Hi, I have some design question about current OL.Format.KML implementation, of the networklink element and it's usage.
Current implementation of usage of KML format in OpenLayers is, that you define vector layer, url, strategies (which can modify the url), protocol (Script would be nice, but HTTP in this case) and format (OL.Format.KML). 1) Strategy (e.g. OL.Strategy.BBOX) can add (using defaultFilter for example) bounding box element to the URL (&bbox=minx,miny,maxx,maxy) or other parameters (as said, using defaultFilter and custom filterToParams method). Again: the url of the KML file *can be modified*. The KML read() method parses the comming data. But KML does not need to include any features, but just some raw dataset definition with network link, from where the features can be downloaded. The target can be server component, which serves dynamically desired features, based on incomming parameters (e.g. bbox, but also time and others). Some of the parameters are appended to the URL for example by Google Earth automatically. BUT OpenLayers.Format.KML does not enable (or I did not found any way how to do that) way, how to append custom parameters to network-link url. In the format, there is no reference to the layer - the format is not "aware of" any mapping context. And so, it is not possible to apply any filter/strategy to network-link KML. And I would consider this as missing feature. I've found some solution to this (manually adding layer attribute to the format and redefine the OpenLayers.Format.KML.fetchLink(href) method (and fix the href). But is that the proper way? I hope, you understand my point, thanks for your comments. Jachym -- Jachym Cepicky Help Service - Remote Sensing s.r.o. jachym.cepi...@gmail.com HS-RS: jac...@hsrs.cz http://bnhelp.cz http://les-ejk.cz
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