s57: merge update attributes into the base set - #47
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An update record contains only the changed attributes (S-57 sec. 8.4.2.1). The old code replaced the full attribute set. The attributes that the update did not contain were lost. The chart then showed those objects with the "?" symbol. The new code merges each changed attribute into the base set. A DEL value (0x7F) removes only its own attribute. All other attributes stay.
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An update record contains only the changed attributes (S-57 sec. 8.4.2.1). The old code replaced the full attribute set. The attributes that the update did not contain were lost. The chart then showed those objects with the "?" symbol.
The new code merges each changed attribute into the base set. A DEL value (0x7F) removes only its own attribute. All other attributes stay.