GeoMetadata
Overview
GeoMetadata includes a generic subset of metadata about the geographic data.
The GeoMetadata node belongs to the Geospatial component and requires at least level 1, its default container field is children. It is available from X3D version 3.0 or higher.
Hierarchy
1
2
3
4
+ X3DNode
+ X3DChildNode
+ X3DInfoNode
+ GeoMetadata (X3DUrlObject)*
* 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] description “”
Author-provided prose that describes intended purpose of the url asset.
Hint
- Many XML tools substitute XML character references for special characters automatically if needed within an attribute value (such as & for & ampersand character, or " for “ quotation-mark character).
SFBool [in, out] load TRUE
load=true means load immediately, load=false means defer loading or else unload a previously loaded scene.
Hints
- Allows author to design when Inline loading occurs via user interaction, event chains or scripting.
- Use a separate LoadSensor node to detect when loading is complete.
MFString [in, out] url [ ] [URI]
Hypertext link to an external, complete metadata description.
Hints
- MFString arrays can have multiple values, so separate each individual string by quote marks “https://www.web3d.org” “https://www.web3d.org/about” “etc.”
- Alternative XML encoding for quotation mark “ is " (which is an example of a character entity).
- Can replace embedded blank(s) in url queries with %20 for each blank character.
- X3D Scene Authoring Hints, urls
Warning
- Strictly match directory and filename capitalization for http links! This is important for portability. Some operating systems are forgiving of capitalization mismatches, but http/https url addresses and paths in Unix-based operating systems are all case sensitive and intolerant of uppercase/lowercase mismatches.
SFTime [in, out] autoRefresh 0 [0,∞)
autoRefresh defines interval in seconds before automatic reload of current url asset is performed.
Hints
- If preceding file loading fails or load field is false, no refresh is performed.
- Repeated refresh attempts to reload currently loaded entry of url list. If that fails, the browser retries other entries in the url list.
Warning
- Automatically reloading content has security considerations and needs to be considered carefully.
SFTime [in, out] autoRefreshTimeLimit 3600 [0,∞)
autoRefreshTimeLimit defines maximum duration that automatic refresh activity can occur.
Hint
- Automatic refresh is different than query and response timeouts performed by a networking library while sequentially attempting to retrieve addressed content from a url list.
Warning
- Automatically reloading content has security considerations and needs to be considered carefully.
MFString [in, out] summary [ ]
The summary string array contains a set of keyword/value pairs, with each keyword and its subsequent value contained in separate strings.
Hints
- Example
<GeoMetadata summary=' "title" "San Francisco, California USA" '/>. - Table 25.5, GeoMetadata keywords and values
- There should always be an even (or zero) number of strings to match key-value paired strings.
MFNode [in, out] data [ ]
#IMPLIED] DEF list of all nodes that implement this data. If no specific geospatial nodes are identified, then this GeoMetadata node pertains to entire scene.
Advice
Hints
- X3D for Advanced Modeling (X3D4AM) slideset
- When parent node is LoadSensor, apply
containerField='children'(X3Dv4) orcontainerField='watchList'(X3Dv3).
Warning
- Requires X3D
profile='Full'or else include<component name='Geospatial' level='1'/>