{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:XP5CD7JEPTCLPWQPRBNXSXBD6D","short_pith_number":"pith:XP5CD7JE","canonical_record":{"source":{"id":"1905.12069","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2019-05-28T20:21:19Z","cross_cats_sorted":[],"title_canon_sha256":"e90507914eb3b433e0ac2f44a8b33dcbd16bad4c42acbbaa2d8ff360c368a610","abstract_canon_sha256":"c414d4e06f134a92632b3b5e907a448be2b9f3c026a8ab86ad671cb4bc17efd3"},"schema_version":"1.0"},"canonical_sha256":"bbfa21fd247cc4b7da0f885b795c23f0d4486ba4afcf018d06dc04efe9e2b3d7","source":{"kind":"arxiv","id":"1905.12069","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.12069","created_at":"2026-05-17T23:44:49Z"},{"alias_kind":"arxiv_version","alias_value":"1905.12069v1","created_at":"2026-05-17T23:44:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.12069","created_at":"2026-05-17T23:44:49Z"},{"alias_kind":"pith_short_12","alias_value":"XP5CD7JEPTCL","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"XP5CD7JEPTCLPWQP","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"XP5CD7JE","created_at":"2026-05-18T12:33:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:XP5CD7JEPTCLPWQPRBNXSXBD6D","target":"record","payload":{"canonical_record":{"source":{"id":"1905.12069","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2019-05-28T20:21:19Z","cross_cats_sorted":[],"title_canon_sha256":"e90507914eb3b433e0ac2f44a8b33dcbd16bad4c42acbbaa2d8ff360c368a610","abstract_canon_sha256":"c414d4e06f134a92632b3b5e907a448be2b9f3c026a8ab86ad671cb4bc17efd3"},"schema_version":"1.0"},"canonical_sha256":"bbfa21fd247cc4b7da0f885b795c23f0d4486ba4afcf018d06dc04efe9e2b3d7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:44:49.041279Z","signature_b64":"K/kChtWP348Zc65TmeeqWRcooZ3ovB0vCZDCsdPB8qXVS6N9rXRwCaDLVNoZjjatwMHxL+dsng30xlfdnvfmBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bbfa21fd247cc4b7da0f885b795c23f0d4486ba4afcf018d06dc04efe9e2b3d7","last_reissued_at":"2026-05-17T23:44:49.040701Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:44:49.040701Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1905.12069","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:44:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Qrx0CC6NH5dZ1KpmQLFFCTWzHonxHZp8eYP8DIq+8CEZh5drn206F57zgn9exWFlagZy9mI8iI7OLlGDBMamDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T11:42:11.213069Z"},"content_sha256":"296a2d03446928af0f3c306c81862f406b74ab79f0f37fd7205900852f7c47da","schema_version":"1.0","event_id":"sha256:296a2d03446928af0f3c306c81862f406b74ab79f0f37fd7205900852f7c47da"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:XP5CD7JEPTCLPWQPRBNXSXBD6D","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"SEMA: an Extended Semantic Evaluation Metric for AMR","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CL","authors_text":"Marco A. S. Cabezudo, Rafael T. Anchieta, Thiago A. S. Pardo","submitted_at":"2019-05-28T20:21:19Z","abstract_excerpt":"Abstract Meaning Representation (AMR) is a recently designed semantic representation language intended to capture the meaning of a sentence, which may be represented as a single-rooted directed acyclic graph with labeled nodes and edges. The automatic evaluation of this structure plays an important role in the development of better systems, as well as for semantic annotation. Despite there is one available metric, smatch, it has some drawbacks. For instance, smatch creates a self-relation on the root of the graph, has weights for different error types, and does not take into account the depend"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.12069","kind":"arxiv","version":1},"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":"2026-05-17T23:44:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MZgZZDqbobNACgXaECbMIsl448StlDeqJl5US7xoRqHpmTMFE+cCq2ImaFrKXnLToMZxW/4ro6qurL5fG5RPCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T11:42:11.213564Z"},"content_sha256":"6eae3c910358fac847e10ad1614d06fc7d7fcd8414391a8d67acd5a33ef94388","schema_version":"1.0","event_id":"sha256:6eae3c910358fac847e10ad1614d06fc7d7fcd8414391a8d67acd5a33ef94388"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XP5CD7JEPTCLPWQPRBNXSXBD6D/bundle.json","state_url":"https://pith.science/pith/XP5CD7JEPTCLPWQPRBNXSXBD6D/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XP5CD7JEPTCLPWQPRBNXSXBD6D/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":"2026-08-06T11:42:11Z","links":{"resolver":"https://pith.science/pith/XP5CD7JEPTCLPWQPRBNXSXBD6D","bundle":"https://pith.science/pith/XP5CD7JEPTCLPWQPRBNXSXBD6D/bundle.json","state":"https://pith.science/pith/XP5CD7JEPTCLPWQPRBNXSXBD6D/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XP5CD7JEPTCLPWQPRBNXSXBD6D/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:XP5CD7JEPTCLPWQPRBNXSXBD6D","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":"c414d4e06f134a92632b3b5e907a448be2b9f3c026a8ab86ad671cb4bc17efd3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2019-05-28T20:21:19Z","title_canon_sha256":"e90507914eb3b433e0ac2f44a8b33dcbd16bad4c42acbbaa2d8ff360c368a610"},"schema_version":"1.0","source":{"id":"1905.12069","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.12069","created_at":"2026-05-17T23:44:49Z"},{"alias_kind":"arxiv_version","alias_value":"1905.12069v1","created_at":"2026-05-17T23:44:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.12069","created_at":"2026-05-17T23:44:49Z"},{"alias_kind":"pith_short_12","alias_value":"XP5CD7JEPTCL","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"XP5CD7JEPTCLPWQP","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"XP5CD7JE","created_at":"2026-05-18T12:33:33Z"}],"graph_snapshots":[{"event_id":"sha256:6eae3c910358fac847e10ad1614d06fc7d7fcd8414391a8d67acd5a33ef94388","target":"graph","created_at":"2026-05-17T23:44:49Z","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":"Abstract Meaning Representation (AMR) is a recently designed semantic representation language intended to capture the meaning of a sentence, which may be represented as a single-rooted directed acyclic graph with labeled nodes and edges. The automatic evaluation of this structure plays an important role in the development of better systems, as well as for semantic annotation. Despite there is one available metric, smatch, it has some drawbacks. For instance, smatch creates a self-relation on the root of the graph, has weights for different error types, and does not take into account the depend","authors_text":"Marco A. S. Cabezudo, Rafael T. Anchieta, Thiago A. S. Pardo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2019-05-28T20:21:19Z","title":"SEMA: an Extended Semantic Evaluation Metric for AMR"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.12069","kind":"arxiv","version":1},"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":"sha256:296a2d03446928af0f3c306c81862f406b74ab79f0f37fd7205900852f7c47da","target":"record","created_at":"2026-05-17T23:44:49Z","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":"c414d4e06f134a92632b3b5e907a448be2b9f3c026a8ab86ad671cb4bc17efd3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2019-05-28T20:21:19Z","title_canon_sha256":"e90507914eb3b433e0ac2f44a8b33dcbd16bad4c42acbbaa2d8ff360c368a610"},"schema_version":"1.0","source":{"id":"1905.12069","kind":"arxiv","version":1}},"canonical_sha256":"bbfa21fd247cc4b7da0f885b795c23f0d4486ba4afcf018d06dc04efe9e2b3d7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bbfa21fd247cc4b7da0f885b795c23f0d4486ba4afcf018d06dc04efe9e2b3d7","first_computed_at":"2026-05-17T23:44:49.040701Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:44:49.040701Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K/kChtWP348Zc65TmeeqWRcooZ3ovB0vCZDCsdPB8qXVS6N9rXRwCaDLVNoZjjatwMHxL+dsng30xlfdnvfmBA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:44:49.041279Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.12069","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:296a2d03446928af0f3c306c81862f406b74ab79f0f37fd7205900852f7c47da","sha256:6eae3c910358fac847e10ad1614d06fc7d7fcd8414391a8d67acd5a33ef94388"],"state_sha256":"242ac9ffad10b53eb2bfd5fdabc4ab1f1683e27b551368dbdddb175438739d30"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DyjdVR9+Hc6uuqtA+/3O/kaz9prAl26FLVMxjhy1qRLaYPQcXWdrR4Ur9P0QZ6aO3saHi2a0W/WcVWG0tR1iAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T11:42:11.217734Z","bundle_sha256":"9e54175e952039563970962cf414f70221dd28ee4d685cafe167c71618fe9109"}}