===============
osm@spline Xapi
===============

Aim
============

We like to rewrite some parts of the XApi needed for our own application. Our 
aim is not get a full implementation of the Xapi, but to answer only specific 
requests, at low latency. For this subset of Xapi we want completly cover the 
original api. 

Requests
=============

This is a list of example requests, we want to optimize.

* xapi.spline.de/api/0.6/node[amenity=*]
* xapi.spline.de/api/0.6/node[highway=busstop]
* xapi.spline.de/api/0.6/node[bbox=-6,50,2,61]
* xapi.spline.de/api/0.6/node[amenity=hospital][bbox=-6,50,2,61]

a more formal description
-------------------------

We serve the node endpoint, but no others. We implment the tag based filtering,
for only one tag and a bounding box.

database shema 
================

We keep data in a highly specioaliced shema, that allows us to prevent tables
growing to big. And supports our requests at maximum speed. 

|  CREATE TABLE <tagname>:<tagvalue> (
|       {bigint id}
|       {longitude float4},
|       {latitude float4},
|       {object varchar}
|  ) PRIMARY KEY id;

Implmentation
=============

Teilprobleme:
..............

1. Database import

mögliche Technologien:
* Osmosis- plugin
* selbst in python (Protobuf consumer, async pgsql schreiber)


2. Web API
..............

mögliche Technologien:
* node.js