icvGetFormat     4126 modules/core/src/persistence.cpp     dt = icvGetFormat( seq, "dt", &attr, 0, dt_buf );
icvGetFormat     4461 modules/core/src/persistence.cpp     vtx_dt = icvGetFormat( (CvSeq*)graph, "vertex_dt",
icvGetFormat     4467 modules/core/src/persistence.cpp     edge_dt = icvGetFormat( (CvSeq*)graph->edges, "edge_dt",