MetadataSet
Overview
MetadataSet contains a list of Metadata* nodes that each have containerField='value' and together provide information about the parent node of the MetadataSet. Further information about this specific MetadataSet node may be provided by a single child Metadata* node with containerField='metadata'.
The MetadataSet node belongs to the Core component and requires at least support level 1, its default container field is value. It is available from X3D version 3.0 or higher.
Hierarchy
1
2
+ X3DNode
+ MetadataSet (X3DMetadataObject)*
* Derived from multiple interfaces.
Fields
SFNode [in, out] metadata NULL [X3DMetadataObject]
Information about this node can be contained in a MetadataBoolean, MetadataDouble, MetadataFloat, MetadataInteger, MetadataString or MetadataSet node.
Hint
SFString [in, out] name “”
Depending on the metadata vocabulary, the attribute name is usually required for metadata nodes.
Hints
- Well-defined names can simplify design and debugging through improved author understanding.
- X3D Scene Authoring Hints, Naming Conventions
Warning
- name field is not included if this instance is a USE node, in order to avoid potential mismatches.
SFString [in, out] reference “”
Reference to the metadata standard or definition defining this particular metadata value.
MFNode [in, out] value [ ] [X3DMetadataObject]
The value field provides a list of X3DMetadataObject nodes whose meaning is determined by the name field.
Advice
Hints
- Typically use
containerField='value'if the parent node is MetadataSet. - Explicitly defining containerField for Metadata nodes is always allowed and also unambiguous across each version of X3D.
- Each of the Metadata nodes are allowed as top-level root nodes in a scene, if doing that be sure to explicitly define
containerField='metadata'. - If present, an IS statement is the first child within any other node.
- An IS statement precedes any sibling Metadata* node, which in turn precedes any other sibling nodes.
- MetadataSet can contain other MetadataSet nodes.
- Comments are not readable when a model file is loaded for viewing, but WorldInfo and Metadata* nodes are persistent and inspectable at run time.
- X3D for Web Authors, Chapter 15, Metadata Information
Warnings
- Default
containerField='metadata'in X3D 3 changed to defaultcontainerField='value'in X3D 4.0, allowing construction of much terser MetadataSet vocabulary structures. - Metadata nodes can only contain other Metadata nodes.