ISO 10303-214:2010(E)
A Surface_texture_parameter is a combination of a parameter name and possibly indices describing one particular parameter of a surface texture such as roughness or waviness.
The meaning of the Surface_texture_parameter is defined by the measuring method that is specified by the using Default_surface_texture or Surface_texture
EXAMPLE A typical Surface_texture_parameter according to ISO 4287 [17] is Ra; in this case, the parameter name is 'R' and the index is 'a'.
NOTE Qualifier such as 'min' or 'max' may be assigned using the subtypes of Value_with_unit.
The data associated with a Surface_texture_parameter are the following:
The described_texture specifies the surface texture that is described by the Surface_texture_parameter.
See surface_texture_parameter to default_surface_texture and surface_texture_parameter to surface_texture for the application assertions.
There shall be exactly one object that defines the described_texture for a Surface_texture_parameter.
The parameter_index specifies an index that specifies the name of the Surface_texture_parameter further.
The parameter_index need not be specified for a particular Surface_texture_parameter.
The parameter_name specifies the word or group of words by which the Surface_texture_parameter is referred to.
EXAMPLE Parameter names defined in ISO 4287 are, e.g., sampling or evaluation length 'l', primary profile parameter 'P', roughness profile parameter 'R', and waviness profile parameter 'W'. Parameter indices defined in ISO 4287 are, e.g., maximum peak height 'p', maximum valley depth 'v', maximum height 'y', mean height 'c', total height 't', arithmetical mean deviation 'a', and root mean square deviation 'q'.
EXAMPLE Parameter names defined in ISO 12085 are, e.g., mean spacing of roughness motifs 'AR', mean depth of roughness motifs 'R', mean spacing of waviness motifs 'AW', and mean depth of waviness motifs 'W'.
The parameter_value specifies the value of the Surface_texture_parameter.
See surface_texture_parameter to value_with_unit for the application assertion.
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