|  |  |  | Rasqal RDF Query Library Manual |  | 
|---|---|---|---|---|
            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);
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.
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 * uri; | source URI | 
| raptor_uri * name_uri; | name of graph for RASQAL_DATA_NAMED | 
| int flags; | RASQAL_DATA_GRAPH_NAMEDorRASQAL_DATA_GRAPH_BACKGROUND | 
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.
| uri: | source URI | 
| name_uri: | name of graph (or NULL) | 
| flags: | RASQAL_DATA_GRAPH_NAMEDorRASQAL_DATA_GRAPH_BACKGROUND | 
| Returns : | a new rasqal_data_graph or NULL on failure. | 
void rasqal_free_data_graph (rasqal_data_graph *dg);
Destructor - destroy a rasqal_data_graph object.
| dg: | rasqal_data_graph object | 
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.
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.
| dg: | rasqal_data_graph object | 
| fh: | the FILE* handle to print to |