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Rasqal RDF Query Library Manual |  |
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Synopsis
rasqal_data_graph;
rasqal_data_graph* rasqal_new_data_graph (raptor_uri *uri,
raptor_uri *name_uri,
int flags);
void rasqal_free_data_graph (rasqal_data_graph *dg);
enum rasqal_data_graph_flags;
void rasqal_data_graph_print (rasqal_data_graph *dg,
FILE *fh);
Description
Data graphs are used in the query to describe RDF graphs that can be used to query against. The graphs can be used either with raptor_uri to name the graph, or without a name. The query language determines which graphs are used in the query.
Details
rasqal_data_graph
typedef struct {
raptor_uri* uri;
raptor_uri* name_uri;
int flags;
} rasqal_data_graph;
A source of RDF data for querying.
The uri is the original source (base URI) of the content. It may
also have an additional name name_uri as long as flags is
RASQAL_DATA_NAMED
raptor_uri * |
source URI |
raptor_uri * |
name of graph for RASQAL_DATA_NAMED
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int |
RASQAL_DATA_GRAPH_NAMED or RASQAL_DATA_GRAPH_BACKGROUND
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rasqal_new_data_graph ()
rasqal_data_graph* rasqal_new_data_graph (raptor_uri *uri, raptor_uri *name_uri, int flags);
Constructor - create a new rasqal_data_graph.
The name_uri is only used when the flags are RASQAL_DATA_GRAPH_NAMED.
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source URI |
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name of graph (or NULL) |
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RASQAL_DATA_GRAPH_NAMED or RASQAL_DATA_GRAPH_BACKGROUND
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Returns : |
a new rasqal_data_graph or NULL on failure. |
rasqal_free_data_graph ()
void rasqal_free_data_graph (rasqal_data_graph *dg);
Destructor - destroy a rasqal_data_graph object.
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rasqal_data_graph object |
enum rasqal_data_graph_flags
typedef enum {
RASQAL_DATA_GRAPH_NONE = 0,
RASQAL_DATA_GRAPH_NAMED = 1,
RASQAL_DATA_GRAPH_BACKGROUND = 2,
} rasqal_data_graph_flags;
Flags for the type of rasqal_data_graph.
These are used by rasqal_query_add_data_graph(). See rasqal_data_graph.
rasqal_data_graph_print ()
void rasqal_data_graph_print (rasqal_data_graph *dg, FILE *fh);
Print a Rasqal data graph in a debug format.
The print debug format may change in any release.
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rasqal_data_graph object |
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the FILE* handle to print to |