public MapData(
string nameSpace,
IEnumerable <LineDef> lineDefs,
IEnumerable <SideDef> sideDefs,
IEnumerable <Vertex> vertices,
IEnumerable <Sector> sectors,
IEnumerable <Thing> things,
string comment = "",
IEnumerable <UnknownProperty> unknownProperties = null,
IEnumerable <UnknownBlock> unknownBlocks = null)
{
NameSpace = nameSpace;
LineDefs.AddRange(lineDefs);
SideDefs.AddRange(sideDefs);
Vertices.AddRange(vertices);
Sectors.AddRange(sectors);
Things.AddRange(things);
Comment = comment;
UnknownProperties.AddRange(unknownProperties ?? Enumerable.Empty <UnknownProperty>());
UnknownBlocks.AddRange(unknownBlocks ?? Enumerable.Empty <UnknownBlock>());
AdditionalSemanticChecks();
}