The breakpoint set definition element, breakpointDef, is used to define a list of comma-separate values that define the coordinate values along one axis of a gridded linear function value table. It contains a mandatory bpID, a file-unique XML identifier attribute, an optional name and units-of-measure attributes, an optional text description element and the comma-separated list of floating-point values in the bpVals element. This list must be monotonically increasing in value.
breakpointDef* : bpID, [name, units]
description? :
bpVals :
(character data of comma-separated breakpoints)
breakpointDef attributes:
- bpID
An XML-legal name that is unique within the file.
- name
A UNICODE name for the set (may be same as bpID).
- units
The units-of-measure for the breakpoint values. See the section on Conventions below.
breakpointDef sub-elements:
- description
An optional text description of the breakpoint set.
- bpVals
A comma-separated, monotonically-increasing list of floating-point values.
Example�6.�Two examples of breakpointDef elements
<!-- ===================== --> <!-- ========================= BREAKPOINT SETS ========================= --> <!-- ===================== --> <breakpointDef name="Mach" bpID="XMACH1_PTS" units=""><description> Mach number breakpoints for all aero data tables </description> <bpVals> 0.3, 0.6, 0.8, 0.9, 0.95, 1.1, 1.2, 1.6, 2.0, 2.5, 3.0, 3.5, 4.0
</bpVals> </breakpointDef> <breakpointDef name="Lower body flap" bpID="DBFL_PTS" units="deg"> <description>Lower body flap deflections breakpoints for tables</description> <bpVals>0., 15., 30., 45., 60.</bpVals> </breakpointDef>
Two breakpoint sets are defined which are used in the function element given below (example 8). Breakpoint sets XMACH1_PTS and DBFL_PTS contain values for Mach and lower body flap deflection, respectively, which are used to look up function values in several gridded function tables; one example is given below in example 7.