The optional IfThenElseFeatureRules element is a set of rules for selecting the number or density of hit points for a feature and/or a strategy to use for selecting the hit points and/or a substitute feature algorithm. The first rule that applies is used to set the quantity of hit points and/or the strategy and/or the algorithm.
The required n attribute is the number of rules in this list, which is the number of if-then-rules plus one for the else-rule if present.
Source
<xs:element name="IfThenElseFeatureRules" type="IfThenElseFeatureRulesType" minOccurs="0"><xs:annotation><xs:documentation>The optional IfThenElseFeatureRules element is a set of rules for selecting the number or density of hit points for a feature and/or a strategy to use for selecting the hit points and/or a substitute feature algorithm. The first rule that applies is used to set the quantity of hit points and/or the strategy and/or the algorithm.</xs:documentation></xs:annotation></xs:element>
The optional MaxFeatureRules element is a set of rules for selecting the number or density of hit points for a feature and/or a strategy to use for selecting the hit points and/or a substitute feature algorithm. The largest value returned by all rules that apply is used to set the quantity of hit points. If the rules that apply give different point sampling strategies or substitute feature algorithms, the evaluating system may use any of those strategies or algorithms.
The required n attribute is the number of rules in this list, which is the number of if-then-rules plus one for the else-rule if present.
Source
<xs:element name="MaxFeatureRules" type="MaxFeatureRulesType" minOccurs="0"><xs:annotation><xs:documentation>The optional MaxFeatureRules element is a set of rules for selecting the number or density of hit points for a feature and/or a strategy to use for selecting the hit points and/or a substitute feature algorithm. The largest value returned by all rules that apply is used to set the quantity of hit points. If the rules that apply give different point sampling strategies or substitute feature algorithms, the evaluating system may use any of those strategies or algorithms.</xs:documentation></xs:annotation></xs:element>
The FeatureRulesType defines two methods of setting the quantity of hit points to use for a feature and/or a strategy to use for selecting the hit points and/or the substitute feature algorithm to use to fit the feature to the hit points. If the IfThenElseFeatureRules and MaxFeatureRules are both used to find the quantity of points for a feature, both sets of rules should be applied and the maximum value should be used. Also if both are used and they give different point sampling strategies or different substitute feature algorithms, the evaluating system may use any of those strategies or algorithms. Since a given feature F may be associated with zero to many characteristics C1 ... Cn, if there is any characteristic associated with F, the rules should be evaluated for each FCi pair, and the number or density of hit points to use for F should be set to the maximum value. If a number of hit points must be compared with a density of hit points, the evaluating system should find and use the area of the feature to convert density values to numbers of points. So that a single rules file may be used in different situations, the rules include a SamplingCategoryIs Boolean expression that tests whether the sampling category is equal to a particular value. If a set of rules includes one or more rules containing a SamplingCategoryIs test, the rules are to be evaluated in an environment in which the sampling category has been set to some positive integer. The meaning of a sampling category is determined by whoever writes the rules. For example, 1 might mean first article inspection while 5 means process control. As another example, Sampling categories 1 through 3 might represent LOW, MEDIUM, and HIGH, respectively. An alternative to using rules containing SamplingCategoryIs tests is to write a separate rules file for each category. Numerical quantities that are constants, feature parameters, or characteristic parameters may be used in conditions. The numerical quantities FeatureLength and FeatureArea may also be used in conditions. The evaluating system must set the value of FeatureLength for the feature being processed if FeatureLength is used in any condition. The evaluating system must set the value of FeatureArea for the feature being processed if FeatureArea is used in any condition. The rules are not intended for picking the quantity of points or point sampling strategy to use for measuring a characteristic that is not associated with any feature.
<xs:complexType name="FeatureRulesType"><xs:annotation><xs:documentation>The FeatureRulesType defines two methods of setting the quantity of hit points to use for a feature and/or a strategy to use for selecting the hit points and/or the substitute feature algorithm to use to fit the feature to the hit points. If the IfThenElseFeatureRules and MaxFeatureRules are both used to find the quantity of points for a feature, both sets of rules should be applied and the maximum value should be used. Also if both are used and they give different point sampling strategies or different substitute feature algorithms, the evaluating system may use any of those strategies or algorithms. Since a given feature F may be associated with zero to many characteristics C1 ... Cn, if there is any characteristic associated with F, the rules should be evaluated for each FCi pair, and the number or density of hit points to use for F should be set to the maximum value. If a number of hit points must be compared with a density of hit points, the evaluating system should find and use the area of the feature to convert density values to numbers of points. So that a single rules file may be used in different situations, the rules include a SamplingCategoryIs Boolean expression that tests whether the sampling category is equal to a particular value. If a set of rules includes one or more rules containing a SamplingCategoryIs test, the rules are to be evaluated in an environment in which the sampling category has been set to some positive integer. The meaning of a sampling category is determined by whoever writes the rules. For example, 1 might mean first article inspection while 5 means process control. As another example, Sampling categories 1 through 3 might represent LOW, MEDIUM, and HIGH, respectively. An alternative to using rules containing SamplingCategoryIs tests is to write a separate rules file for each category. Numerical quantities that are constants, feature parameters, or characteristic parameters may be used in conditions. The numerical quantities FeatureLength and FeatureArea may also be used in conditions. The evaluating system must set the value of FeatureLength for the feature being processed if FeatureLength is used in any condition. The evaluating system must set the value of FeatureArea for the feature being processed if FeatureArea is used in any condition. The rules are not intended for picking the quantity of points or point sampling strategy to use for measuring a characteristic that is not associated with any feature.</xs:documentation></xs:annotation><xs:sequence><xs:element name="IfThenElseFeatureRules" type="IfThenElseFeatureRulesType" minOccurs="0"><xs:annotation><xs:documentation>The optional IfThenElseFeatureRules element is a set of rules for selecting the number or density of hit points for a feature and/or a strategy to use for selecting the hit points and/or a substitute feature algorithm. The first rule that applies is used to set the quantity of hit points and/or the strategy and/or the algorithm.</xs:documentation></xs:annotation></xs:element><xs:element name="MaxFeatureRules" type="MaxFeatureRulesType" minOccurs="0"><xs:annotation><xs:documentation>The optional MaxFeatureRules element is a set of rules for selecting the number or density of hit points for a feature and/or a strategy to use for selecting the hit points and/or a substitute feature algorithm. The largest value returned by all rules that apply is used to set the quantity of hit points. If the rules that apply give different point sampling strategies or substitute feature algorithms, the evaluating system may use any of those strategies or algorithms.</xs:documentation></xs:annotation></xs:element></xs:sequence></xs:complexType>
