Attribute Class: S-57 Attribute Name

Prohibited for ENC - if present, this comment indicates this attribute is prohibited in an S-57 ENC.


Acronym: six-character code for the attribute

Code: integer code used in coding the data

Attribute type: one-character code for the attribute type - there are six possible types:

Enumerated ("E") - the expected input is a number selected from a list of predefined attribute values; exactly one value must be chosen.

List ("L") - the expected input is a list of one or more numbers selected from a list of pre-defined attribute values.

Float ("F") - the expected input is a floating point numeric value with defined range, resolution, units and format.

Integer ("I") - the expected input is an integer numeric value with defined range, units and format.

Coded String ("A") - the expected input is a string of ASCII characters in a predefined format; the information is encoded according to defined coding systems.

Free Text ("S") - the expected input is a free-format alphanumeric string; it may be a file name which points to a text or graphic file.

Expected input: depending on the attribute type, the expected input is defined in the following ways:

- for "E" and "L"-type attributes, a list of ID-numbers with associated, defined, meanings is given

- for "A", "F", "I" and "S"-type attributes, the expected input is indicated in accordance with the type

- where an attribute value which appeared in a previous edition of the S-57 Standard is no longer used, it is retained in the list but is struck-through (like this)

ENC Condition: if present, this comment indicates that for the Object Class(es) listed, a value for this attribute may be required under certain conditions.

Definitions: a definition of the attribute, or in the case of "E" or "L" type attributes, a definition of each value of an attribute.

Minimum value: the minimum value for the expected input is indicated for floating point and integer attributes.

Maximum value: the maximum value for the expected input is indicated for floating point and integer attributes.

References: provide guidelines used in the definition and description of attributes:

"INT 1": reference to the number of the equivalent paper chart feature in the "International Chart Series INT 1 - Symbols, Abbreviations, Terms used on Charts".

"M-4": reference to the paragraph number in the "Chart Specifications of the IHO", publication M-4.

Remarks: under "Remarks" further comments and notes may be given.

Depending on the type of attribute, the following information is provided:

Indication: for coded string ("S") type attributes, it indicates the construction of the string; for integer ("I") and floating point ("F") type attributes it indicates the units and resolution of the input.

Format: indicates the recommended standard input template; attributes that are identified as requiring a mandatory format, are indicated by the term (mandatory); for other attributes, the format can be either implied by the domain of valid attribute values, or will be variable in length depending on the attribute and its data type.

Example: an example of coded input.