observable.xsd GML conformant schema for definining Phenomenon Types. A phenomenon may be derived from other phenomena through constraints. A composite phenomenon may be derived by simple composition or by applying constraint set(s). SJDC 2002-12-24 Property containing a description of, or reference to, an Phenomenon Type. Property containing a description of, or reference to, an Phenomenon Type. Alternative name for axis. Property containing a description of, or reference to, an Phenomenon Type. Property carrying a reference to an Phenomenon Type definition. No content. single component phenomenon - either 1. simple definition 2. reference to a definition available elsewhere 3. parameterised by a single value on one or more auxilliary axes to be applied simultaneously phenomenon composed of several components 3. composite of discrete non-homogeneous component phenomena 4. parameterised by an explicit set of values on each of one or more axes to be applied simultaneously to generate a set of component phenomena 5. parameterised by an implicit set of values on each of one or more axes to be applied simultaneously to generate a set of component phenomena A series of equally spaced quantities described using an implicit form. limits - gives the low and high indices of the segment of the series axis - indicates the phenomenon which this series of values describes origin - gives the base position corresponding to the value with index=0 offset - gives the span increment used to generate the other values structure - indicates whether the positions in the series relate to point values or intervals structure indicates how the positions in the grid should be used to construct the members of the grid, with the values: point if the members have zero width, with the grid positions used directly, giving a total count of (high-low+1) post if the members have a width equal to the offset, and grid positions delimit cells, with a total count of (high-low) center if the members have a width equal to the offset, and grid cells are centered on the grid positions, with a total count of (high-low+1).