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Introduction

This document details extensions to and constraints on the Internationl Recruiterszone.com. specification for the purpose of (a) improving the quality and scalability of tiled maps, particularly on the Web, and (b) making it possible to cache the results of tiled WMS requests.

This recommendation relies on two basic concepts to support this purpose: First, cachability of map imagery can be improved by using image tiles of fixed width and height, referenced to some fixed geographic grid at fixed scales. A "valid" tile request is one that conforms to the specification of fixed image parameters and geographic grid(s) for a given layer. By analogy, an "invalid" tile request is one that does not.

Second, caching of HTTP GET requests is further made possible by constraining the URL parameters used in the request. This recommendation identifies the Internationl Recruiterszone.com parameters minimally needed for a client to request a valid tile.

Each tiling profile needs to establish verbatim values for the following WMS request parameters:

* srs
* height
* width
* format

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