Semantic rule

Two-Dimensional Representation of Chemical Structures. The lUPAC standardization of organic nomenclature allows automatic translation of a chemical s name into its chemical stmcture, or, conversely, the naming of a compound based on its stmcture. The chemical formula for a compound can be translated into its stmcture once a set of semantic rules for representation are estabUshed (26). The semantic rules and their appHcation have been described (27,28). The inverse problem, generating correct names from chemical stmctures, has been addressed (28) and explored for the specific case of naming condensed benzenoid hydrocarbons (29,30). 

To close full circle, as perhaps you may have guessed by now, dialects and semantic rules themselves are defined within packages, although, as we ve said, consider them virtual until further notice. But here is a short example to show the idea. 

Semantic rules are expressed as templates a dialect contains nested packages for its semantic rules. Each rule translates a slightly higher-level notation into its equivalent lower-level one. Here, any line between two type boxes that contains an explicit stereotype means the same as inverse attributes (see Figure 9.41). So what should an association line mean if it has no stereotype tag To define a default, you identify the untagged feature with the appropriate tag9 (see Figure 9.42). 

Some informal and ad hoc notations are always useful as long as you recognize that they are informal they should sometimes be cast into a more precise form as their purpose becomes clear. Useful new formal notations also will no doubt be invented their semantics should be described clearly using frameworks, as illustrated in Section 9.8.3, Examples of Semantic Rules for a Dialect. 

Many elements of a controlled vocabulary are effectively defined by software implementation. Thus, the description of the HTML language requires certain elements to have specified behavior. For example, supports the display of raster images, but the precise look may vary between implementations and file types. Implementation through software is useful and powerful where authors, publishers, readers, and processors all use the same system. Because STM publishing is increasingly multidisciplinary, this implementation becomes problematic. Often a reader may have to download specialist software that is idiosyncratic and that may not have enough functionality, especially the export of semantically rich data. Moreover, the semantic rules are often buried deep in the software and difficult to understand precisely. 

A semantic rule, which assigns to each linguistic term its meaning—an appropriate fuzzy number defined on the range of the base variable... 

Olesen, H. 1996. Properties and units in the clinical laboratory science 1. Syntax and semantic rules, lUPAC-IFCC recommendations 1995. Clinica ChimicaActa 245 S5-22. 

Of more interest are the structuring and semantic rules. Thus ==enclosing a title== allows a section heading to be defined, and this in turn is used to construct a table of contents for the document. More elaborate structure in the form of a table is imparted using ... 

I. Lukovits,/. Chem.Inf. Comput. Sci.,40,361 (2000). Isomer Generation Semantic Rules for... 

For AG driven ASAP scheduling, a synthesized attribute called control step is used and the semantic rule corresponding to (1) is ... 

AG driven ALAP scheduling, an inherited attribute called i ain controLstep is used, evaluated by the following semantic rule attached to (1) ... 

Traditional fuzzy linguistic approach The first possibility defines the linguistic term set by means of a context-free grammar, and the semantics of linguistic terms is represented by fuzzy numbers described by membership fimctions based on parameters and a semantic rule [24,59],... 

Semantic elaboration That part of a compiler s front end that checks semantic rules and produces an intermediate representation for the program. Often, semantic elaboration is coupled directly to the parser, where individual actions can be triggered as specific grammatical constructs are recognized. 

When performing quantitative analysis of a graph based process language we choose structural semantic rules such that they impose the minimum semantic interpretation necessary to determine the control flow of a model. In the case of a BPMN BPD, it adds no more semantic interpretation than implied by the standard (Object Management Group 2011a). In the case of BPMN, when we have imposed restrictions they have been made only for simplicity and are discussed at length in previous work (Herbert Sharp 2012). 

Transfimnations can be described by semantic rules and can thus (as can jffogramming languages) be used for a whole class of problems and situations and are not restricted to a particular type of ivogram. 

Since our current problem is restricted to neutral [H,C,N,0,F], the semantic rules are very straightforward ... 

Applying these semantic rules to the substituent graphs shown in Figure 1 results in the sets of substituents shown as hydrogen-suppressed patterns in Table 1. In this table, patterns are restricted to comma-delimited lists of atoms inside brackets. 

Modality as necessity can usefully be captured in the intuition that the statement in question cannot intelligibly be negated. This intuition can reflect two very different kinds of beliefs or presumptions as to what the function of the law statement could be. R may be that those who hold to the law believe that there is a stable natural mechanism that accounts for the regularity covered by it, as a matter of empirical fact. However, some universal statements are taken to be necessary because their function is not to describe the ways things must be with a pre-given vocabulary, but rather to express a rule which fixes some aspect of the meaning of the descriptive terms that appear in the law . It may be that the law only seems to be about material stuff in the material world. It expresses a semantic rule rather than a putative matter of fact. Newton s Second Law, that the force acting on a body is the product of mass and acceleration, has sometimes been treated as a definition of force as that which produces acceleration. Frederick Waismann once declared that all statements ever uttered by chemists, except the most recent, were necessary truths, since they served to amplify the criteria of identity for the substances in question. 

---