75 lines
3.0 KiB
Java
75 lines
3.0 KiB
Java
/**
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* Literal
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* Copyright 2011 by Michael Peter Christen, mc@yacy.net, Frankfurt am Main, Germany
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* First released 18.12.2011 at http://yacy.net
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*
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* $LastChangedDate: 2011-04-14 00:04:23 +0200 (Do, 14 Apr 2011) $
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* $LastChangedRevision: 7653 $
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* $LastChangedBy: orbiter $
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.cora.lod;
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import java.util.regex.Pattern;
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import net.yacy.cora.document.id.MultiProtocolURL;
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/**
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* A literal is the possible value for a predicate.
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* A set of literals is the norm of a predicate.
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* Each literal can have an attached explanation which we express
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* as a link to the resource that explains the literal.
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*/
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public interface Literal {
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/**
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* the terminal is the actual content of the property and also
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* the visual representation of the content of a property if the
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* literal is assigned to that property.
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* @return a string representing the literal
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*/
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public String getTerminal();
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/**
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* the subject of a literal is a reference to a resource that
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* explains the literal. If an object has attached properties
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* from different vocabularies and properties assigned to the
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* object have actual literal instances assigned, then the set
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* of subjects of these literals explain the object as a co-notation
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* to knowledge. Subjects of literals shall therefore be
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* knowledge authorities for the predicates where the literal is
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* assigned.
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* @return an url to a knowledge authority for the literal
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*/
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public MultiProtocolURL getSubject();
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/**
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* if a resource is poorly annotated with metadata an it shall
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* be automatically annotated, then the terminal of a literal
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* may be too weak to discover literals in the resource. An additional
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* discovery pattern may help to reduce the set of literals that can
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* be discovered automatically. A discovery pattern is then not
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* a replacement of the terminal itself, it is an additional pattern
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* that must occur also in the resource where also the terminal of
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* the literal appears. If the terminal itself is sufficient to discover
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* the literal, then the discovery pattern may be a catch-all '.*' pattern.
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* @return the discovery pattern to identify the literal in the resource.
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*/
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public Pattern getDiscoveryPattern();
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}
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