Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed
arrows point from an interface to procedures which implement that interface.
This could include the module procedures in a generic interface or the
implementation in a submodule of an interface in a parent module.
function write_piece_start_tag_unst(self,np,nc)result(error)!< Write `<Piece ...>` start tag for unstructured topology.class(xml_writer_abstract),intent(inout)::self!< Writer.integer(I4P),intent(in)::np!< Number of points.integer(I4P),intent(in)::nc!< Number of cells.integer(I4P)::error!< Error status.type(string)::tag_attributes!< Tag attributes.tag_attributes='NumberOfPoints="'//trim(str(n=np))//'" NumberOfCells="'//trim(str(n=nc))//'"'call self%write_start_tag(name='Piece',attributes=tag_attributes%chars())error=self%errorendfunction write_piece_start_tag_unst