List of Supported Formats

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• XML (Extensible Markup Language) Reader/Writer
  • XML Quick Facts
  • Workbench XML Reader Parameters
  • Workbench XML Writer Parameters
  • Feature Representation
    • No Geometry
    • Points
    • Lines
    • Area
    • Text
    • Surfaces
    • Solids
    • Aggregate
  • Mapping File Reference
    • Reader Overview
      • Reader Mapping File Directives
    • Writer Overview
      • Writer Mapping File Directives
    • Writer DEF Lines
      • Using the XML Writer in Append Mode
    • Writer Example
  • xfMap
    • Reading the Input XML Document
      • Mapping Rules
      • Types of Mapping Rules
      • Match and Except Expression
      • Specifying Several Match Expressions for One Mapping Rule
      • Limiting Mapping Rule Activation with Except Expressions
      • Mapping Rule States (activation, execution, suspension, and de-activation)
      • Using Force Elements During Mapping Rule Activation and Deactivation
    • Search-sets
      • Contents of an Active-search-set (Default Contents)
    • Expression Elements (Extract and Literal)
      • Extract Expressions
      • Literal Expressions
      • Example
    • Expression Sequence
    • Feature Mapping Rules
      • FME Feature Construction
      • Feature Type Element
      • Attributes Element
      • FME Feature Construction (defining mapping rules under the element)
      • Attribute Element (handling multiple values)
      • Attribute Element (handling optional attributes)
      • Attribute Element (sequenced attributes)
      • Attribute Element (Nillable Attributes)
      • 几何Element
      • 几何Builder States (activation, execution, suspension, and de-activation)
      • 几何Construction
      • Composite Geometry Builders
      • Built-in Geometry Builders
        • xml-point
        • xml-point-xy
        • xml-line
        • xml-area
        • xml-donut
        • xml-aggregate
        • xml-box
        • xml-text
        • xml-path
        • xml-arc
        • xml-arc-by-center-point
        • xml-elliptical-arc
        • xml-circle
        • xml-polygon
        • xml-face
        • xml-composite-surface
        • xml-triangulated-surface
        • xml-enclosed-surface
        • xml-composite-solid
        • xml-multi-point
        • xml-multi-curve
        • xml-multi-area
        • xml-multi-text
        • xml-multi-surface
        • xml-multi-solid
        • xml-null
        • xml-reverse-geometry
        • fme-geometry
      • Mapping Segmented Geometric Information
      • 几何Traits (trait element)
      • FME Feature Construction (constructing multiple features at a time)
      • Structure Element
      • References Element
      • Apply References Element
    • Group Mapping Rules
      • Group Construction and Destruction
      • Group Attribute-Sets
      • Group Pipelines
      • Condition Element
      • Persistent Groups
    • Reference Mapping Rules
      • Reference-Set Construction and Destruction
      • Reference-Sets
      • Persistent Reference-Sets
      • refexpr Expressions
      • Example
    • Mapping Rules (Optional Elements)
      • Signature Element
      • Expression Element (parmval Expressions)
      • Use-Mappings Element (supplying the parameters)
      • Use-Mappings Element (implicit arguments)
      • Use-Mappings Element (limiting the active-search-set)
      • Define Element
    • More Expression Elements
      • defnval Expressions
      • strexpr Expressions
      • tclexpr Expressions
      • counter Expressions
      • maprule Expressions
      • selexpr Expressions
      • matched Expressions
      • 关键字表达式
      • fmefunc Expressions
      • logexpr表达式
      • comparison Expressions
      • uuid Expressions
      • directive_Expressions
    • FME Schema Features
      • Scanning for FME Schema Features
      • Generating FME Schema Features
      • Inline FME Schema Features

Types of Mapping Rules

A mapping rule must be defined inside anorelement, whereXmay be substituted by eitherfeature,group, orreference. This means that the containing element determines the mapping rule’s type.

Allmapping rules, regardless of their type, are represented in xfMap by theelement. A mapping rule has the following form:

The types of mapping rule and their corresponding containing elements are:

• feature mapping rules: These specify the construction of FME features, and they must be defined inside theorelements.
• group mapping rules: These specify the construction of xfMap groups, and they must be defined inside theorelements.
• reference mapping rules: These specify the construction of xfMap references, and they must be defined inside theorelements.

Each mapping rule type will be described in separate sections:Feature Mapping Rules,Group Mapping Rules, andReference Mapping Rules.

The following section describes the mapping rule’s match expression and states. Every mapping rules may also contain some optional elements, which are discussed inMapping Rules (Optional Elements).