Simplified features from the aviation domain, such as aerodrome and runway.  These features are not intended for storage or transmission, merely simplified variants of aviation concepts that can be referenced from other packages.  <br /></p><p><br /></p><p>There are two independent issues involved in referencing aviation features:<br /></p><p><ol><li>using AICM/AIXM classes directly for these concepts would introduce a dependency on AICM/AIXM, which is a package of significant size and complexity</li><br /></p><p><li>web-accessible, machine-readable, managed definitions for these concepts (such as the location, capabilites, and other information for the 'HTKJ' aerodrome) do not exist in an unified and authoritative form.  This information is managed independently and inconsistently by many organizations related to the aviation domain</li><br /></p><p></ol><br /></p><p>This package follows the traditional approach used in weather TAC formats, which is to include sufficient information in the data for consumers to identify the referenced aerodrome, FIR, or other feature.<br /></p><p><br /></p><p>The current version of this package represents the bare minimum of information needed by METAR, SPECI, TAF, and SIGMET. These concepts should not be considered a replacement or alternative to AICM/AIXM equivalents, most classes in this package are only suitable for basic referencing purposes such as the use of xlink in XML documents.<br /></p><p><br /></p><p>These concepts are represented in a way that is intended to be largely consistent with AICM/AIXM, but a detailed consistency analysis has not yet been attempted.<br /></p>