# Laletterguages are required to help you specialise brand new band of connectives from the

- Replacing
`NEWCONNECTIVE`with zero or more new connective symbols. Dialects cannot keep the extension point. - Losing no or more of one’s predetermined connective icons mentioned above. Languages never redefine the semantics of one’s predefined connectives, however.

- Replacing
`NEWQUANTIFIER`with zero or more new quantifier symbols. Dialects cannot keep the extension point. - Shedding zero or maybe more of your predefined quantifier icons listed above. not, languages do not change the new semantics of the predefined quantifiers.

In the actual presentation syntax, we will be linearizing the predefined quantifier symbols and write them as `Exists ?X _{step step step one}. X_{n}` and

`Forall ?X`instead of

_{1}. X_{n}`Exists`and

_{?X1. Xn}`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`, the associated list of variables is

_{?X1. Xn}`?X`.

_{1}. X_{n}RIF-FLD reserves the following symbols for standard aggregate functions: `Minute`, `Max`, `Amount`, `Avg`, `Contribution`, `Prod`, `Place`, and `Wallet`. 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 even more of your own predetermined aggregate properties in the list above. But not, dialects cannot redefine the brand new semantics of the predetermined aggregate characteristics.

As with almost every other extension issues, this is not an actual symbol in the alphabet, but a great placeholder you to languages are meant to replace zero or more actual the latest alphabet signs.

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 `Additional` 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 newest icons

Finally, the symbol `File` is used for specifying RIF-FLD documents and the symbol `Group` is used to organize RIF-FLD formulas into collections. ?

## dos.step 3 Symbol Places

This type of or any other abbreviations might possibly be used since prefixes from the lightweight URI-like notation [CURIE], good notation getting concise expression of Eye [RFC-3987]. The particular meaning of it datingranking.net/blackpeoplemeet-review notation into the RIF is scheduled when you look at 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.

`xs:`stands for the XML Schema URI`rdf:`stands for`pred:`stands for`rif:`stands for the URI of RIF,

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