<slide>
<title>Importing OSM into MongoDB (2)</title>

<example>
{
    '_id': 'w4442243',
    'name' : 'Brondesbury Road',
    'tags': { 
        'highway': 'secondary',
        'ref' : 'B451',
        'source_ref' : 'OS OpenData StreetView',
    }
}
</example>
<blurb>Querying all secondary roads:</blurb>
<example>db.poi.find( { 'tags.highway' : 'secondary' } );</example>
<blurb>Find all roads:</blurb>
<example>db.poi.find( { 'tags.highway' : { $exists : true } );</example>
</slide>
