Examples: An official document issued by an authority used to authorize different types of trade in CITES specimen (e.g. certificate of origin, re-export certificate). (Source: CITES); Use of phytosanitary procedures leading to the issue of a phytosanitary certificate. (Source: FAO, 1990)

The formal assertion in writing that a commodity, service or other product has attained a recognized and relatively high grade or level of excellence. (Source: GEMET-BLD / RHW) - in environmental terms:[...] has attained a recognized or standardized level of environmentally sound production (drafted)