- XML (Extensible Markup Language) Reader/Writer
- XML Quick Facts
- Workbench XML Reader Parameters
- Workbench XML Writer Parameters
- Feature Representation
- Mapping File Reference
- 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
- Expression Elements (Extract and Literal)
- Expression Sequence
- Feature Mapping Rules
- FME Feature Construction
- Feature Type Element
- Attributes Element
- FME Feature Construction (defining mapping rules under the <feature-content-map> element)
- Attribute Element (handling multiple values)
- Attribute Element (handling optional attributes)
- Attribute Element (sequenced attributes)
- Attribute Element (Nillable Attributes)
- Geometry Element
- Geometry Builder States (activation, execution, suspension, and de-activation)
- Geometry Construction
- Composite Geometry Builders
- Built-in Geometry Builders
- Mapping Segmented Geometric Information
- Geometry Traits (trait element)
- FME Feature Construction (constructing multiple features at a time)
- Structure Element
- References Element
- Apply References Element
- Group Mapping Rules
- Reference Mapping Rules
- Mapping Rules (Optional Elements)
- More Expression Elements
- FME Schema Features
- Reading the Input XML Document
You are here: Popular FormatsXML (Extensible Markup Language) Reader/WriterxfMapFeature Mapping RulesGeometry Construction
It is possible to activate several geometry builders at a time. We can think of it as a stack of activated geometry builders, each builder is pushed into the stack when activated and popped when it is de-activated.
An activated geometry builder B constructs exactly one type of geometry. When B de-activates, exactly two things may happen:
- the geometry constructed by B is given to the FME feature: this occurs only if B is also the last activated geometry builder.
- the geometry constructed by B is given to a previous geometry builder Bt: When B de-activates and B is not the last activated geometry builder, then the top activated geometry builder in the stack, say Bt, receives and integrates the geometry constructed by B into its own. For this to be meaningful, Bt must be willing to accept a geometry constructed by another geometry builder.