Object Class: S-57 Object Class Name
ENC Group 1 Area Object - if present, this comment indicates this object class is part of S-57 ENC Group 1 ("Skin of the Earth").
Prohibited for ENC - if present, this comment indicates this object class is prohibited in an S-57 ENC.
Acronym: six-character code for the object class (and permitted ENC geometry: Point, or Line, or Area, or None)
Code: integer code used in coding the data
Attributes: for each object class, the set of relevant attributes is defined; these are divided into three subsets; each subset shows a list of the six-character attribute acronyms - refer to the attribute catalogue for a description of each attribute:
Set Attribute_A: attributes in this subset define the individual characteristics of an object.
Set Attribute_B: attributes in this subset provide information relevant to the use of the data, e.g. for presentation or for an information system.
Set Attribute_C: attributes in this subset provide administrative information about the object and the data describing it.
* - indicates Mandatory attributes - i.e. values must be provided;
# - indicates Conditional attributes - i.e. values may need to be provided - consult the attribute reference for details.
Definition: where possible each object class is defined and the source of the definition is quoted.
References: provide guidelines used in the definition and description of object classes:
"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.
Distinction: related but separate object classes are listed under the heading "Distinction".