[Gvsig_english] querying a shapefile

[Nik Go]

Hello. Happy new year to all.

I have a shapefile of cities, is it possible to do the following in QGIS

   - determine and visually display all cities with attribute "x" or "y"
   - find out if the "x" cities share a border with other "x" cities
      - if they do, I want to add an attribute to the database indicating it
      as a neighbor of another "x" city
   - find out if the "y" cities share a border with other "y" cities
      - if they do, I want to add an attribute to the database indicating it
      as a neighbor of another "y" city

Thank you and regards.

Nik
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