package mlt

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Column are top-level types in the schema

Used in: FeatureTableSchema

• string name = 1

• bool nullable = 2

  specifies if the values are optional in the column and a present stream should be used

• ColumnScope columnScope = 3

• oneof type

  • ScalarColumn scalarType = 4

  • ComplexColumn complexType = 5

Used in: Column

• FEATURE = 0

  1:1 Mapping of property and feature -> id and geometry

• VERTEX = 1

  For M-Values -> 1:1 Mapping for property and vertex

The type tree is flattened in to a list via a pre-order traversal Represents a column if it is a root (top-level) type or a child of a nested type

Used in: Column

• oneof type

  • ComplexType physicalType = 4

  • LogicalComplexType logicalType = 5

• repeated Field children = 6

  The complex type Geometry and the logical type BINARY have no children since there layout is implicit known. RangeMap has only one child specifying the type of the value since the key is always a vec2<double>.

Used in: Field

• oneof type

  • ComplexType physicalType = 1

  • LogicalComplexType logicalType = 2

• repeated Field children = 3

Used in: ComplexColumn, ComplexField

• GEOMETRY = 0

• STRUCT = 1

Used in: TileSetMetadata

• string name = 1

• repeated Column columns = 2

Fields define nested or leaf types in the schema as part of a complex type definition

Used in: ComplexColumn, ComplexField

• optional string name = 1

  name and nullable are only needed in combination with a struct not for vec, list and map Map -> has the order key type, value type

• optional bool nullable = 2

• oneof type

  • ScalarField scalarField = 3

  • ComplexField complexField = 4

Used in: ComplexColumn, ComplexField

• BINARY = 0

  physical type: list<UInt8>

• RANGE_MAP = 1

  physical type: map<vec2<double, T>> -> special data structure which can be used for a efficient representation of linear referencing

Used in: ScalarColumn, ScalarField

• ID = 0

Used in: Column

• bool longID = 1

  this belongs elsewhere, but is here for now

• oneof type

  • ScalarType physicalType = 4

  • LogicalScalarType logicalType = 5

Used in: Field

• oneof type

  • ScalarType physicalType = 1

  • LogicalScalarType logicalType = 2

Used in: ScalarColumn, ScalarField

• BOOLEAN = 0

• INT_8 = 1

• UINT_8 = 2

• INT_32 = 3

• UINT_32 = 4

• INT_64 = 5

• UINT_64 = 6

• FLOAT = 7

• DOUBLE = 8

• STRING = 9

• int32 version = 1

• repeated FeatureTableSchema featureTables = 2

• optional string name = 3

• optional string description = 4

• optional string attribution = 5

• optional int32 minZoom = 6

• optional int32 maxZoom = 7

• repeated double bounds = 8

  order left, bottom, right, top in WGS84

• repeated double center = 9

  order longitude, latitude in WGS84