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I would like to do a Dijkstra routing using pgrouting and openlayers. I have the downloaded osm data. I am following the workshop given in this link. But since I am very new to this I found it difficult to understand this page.

Can anyone please explain me this page. Or provide me with some suggestions to do it in any other way.

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Sorry, but the link to Chapter 01 you posted has nothing to do with OpenLayers. And you better give more details about what you don't understand. Otherwise it's difficult to help you. – dkastl Jun 7 '12 at 9:32

You can use GeoExt if want to try it another way. Look at the official workshop as it's more up-to-date:

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