Examples of using Blank node in English and their translations into Hungarian
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Colloquial
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Official
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Medicine
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Ecclesiastic
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Financial
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Programming
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Official/political
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Computer
The subject, which is an RDF URI reference or a blank node.
A blank node is a node that is not a URI reference or a literal.
The object, which is an RDF URI reference, a literal or a blank node.
Notice also that the blank nodes themselves are perfectly well-defined entities;
The members of a container may be resources(including blank nodes) or literals.
A blank node is a node in a graph that is neither a URI reference nor a literal.
This is not the same as assuming that the blank node indicates an'unknown' uriref;
The same information might bemore accurately given by the publisher using a blank node, as.
When Jane herself doesn't have a URI, a blank node gives us a more accurate way of modeling this situation.
Using blank nodes in this way can also help avoid the use of literals in what might be inappropriate situations.
When Jane herself does not have a URI, a blank node provides a more accurate way of modeling this situation.
For example, in some cases it might be appropriate to use a containerresource having a URIref rather than using a blank node.
This notation uses a nodeID convention to indicate blank nodes in the triples of a graph.
In this case, the blank node represents a person, the editor of the document, and the person is described by his name and home page.
The approach illustrated here, which is the most direct approach,is to assign a blank node identifier to each blank node.
Using a blank node to represent this"someone" is just a more accurate way to represent the real world situation.
Its nesting within the property element is an abbreviated way of indicating that the blank node is the value of this property.
In this example we might use the blank node identifier_:johnaddress to refer to the blank node, in which case the resulting triples might be.
In this graph, each member of the collection, such as s: Amy, is the object of an rdf:first property whose subject is a resource(a blank node in this example) that represents a list.
With this definition, M shows how eachblank node in G can be replaced with a new blank node to give G'.
Blank nodes also give us a way to more accurately make statements about resources that may not have URIs, but that are described in terms of relationships with other resources that do have URIs.
Note that while node identifiers such as_: xxx serve to identify blank nodes in the surface syntax, these expressions are not considered to be the label of the graph node they identify;
We have simply extended the rules for defining denotations under an interpretation, so that the same interpretation that provides a truth-value for groundgraphs also assigns truth-values to graphs with blank nodes, even though it provides no denotation for the blank nodes themselves.
In the RDF abstract syntax, a blank node is just a unique node that can be used in one or more RDF statements, but has no intrinsic name.
This is appropriate when the graphs come from different sources andthere is no justification for assuming that a blank node in one refers to the same entity as any blank node in the other.
Thus, it would be meaningful to claim that the blank node in the second graph above does not refer to the triple in the first graph, but to some other triple with the same structure.
This effectively treats all blank nodes as having the same meaning as existentially quantified variables in the RDF graph in which they occur, and which have the scope of the entire graph.
Merging two graphs treats the blank nodes in eachgraph as being existentially quantified in that graph, so that no blank node from one graph is allowed to stray into the scope of the other graph's surrounding quantifier.
The advantage of using a blank node identifier over some of the other approaches described in[RDF-SYNTAX]is that using a blank node identifier allows the same blank node to be referred to in more than one place in the same RDF/XML document.