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Geometry Element

A特征映射规则可能包含一个可选的element that specifies the construction of the FME feature’s geometry through ageometry builder. Ageometry builder可以构建以下几何形状之一：

  1. point geometry: is a single coordinate geometry, the coordinate maybe x,y, or x,y,z. When this geometry is given to the FME feature, the feature’sXML_TYPE.attribute is set toXML_POINT..
  2. 线几何：是折线，它包含至少2个坐标，坐标可以是x，y或x，y，z。当该几何形状给出FME功能时，该功能的功能XML_TYPE.attribute of the feature is set toxml_line.
  3. 区域几何：是单个封闭的折线，甜甜圈或甜甜圈的骨料/或简单的封闭折线。坐标可以是x，y或x，y，z。当该几何形状给出FME功能时，该功能的功能XML_TYPE.attribute of the feature is set toxml_area.
  4. 均匀的聚集几何形状: is a collection of like geometries. A member of the aggregate may itself be an aggregate as long its xml_type matches. When this geometry is given to the FME feature, the feature’sXML_TYPE.attribute of the feature is set to eitherXML_POINT., xml_line,或者xml_area.
  5. heterogenous aggregate geometry：是一系列几何形状，可能彼此不同。这种聚合类型的成员可以是任何类型的几何形状。当对FME功能提供此几何形状时，该功能的功能的XML_TYPE属性设置为xml_aggregate.
  6. 文本几何: is a text value, a size and a rotation and a location. When this text geometry is given to the FME feature, the feature’sXML_TYPE.attribute of the feature is set toxml_text.
  7. 路径几何: a curve geometry composed of curve segments. A curve segment maybe a a line or an arc. When this path geometry is given to the FME feature, the feature’sXML_TYPE.attribute of the feature is set toxml_line.
  8. arc geometry:an arc geometry is a circular or elliptical curve segment, see thexml-arc, xml-arc-by-center-point,和xml-elliptical-arc几何构建器，用于支持的电弧定义。当该路径几何形状给出FME功能时，该功能的XML_TYPE.attribute of the feature is set toxml_arc.
  9. 表面几何形状: is a surface geometry composed of three dimensional areas. When this surface geometry is given to the FME feature, the feature’sXML_TYPE.attribute of the feature is set toxml_surface.
  10. 坚实的几何形状: is a solid geometry composed of three dimensional surfaces. When this solid geometry is given to the FME feature, the feature’sXML_TYPE.attribute of the feature is set toxml_solid.

The元素有一个启用attribute that specifies the name of a geometry builder. For a geometry builder to do anything useful (that is, construct a geometry), we must supply it with data, we can do this with thegeometry buildersdata parameters. The data is supplied through the元素的孩子elements. The general form of a元素是：

    ...

In a特征映射规则theelement must come after the和<属性>elements.

Later in this section, the XML Reader’s built-ingeometry builders和their data parameters are described, custom geometry builders are described in their own sections. In order to understand how a geometry builder constructs the geometry of a FME feature we first explain the states of a geometry builder.