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Laletterguages are needed to help you specialize the latest set of connectives from the
- Replacing NEWCONNECTIVE with zero or more new connective symbols. Dialects cannot keep the extension point.
- Shedding zero or higher of your predefined connective signs mentioned above. Languages try not to redefine the newest semantics of the predefined connectives, yet not.
- Replacing NEWQUANTIFIER with zero or more new quantifier symbols. Dialects cannot keep the extension point.
- Losing no or more of predetermined quantifier symbols in the list above. Yet not, dialects never redefine the fresh semantics of your own predefined quantifiers.
In the actual presentation syntax, we will be linearizing the predefined quantifier symbols and write them as Exists ?X1. Xn and Forall ?X1. Xn instead of Exists?X1. Xn and Forall?X1. Xn.
Every quantifier symbol has an associated list of variables that are bound by that quantifier. For the standard quantifiers Exists?X1. Xn and Forall?X1. Xn, the associated list of variables is ?X1. Xn.
RIF-FLD reserves the following symbols for standard aggregate functions: Minute, Max, Amount, Avg, Share, Prod, Place, and Bag. Aggregate functions also have an extension point, NEWAGGRFUNC, which must be actualized. Dialects can specialize the aforesaid set of aggregate functions by
- Replacing NEWAGGRFUNC with zero or more new symbols for aggregate functions. Dialects cannot keep the extension point.
- Shedding no or more of your own predefined aggregate services in the above list. Although not, dialects dont change the fresh new semantics of your own predetermined aggregate services.
As with almost every other expansion items, this isn’t a genuine icon on alphabet, but an effective placeholder you to dialects should replace zero or even more genuine the alphabet symbols.
The symbol Naf represents default negation, which is used in rule languages with logic programming and deductive database semantics. Examples of default negation include Clark’s negation-as-failure [Clark87], the well-founded negation [GRS91], and stable-model negation [GL88]. The name of the symbol Naf used here comes from negation-as-failure but in RIF-FLD this can refer to any kind of default negation.
The symbol Neg represents symmetric negation (as opposed to default negation, which is asymmetric because completely different inference rules are used to derive p and Naf p). Examples of symmetric negation include classical first-order negation, explicit negation, and strong negation [APP96].
=, #, and ## are used in formulas that define equality, class membership, and subclass relationships, respectively. The symbol -> is used in terms that have named arguments and in frame terms. The symbol Outside indicates that an atomic formula or a function term is defined externally (e.g., a built-in), Dialect is a directive used to indicate the dialect of a RIF document (for those dialects that require this), the symbols Base and Prefix enable abridged representations of IRIs, and the symbol Import is an import directive. The Module directive is used to connect remote terms with the actual remote RIF documents.
The fresh signs
Finally, the symbol File is used for specifying RIF-FLD documents and the symbol Category is used to organize RIF-FLD formulas into collections. ?
2.3 Symbol Places
Such or any other abbreviations will be utilized as prefixes from the compact URI-for example notation [CURIE], a good notation having succinct symbolization out-of Iris [RFC-3987]. The precise concept of so it notation within the RIF is set from inside the [RIF-DTB].
The set of all constant symbols in a RIF dialect is partitioned into a number of subsets, called symbol spaces, which are used to represent XML Schema datatypes, datatypes defined in other W3C specifications, such as rdf:XMLLiteral, and to distinguish other sets of constants. All constant symbols have a syntax (and sometimes also semantics) imposed by the symbol space to which they belong.
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- xs: stands for the XML Schema URI
- rdf: stands for
- pred: stands for
- rif: stands for the URI of RIF,
