/**
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { NamedNode } from 'n3';
import type { Quad, Term, Quad_Object, Quad_Predicate, Quad_Subject } from 'n3';
export interface Topic {
    subject: Quad_Subject;
    quads: Quad[];
}
export interface TypedTopic extends Topic {
    types: readonly NamedNode[];
}
/**
 * If an ObjectPredicate represents a comment, returns the comment. Otherwise
 * returns null.
 */
export declare function GetComment(q: Quad): {
    comment: string;
} | null;
/**
 * If an ObjectPredicate represents a subClass relation, returns the parent
 * class. Otherwise returns null.
 */
export declare function GetSubClassOf(q: Quad): {
    subClassOf: NamedNode;
} | null;
/** Return true iff this object is a subclass of some other entity. */
export declare function IsSubclass(topic: TypedTopic): boolean;
/** Returns true iff a node corresponds to http://schema.org/DataType */
export declare function IsDataType(t: Quad_Subject): boolean;
/** Returns true iff a Topic represents a DataType. */
export declare function ClassIsDataType(topic: TypedTopic): boolean;
/**
 * Returns true iff a Topic represents a named class.
 *
 * Note that some schemas define subclasses without explicitly redefining them
 * as classes. So just because a topic isn't directly named as a class doesn't
 * mean that it isn't a named class.
 *
 * A named class is such if it *OR ANY OF ITS PARENTS* are directly named
 * classes.
 */
export declare function IsDirectlyNamedClass(topic: TypedTopic): boolean;
/**
 * Returns true iff a Predicate corresponds to http://schema.org/domainIncludes
 */
export declare function IsDomainIncludes(value: Quad_Predicate): boolean;
/**
 * Returns true iff a Predicate corresponds to http://schema.org/rangeIncludes
 */
export declare function IsRangeIncludes(value: Quad_Predicate): boolean;
/**
 * Returns true iff a Predicate corresponds to http://schema.org/supersededBy.
 */
export declare function IsSupersededBy(value: Quad_Predicate): boolean;
/**
 * Returns true iff a Predicate corresponds to
 * http://www.w3.org/1999/02/22-rdf-syntax-ns#type.
 */
export declare function IsType(predicate: Quad_Predicate): boolean;
/** Returns iff an Object can be described as a Type Name. */
export declare function IsTypeName(value: Quad_Object): value is NamedNode;
/**
 * If an ObjectPredicate corresponds to a
 * http://www.w3.org/1999/02/22-rdf-syntax-ns#type, returns a Type it describes.
 */
export declare function GetType(value: Quad): NamedNode | null;
/**
 * Returns all Nodes described by a Topic's
 * http://www.w3.org/1999/02/22-rdf-syntax-ns#type predicates.
 */
export declare function GetTypes(values: readonly Quad[]): readonly NamedNode[];
/**
 * Returns true iff a Type corresponds to
 * http://www.w3.org/2000/01/rdf-schema#Class
 */
export declare function IsClassType(type: Term): boolean;
/**
 * Returns true iff a Type corresponds to
 * http://www.w3.org/1999/02/22-rdf-syntax-ns#Property
 */
export declare function IsPropertyType(type: Term): boolean;
/**
 * Returns true iff a Subject has a Type indicating it is an Enum value.
 *
 * Enum Values have, in addition to other Data or Class types, another object as
 * its "Type".
 */
export declare function HasEnumType(types: readonly NamedNode[]): boolean;
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