One of our main goals with GeoExt is to help bring open source principles to the creation and sharing of maps. To help make that happen we seek to develop components that make it easy to embed maps in one's own website, and indeed to remix an existing map in to something new.
The first step in this is very basic 'export' functionality, that allows a user to zoom in to an area, possibly add some layers, or turn the existing ones on and off, and then export an html snippet to embed in their own website or blog post.
Past the basics we seek to develop components that let users select which GeoExt controls they want to expose to others. So a builder type of application, but one that anyone could use from an existing GeoExt application. Combined with the ability to add remote WMS and WFS on the fly this should enable people to easily create new applications they can share with others.
The export functionality should also enable output in to different formats. Be able to put the current view on to Google Earth, or make a high quality PDF for printing. Also be able to export the data of the view as a shapefile or GML. And perhaps export as an OGC OWS context document.
Funding
This roadmap item is currently unfunded.
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Other Roadmap Items
Editing Toolbar and Components
Funded: While there is rich editing available in OpenLayers there are now good default toolbars to make use of these in GeoExt that work well with the different OpenLayers persistence mechanisms.
Versioned Editing Toolbar and Components
There have been several applications making use of the WFS-V 'versioning' protocol of GeoServer, to do operations like History, Diff and Rollback in addition to the standard editing. These should have default components in GeoExt so people can easily add rich versioning capabilities to their applications
GeoExt should provide components that make it easy to export the current map to a variety of formats. Foremost among these is embedding the current view to a webpage or blog. Past that it would be great to export in a variety of formats, like Google Earth, PDF, or as another GeoExt application with alternate controls.