The Role of Semantics in Legal Expert Systems and Legal Reasoning*

R.K. Stamper · Ratio Juris · 1991 · artificial-intelligence-and-law · 10.1111/j.1467-9337.1991.tb00094.x · record stamper1991-the-role-of-semantics-in-legal-exp
tag layer · index · concepts · authors · עברית
Where this record's text came from. faceted 2026-08 by reading the locally held text (pdftext); every evidence string verified as an exact substring of that text before merging. Position/theory paper with a worked formalism and an appendix example (Canadian Unemployment Insurance law), so 'system-or-tool-building' was chosen over 'review'; the shape of the contribution is nonetheless primarily a critique of classical-logic legal expert systems, with the Legol/Norma proposal offered as the constructive remedy. The PDF extraction is noisy in places (garbled words such as 'classlfy', 'clanfy', broken footnote markers and page-header intrusions), so quotes were restricted to sentences that survived extraction cleanly. Relations to Sergot et al. (1986) and Mackaay et al. (1990) exist in the text but read as illustrative use rather than an explicitly stated builds-on/contradicts relation, so they were left out. 2026-08-14, 2026-08-15 and 2026-08-26 schema-0.3 passes: every quote verified as an exact substring of the staged text and anchored at merge time; concept terms verified present; every edge endpoint an existing node.
How to read this page. The article itself is not reproduced here — this paper is not cleared for redistribution, so what follows is the tag layer alone. The evidence sentences are withheld with the article. The table at the foot lists every tag the record carries; each row names the facet it belongs to, and the whose words column says whether the tag records the paper's own wording or the tagger's sentence about the paper. Every tag links to each other paper in the corpus carrying it. The machine-readable edition of the same thing is the TEI file beside this one, where the tags live in standOff, and the article is at its publisher via the link below. When we have changed our mind. Some entries in the table begin with a word in capitals and the reason for it. EVIDENCE CORRECTED — the finding still stands, but we had quoted the wrong sentence from the paper, and the quotation has been replaced with the right one. RETRACTED — the entry itself was wrong; it stays on the page, marked, with the reason, rather than being deleted. WITHDRAWN AND REPLACED — the entry was wrong, and a corrected version of it appears in the entries below. Each mark carries its own reason, in brackets, because the reasons differ from one entry to the next. An entry we have WITHDRAWN is removed from this page and kept in the record, with its reason. A line reading Audit and a date is a later re-reading of the entry against its whole sentence: DOUBTFUL means it was kept, and the reason says what is loose about it. Quotation marks inside the tagger's sentence. Where a tag is the tagger's own sentence, a phrase in quotation marks inside it is borrowed from the paper — the tagger's wording around it is not. The paper's own sentence is the evidence quote for that row; on this page it is withheld with the article, and the article is at its publisher. Nothing inside quotation marks anywhere on this page is ours: if it is quoted, it is the paper's. Whose words a concept carries. A concept entry records a term the paper itself uses, so the term, the sense given for it, and its evidence are the paper's own words, quoted where the paper fixes them. This is the opposite of a sense entry in the tag table, which is the tagger's sentence about how the paper uses a term. Where a concept entry could not be grounded in the paper's words, the entry says so on its own row.

Tags on this paper

Every tag the record carries, each linking to every other paper in the corpus that carries it. A tag appears here whether or not its words occur in the article — the spans below are only the ones a sentence in this paper licenses. Of the 5 concept tags on this paper, all 5 are grounded in a quoted sentence.
bureaucratic expert systems citizenship predicate logic fat predicates semantics The freedom to invent 'fat predicates' lets each analyst build a private language, which in turn produces complexity, rigidity, the illusion of natural-language understanding and the difficulty of merging systems Forcing analysis down to individual words and placing them in an ontological structure removes the arbitrariness, because the structure itself generates the questions the analyst must answer the conduit metaphor of language realisation norm ontology chart Norma MEASUR semantic unit epistemological principles ontological dependent ontological antecedent system-or-tool-building

Legend

relation to other workclaim_relationshow this paper stands to another: agrees, contradicts, extends, qualifies
claim typeclaim_typethe shape of the claim: existence, mechanism, method, critique, prediction, null
conceptconceptsan idea the paper works with, quoted where the paper uses it
content tagcontent_tagsa finding, definition, quantity, statistic or variable named in the paper
limitationlimitationswhat the paper says its evidence cannot support
mechanismmechanismshow the reported effect is said to come about
methodmethodhow the paper produced its evidence
phenomenonphenomenonthe effect or regularity under study
sensesensesa distinct use of a term, quoted where the paper fixes it
transfertransfersa method or concept carried in from another field

The paper

The full text is not reproduced here. This article is not cleared for redistribution, so the page carries the tag layer only. Its evidence sentences are withheld; the grounding status remains with each tag, and the article itself is at https://doi.org/10.1111/j.1467-9337.1991.tb00094.x. The reading view exists for the papers whose licence permits it.

Every tag on this page

claim_relations 2 · claim_type 1 · concepts 5 · content_tags 23 · limitations 7 · mechanisms 2 · method 1 · phenomenon 1 · senses 3 · transfers 1

This record holds no relations between concepts or controls. A layer is empty when the tagger recorded nothing in it — which is not the same as the paper having nothing to record.

facettagfieldconf.whose words
claim_typecritique
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claim_typethe paper's words
phenomenonsemantics of legal expert systems
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phenomenonthe paper's words
methodsystem-or-tool-building
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methodthe paper's words
mechanismsmechanisms
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mechanisms[0]the tagger's words
mechanismsmechanisms
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mechanisms[1]the tagger's words
limitationsThe proposed alternative formalism is admittedly unfinished.
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what this limits: the proposed alternative formalism: THE WORK IS NOT YET COMPLETE
limitations[0]the tagger's words
limitationsThe intermediate Legol solution is acknowledged to be defective and not to function as a logic.
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what this limits: the intermediate Legol solution specifically: THIS INTERMEDIATE SOLUTION IS FULL OF DEFECTS
limitations[1]the tagger's words
limitationsThe intermediate solution still rests on the assumptions of the framework the paper criticises.
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what this limits: the claim that the paper's own proposal escapes the problem it diagnoses: DESPITE THESE ADVANCES, THIS INTERMEDIATE SOLUTION FAILS TO BREAK AWAY FROM THE OLD, DEFECTIVE FRAMEWORK
limitations[2]the tagger's words
limitationsFormal logic does not supply the meanings it appears to encode: knowing what the predicates mean requires already knowing which individuals fall into the classes they name.
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what this limits: a legal rule encoded in predicate logic as a representation of its meaning: the paper states one must already assume knowledge of which individuals have the properties named by the predicates
limitations[3]1.0the tagger's words
limitationsThe reasoning the systems are meant to support is stated to be unmechanisable.
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what this limits: a legal expert system as a substitute for legal reasoning: the paper states much of the required reasoning needs creative thinking, judgment and accountability, and cannot be mechanised
limitations[4]1.0the tagger's words
limitationsThe paper relabels the systems to scope the claim, while explicitly not denying their value.
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what this limits: the label 'expert system' for these tools: the paper proposes 'bureaucratic expert systems' as the accurate description, while stating this does not deny their potential value
limitations[5]1.0the tagger's words
limitationsThe paper's central objection is put as a question about TRANSFER rather than as a demonstration: why expect a logic devised by mathematicians for their own work to move comfortably into law and other practical social affairs, which do not share its special properties. The argument is that the transfer was never licensed, not that a particular system was measured and failed.
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limitations[6]0.9the tagger's words
transfersWeber's ideal-type model of bureaucratic administration is applied to rule-based legal expert systems, which is what licenses the paper's reclassification of them as 'bureaucratic' rather than 'legal' expert systems
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transfers[0]the tagger's words
conceptsbureaucratic expert systems
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concepts[0]the paper's words
conceptscitizenship
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also in: citizenship
concepts[1]the paper's words
conceptspredicate logic
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concepts[2]the paper's words
conceptsfat predicates
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concepts[3]0.95the paper's words
conceptssemantics
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also in: semantics
concepts[4]0.85the paper's words
sensescitizenship - a concept whose MEANINGS MULTIPLY WITH ITS CRITERIA: it exists by virtue of several different criteria, and the paper says this gives rise to several different meanings
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senses[0]1.0the tagger's words
sensespreservation of wording - a professional practice with a stated reason: lawyers keep forms of words that have survived judicial scrutiny, and see danger in casual reformulation
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senses[1]1.0the tagger's words
sensesfat predicates - elongated symbols that resemble natural language and are given meaning by the analyst rather than by the system; the paper calls the habit the Humpty Dumpty syndrome
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senses[2]0.95the tagger's words
claim_relationscontradicts → Susskind (1987), Expert Systems in Law
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claim_relations[0]the tagger's words
claim_relationsbuilds-on → Dworkin's argument from principles
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claim_relations[1]the tagger's words
content_tagsA legal expert system built on propositional logic has essentially no semantics of its own: whoever assigns truth-values to the elementary propositions performs all the interpretation, and the machine merely computes consequences.
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content_tags.findings[0]the tagger's words
content_tagsPropositional logic recognises no unit smaller than a whole proposition, not even individual words.
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content_tags.findings[1]the tagger's words
content_tagsPredicate logic leaves the ontology to the analyst's discretion — the same content can be modelled either as a separate individual or folded into a longer predicate — so what exists in the knowledge base is decided arbitrarily.
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content_tags.findings[2]the tagger's words
content_tagsTwo engineers formalising the same legal concept in predicate logic arrive at an identical expression only by happy accident.
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content_tags.findings[3]the tagger's words
content_tagsBecause each application invents its own private predicate language, separate legal knowledge bases cannot be integrated by simply merging their rules.
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content_tags.findings[4]the tagger's words
content_tagsIn a legal dispute, truth is reached at the end of the process rather than given at its start.
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content_tags.findings[5]the tagger's words
content_tagsExistence here-and-now takes the place of truth as the primitive concept, because existence is easy to operationalise.
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content_tags.findings[6]the tagger's words
content_tagsThe logic always points to the agents in the social system who are responsible for using the constructs the formalism expresses.
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content_tags.findings[7]the tagger's words
content_tagsIn Norma an open system is the only possible representation.
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content_tags.findings[8]the tagger's words
content_tagsThe resulting method of analysis proved effective in designing systems cheaper to build and far cheaper to maintain than conventionally developed ones.
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content_tags.findings[9]the tagger's words
content_tagsbureaucratic expert systems
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content_tags.definitions[0]the tagger's words
content_tagsthe conduit metaphor of language
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content_tags.definitions[1]the tagger's words
content_tagsfat predicates
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content_tags.definitions[3]the tagger's words
content_tagsrealisation
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also in: realisation
content_tags.definitions[4]the tagger's words
content_tagsnorm
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also in: norm
content_tags.definitions[6]the tagger's words
content_tagsontology chart
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content_tags.definitions[7]the tagger's words
content_tagsNorma
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also in: Norma
content_tags.definitions[8]the tagger's words
content_tagsMEASUR
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also in: MEASUR
content_tags.definitions[9]the tagger's words
content_tagssemantic unit
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also in: semantic unit
content_tags.definitions[10]the tagger's words
content_tagsepistemological principles
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content_tags.definitions[11]the tagger's words
content_tagsontological dependent
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content_tags.definitions[13]the tagger's words
content_tagsontological antecedent
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content_tags.definitions[14]the tagger's words
content_tagssix pages ... 270 pages — space Twining and Myers devote to deductive reasoning in their 270-page book on legal rules, cited as evidence that deduction is only a small part of legal argumentation
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content_tags.quantities[0]the tagger's words

Interpretive choices

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