parse_tag_of_type
const struct dcp_parse_tag *tag = parse_tag_of_type(handle, DCP_TYPE_STRING);
const void *tag = parse_tag_of_type(handle, DCP_TYPE_INT64);
const struct dcp_parse_tag *tag = parse_tag_of_type(handle, DCP_TYPE_BOOL);
const struct dcp_parse_tag *tag = parse_tag_of_type(handle, DCP_TYPE_BLOB);
tag = parse_tag_of_type(it->handle, type);