parse_gml_data()

static POINTARRAY* parse_gml_data ( xmlNodePtr  xnode, bool *  hasz, int *  root_srid  )

static

Parse data coordinates.

There's several ways to encode data coordinates, who could be mixed inside a single geometrie:

• gml:pos element
• gml:posList element
• gml:pointProperty
• gml:pointRep (deprecated in 3.1.0)
• gml:coordinate element with tuples string inside (deprecated in 3.1.0)
• gml:coord elements with X,Y(,Z) nested elements (deprecated in 3.0.0)

Definition at line 974 of file lwgeom_in_gml.c.

{
        POINTARRAY *pa = 0, *tmp_pa = 0;
        xmlNodePtr xa, xb;
        gmlSrs srs;
        bool found;
 
        pa = NULL;
 
        for (xa = xnode ; xa != NULL ; xa = xa->next)
        {
                if (xa->type != XML_ELEMENT_NODE) continue;
                if (!is_gml_namespace(xa, false)) continue;
                if (xa->name == NULL) continue;
 
                if (is_gml_element(xa, "pos"))
                {
                        tmp_pa = parse_gml_pos(xa, hasz);
                        if (pa == NULL) pa = tmp_pa;
                        else pa = ptarray_merge(pa, tmp_pa);
 
                }
                else if (is_gml_element(xa, "posList"))
                {
                        tmp_pa = parse_gml_poslist(xa, hasz);
                        if (pa == NULL) pa = tmp_pa;
                        else pa = ptarray_merge(pa, tmp_pa);
 
                }
                else if (is_gml_element(xa, "coordinates"))
                {
                        tmp_pa = parse_gml_coordinates(xa, hasz);
                        if (pa == NULL) pa = tmp_pa;
                        else pa = ptarray_merge(pa, tmp_pa);
 
                }
                else if (is_gml_element(xa, "coord"))
                {
                        tmp_pa = parse_gml_coord(xa, hasz);
                        if (pa == NULL) pa = tmp_pa;
                        else pa = ptarray_merge(pa, tmp_pa);
 
                }
                else if (is_gml_element(xa, "pointRep") ||
                         is_gml_element(xa, "pointProperty"))
                {
                        found = false;
                        for (xb = xa->children ; xb != NULL ; xb = xb->next)
                        {
                                if (xb->type != XML_ELEMENT_NODE) continue;
                                if (!is_gml_namespace(xb, false)) continue;
                                if (is_gml_element(xb, "Point"))
                                {
                                        found = true;
                                        break;
                                }
                        }
                        if (!found || xb == NULL)
                                gml_lwpgerror("invalid GML representation", 29);
 
                        if (is_xlink(xb)) xb = get_xlink_node(xb);
                        if (xb == NULL || xb->children == NULL)
                                gml_lwpgerror("invalid GML representation", 30);
 
                        tmp_pa = parse_gml_data(xb->children, hasz, root_srid);
                        if (tmp_pa->npoints != 1)
                                gml_lwpgerror("invalid GML representation", 31);
 
                        parse_gml_srs(xb, &srs);
                        if (srs.reverse_axis) tmp_pa = ptarray_flip_coordinates(tmp_pa);
                        if (*root_srid == SRID_UNKNOWN) *root_srid = srs.srid;
                        else if (srs.srid != *root_srid)
                                gml_reproject_pa(tmp_pa, srs.srid, *root_srid);
                        if (pa == NULL) pa = tmp_pa;
                        else pa = ptarray_merge(pa, tmp_pa);
                }
        }
 
        if (pa == NULL) gml_lwpgerror("invalid GML representation", 32);
 
        return pa;
}

References get_xlink_node(), gml_lwpgerror(), gml_reproject_pa(), is_gml_element(), is_gml_namespace(), is_xlink(), parse_gml_coord(), parse_gml_coordinates(), parse_gml_pos(), parse_gml_poslist(), parse_gml_srs(), ptarray_flip_coordinates(), ptarray_merge(), struct_gmlSrs::reverse_axis, struct_gmlSrs::srid, and SRID_UNKNOWN.

Referenced by parse_gml_curve(), parse_gml_line(), parse_gml_linearring(), parse_gml_patch(), parse_gml_point(), parse_gml_polygon(), and parse_gml_triangle().

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