Deletes triples in a Semantic Web endpoint based on the triples from the input table. The triples in the table have to match the triples in the endpoint exactly.

In order to prepend namespaces it is necessary to choose Prepend in the settings dialogue.

If all triple columns are selected (i.e. subject, predicate, object column), the table is read out row-wise, so exactly the given triples are deleted. It is possible to leave out subject, predicate, object cells empty; but at least one cell as to be non-empty. For instance, the following entries for triples are possible:

Subject	Predicate	Object
Peter
Peter	Country
Peter		Germany
Peter	Country	Germany
	Country	Germany
	Country
		Germany

If one or two of the triple columns are selected, only the selected columns will be read-out. For instance, if the input table is like

Subject	Predicate	Object
Peter	Country	Germany

but only subject and object column is selected, the triple will be interpreted as

Subject	Predicate	Object
Peter		Germany

If only "graph name" column is selected, corresponding graph including stored triples, will be deleted. Attention: If all triples in a graph are deleted, the graph can stil exists (depends on connected endpoint). To be sure that a graph is completely deleted, it has to be deleted by selecting only the "Graph name" column.

Please see node description of Semantic Web node "SPARQL Insert" for usage of options "Graph name" and "Global Graph name".

Functionality is provided using the Apache Jena Framework

Options

Subject

Column containing subjects of triples.

Predicate

Column containing predicates of triples.

Object

Column containing objects of triples.

Graph name

Column containing the names of the graphs in which the triple should be deleted. Or if only this is selected the names of the graphs that should be deleted.

Subject Namespace

If a namespace is given, the namespace of subject URIs will be changed.

Predicate Namespace

If a namespace is given, the namespace of predicate URIs will be changed.

Object Namespace

If a namespace is given, the namespace of object URIs will be changed.

Graph Namespace

If a namespace is given, the namespace of Graph URIs will be changed.

Global graph name

Graph name used for all the triples to be deleted.

Subject Prepend

If chosen, the subject namespace will always be prepended.

Predicate Prepend

If chosen, the predicate namespace will always be prepended.

Object Prepend

If chosen, the object namespace will always be prepended.

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Workflows

• 07_SPARQL_DELETE_QueryKNIME Hub
• 10_Using_Semantic_Web_to_generate_Simpsons_TagCloudKNIME Hub

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