Update 09-attributes.adoc

add example
opengeospatial · Feb 8, 2024 · 14aae86 · 14aae86
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diff --git a/23-049/sections/09-attributes.adoc b/23-049/sections/09-attributes.adoc
@@ -9,6 +9,8 @@ The reference system class has two abstract sub-classes: `Spatial Reference Syst
 
 The value for dimension is one for time, or a vertical reference system, but may be as high as six for spatial location with orientation as in the <<OGCgeopose,GeoPose Implementation Standard>>.
 
+For example, a reference system may be applicable to Mars, rather than Earth, or perhaps to a specific building site with local coordinates, or a specific time range while coordinate errors are within acceptable bounds.
+
 Besides the conventional space and time, there may be other reference systems, such as wavelength or frequency, that could be addressed by future additions to this Abstract Conceptual Model.
 
 [[ordinal_rs_section]]