603a2733fd94e793a55d589616e758269c87cddca","source":{"kind":"arxiv","id":"1712.08198","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1712.08198","created_at":"2026-05-18T00:15:09Z"},{"alias_kind":"arxiv_version","alias_value":"1712.08198v3","created_at":"2026-05-18T00:15:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1712.08198","created_at":"2026-05-18T00:15:09Z"},{"alias_kind":"pith_short_12","alias_value":"NGB76MZMLZNS","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_16","alias_value":"NGB76MZMLZNSNTBT","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_8","alias_value":"NGB76MZM","created_at":"2026-05-18T12:31:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:NGB76MZMLZNSNTBT3TTAHITTH7","target":"record","payload":{"canonical_record":{"source":{"id":"1712.08198","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DB","submitted_at":"2017-12-21T20:22:47Z","cross_cats_sorted":[],"title_canon_sha256":"8f0e9ed6f67093c280cc55c7ad52d0b2651c1704c97c97e7633fec32615af7fa","abstract_canon_sha256":"7c0e9b2d762eae0fdbcf9d9721b8e1dcda7c9c4bc71a85e21995226f3ed71a4f"},"schema_version":"1.0"},"canonical_sha256":"6983ff332c5e5b26cc33dce603a2733fd94e793a55d589616e758269c87cddca","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:15:09.907788Z","signature_b64":"jy2LmXXEczd83iKVF7pvBshmRkiLdscbTdvepzlESVPIX4lZYDt0vYeMcXunqGjEf89Za0hdaJO569B/ZQouDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6983ff332c5e5b26cc33dce603a2733fd94e793a55d589616e758269c87cddca","last_reissued_at":"2026-05-18T00:15:09.907089Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:15:09.907089Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1712.08198","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:15:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pFu1K1o9kQ0Vy1tH3CNCkkSAxnrSTZmTsp0hAaSLQHImJHyjTpmNwjtZ/RLTpZpGlF8CEhljjOKERvdY3tkRCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T11:43:04.115060Z"},"content_sha256":"17033331f974a7e0a70ab08978eabf8f8cf55652adefc943dc70a975c9ccde13","schema_version":"1.0","event_id":"sha256:17033331f974a7e0a70ab08978eabf8f8cf55652adefc943dc70a975c9ccde13"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:NGB76MZMLZNSNTBT3TTAHITTH7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Recursive Programs for Document Spanners","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.DB","authors_text":"Balder ten Cate, Benny Kimelfeld, Liat Peterfreund, Ronald Fagin","submitted_at":"2017-12-21T20:22:47Z","abstract_excerpt":"A document spanner models a program for Information Extraction (IE) as a function that takes as input a text document (string over a finite alphabet) and produces a relation of spans (intervals in the document) over a predefined schema. A well studied language for expressing spanners is that of the regular spanners: relational algebra over regex formulas, which are obtained by adding capture variables to regular expressions. Equivalently, the regular spanners are the ones expressible in non-recursive Datalog over regex formulas (extracting relations that play the role of EDBs from the input do"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1712.08198","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:15:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oLkJUzfI8mTsmlzl04Bh0gYXA+RWiOsFlFQeaqrBXrq70ZWFeXm0LocmRzcokPpjTbn7yOhCrhDFIyZkAoRrCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T11:43:04.115463Z"},"content_sha256":"5c4fc3797200685768e0d6c5d5f45026c8f7ecd92c69209ce1ae6b442658ad1d","schema_version":"1.0","event_id":"sha256:5c4fc3797200685768e0d6c5d5f45026c8f7ecd92c69209ce1ae6b442658ad1d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NGB76MZMLZNSNTBT3TTAHITTH7/bundle.json","state_url":"https://pith.science/pith/NGB76MZMLZNSNTBT3TTAHITTH7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NGB76MZMLZNSNTBT3TTAHITTH7/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-05T11:43:04Z","links":{"resolver":"https://pith.science/pith/NGB76MZMLZNSNTBT3TTAHITTH7","bundle":"https://pith.science/pith/NGB76MZMLZNSNTBT3TTAHITTH7/bundle.json","state":"https://pith.science/pith/NGB76MZMLZNSNTBT3TTAHITTH7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NGB76MZMLZNSNTBT3TTAHITTH7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:NGB76MZMLZNSNTBT3TTAHITTH7","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"7c0e9b2d762eae0fdbcf9d9721b8e1dcda7c9c4bc71a85e21995226f3ed71a4f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DB","submitted_at":"2017-12-21T20:22:47Z","title_canon_sha256":"8f0e9ed6f67093c280cc55c7ad52d0b2651c1704c97c97e7633fec32615af7fa"},"schema_version":"1.0","source":{"id":"1712.08198","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1712.08198","created_at":"2026-05-18T00:15:09Z"},{"alias_kind":"arxiv_version","alias_value":"1712.08198v3","created_at":"2026-05-18T00:15:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1712.08198","created_at":"2026-05-18T00:15:09Z"},{"alias_kind":"pith_short_12","alias_value":"NGB76MZMLZNS","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_16","alias_value":"NGB76MZMLZNSNTBT","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_8","alias_value":"NGB76MZM","created_at":"2026-05-18T12:31:31Z"}],"graph_snapshots":[{"event_id":"sha256:5c4fc3797200685768e0d6c5d5f45026c8f7ecd92c69209ce1ae6b442658ad1d","target":"graph","created_at":"2026-05-18T00:15:09Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"A document spanner models a program for Information Extraction (IE) as a function that takes as input a text document (string over a finite alphabet) and produces a relation of spans (intervals in the document) over a predefined schema. A well studied language for expressing spanners is that of the regular spanners: relational algebra over regex formulas, which are obtained by adding capture variables to regular expressions. Equivalently, the regular spanners are the ones expressible in non-recursive Datalog over regex formulas (extracting relations that play the role of EDBs from the input do","authors_text":"Balder ten Cate, Benny Kimelfeld, Liat Peterfreund, Ronald Fagin","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DB","submitted_at":"2017-12-21T20:22:47Z","title":"Recursive Programs for Document Spanners"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1712.08198","kind":"arxiv","version":3},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:17033331f974a7e0a70ab08978eabf8f8cf55652adefc943dc70a975c9ccde13","target":"record","created_at":"2026-05-18T00:15:09Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"7c0e9b2d762eae0fdbcf9d9721b8e1dcda7c9c4bc71a85e21995226f3ed71a4f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.DB","submitted_at":"2017-12-21T20:22:47Z","title_canon_sha256":"8f0e9ed6f67093c280cc55c7ad52d0b2651c1704c97c97e7633fec32615af7fa"},"schema_version":"1.0","source":{"id":"1712.08198","kind":"arxiv","version":3}},"canonical_sha256":"6983ff332c5e5b26cc33dce603a2733fd94e793a55d589616e758269c87cddca","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6983ff332c5e5b26cc33dce603a2733fd94e793a55d589616e758269c87cddca","first_computed_at":"2026-05-18T00:15:09.907089Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:15:09.907089Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jy2LmXXEczd83iKVF7pvBshmRkiLdscbTdvepzlESVPIX4lZYDt0vYeMcXunqGjEf89Za0hdaJO569B/ZQouDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:15:09.907788Z","signed_message":"canonical_sha256_bytes"},"source_id":"1712.08198","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:17033331f974a7e0a70ab08978eabf8f8cf55652adefc943dc70a975c9ccde13","sha256:5c4fc3797200685768e0d6c5d5f45026c8f7ecd92c69209ce1ae6b442658ad1d"],"state_sha256":"853bfa7311bdca6408e3ed0a7b3655ce845c9a114842ffb7cf1b9a3db88accdd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7qSRYivVRv8el90Mw+QErSpqwiKek2We2+Nzym/CyAjg5Q+XJve+zTwtYrOon7jydXz2EAqU3q2KaCfcI0VxAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T11:43:04.117545Z","bundle_sha256":"2f5306ffb453268c93907b85bee61521fab82331e24e1303c72c65496ac7063c"}}