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= Preferences > Validator Settings =

In this preference settings, you can activate only the tests you need. By default, all error and warning tests are active.

These are the validations performed by the validator:

|| || Validation || Description || How to fix ||
|| [[Image(source:/trunk/images/data/error.png)]] ||Duplicated nodes||Checks that there are no nodes in the very same location||Merge the nodes into only one, adding the properties from all nodes to the merged one||
|| [[Image(source:/trunk/images/data/error.png)]] ||Duplicated way nodes||Checks that ways contain no loop edges (i.e., a single step from a node to itself)||Split the way, and delete the way consisting of the loop edge.||
|| [[Image(source:/trunk/images/data/error.png)]] ||Reversed coastline: land not on left side||Checks for coastlines that are not counter-clockwise or that are otherwise misplaced (coastline misused as inland lake)||Reverse coastline||
|| [[Image(source:/trunk/images/data/error.png)]] ||Unconnected coastline: coastline ways do not form closed loops||Checks for coastlines ways that are not connected to the end of other coastline ways|| ||
|| [[Image(source:/trunk/images/data/error.png)]] ||Unordered coastline: coastline ways are not connected start-to-end||Checks for coastline ways of which either the start is not connected to the end of another coastline or the end is not connected to the start of another coastline||Reverse coastline||
||[[Image(source:/trunk/images/data/error.png)]]||Incomplete ways||Checks for ways with zero or only one node||Removes the way||
|| ||Check property keys||Checks misspelled property keys. See the [source:/trunk/data/words.cfg words.cfg] for file of misspelled property keys||Replace wrong key with right one||
|| ||Check property values||Checks misspelled property values. Uses the [TaggingPresets tagging presets] file for checking||Correct spelling||
|| ||Empty properties||Checks for properties with empty values||Remove the empty properties||
|| [[Image(source:/trunk/images/data/warning.png)]] ||Crossing ways||Checks for ways (with highway/railway/waterway tags) that crosses in same layer with no crossing node||Add appropriate layer (and possibly bridge or tunnel)||
|| ||Unordered ways||Checks that all segments in a way are properly ordered||Reorder the way||
|| [[Image(source:/trunk/images/data/warning.png)]] ||Overlapping (high)ways||Checks for two (high)ways that share the same nodes||Remove the double (high)way||
|| [[Image(source:/trunk/images/data/warning.png)]] ||Self-intersecting ways||Check if a way crosses itself||Remove the self-crossing, remove overlapping parts or split way||
|| [[Image(source:/trunk/images/data/warning.png)]] ||Similar named ways||Checks for ways with very similar names, possibly a typo||Fix names or ignore false warning||
|| [[Image(source:/trunk/images/data/warning.png)]] ||Unclosed ways||Checks that way types, which should be closed really are closed||Close unclosed ways||
|| [[Image(source:/trunk/images/data/warning.png)]] ||Untagged ways||Checks for untagged ways||Either describe them correctly or remove ways when useless||
|| [[Image(source:/trunk/images/data/warning.png)]] ||Way end node near other highway|| End point of a way is very near to other ways || Connect the ways or when really unconnected set a 'noexit' tag to prevent further warnings ||
|| [[Image(source:/trunk/images/data/warning.png)]] ||Style for outer way mismatches||Within a multipolygon relation, one of the tags of the relation and the outer ways is shared but with different values||Copy relation related tags to the relation itself||
|| [[Image(source:/trunk/images/data/warning.png)]] ||Style for inner way equals multipolygon||Within a multipolygon relation, one of the tags of the relation and the outer ways is shared and has the same value||Remove tag from inner way
|| [[Image(source:/trunk/images/data/other.png)]] ||FIXMES||Checks for any property with the word "FIXME" inside||Resolve the mentioned issue||
|| [[Image(source:/trunk/images/data/other.png)]] ||Highway without a reference||Checks if there is a [[Key:ref|ref tag]] for highways that are tagged tertiary. Not always required, see for instance [[NL:Map_Features#Wegen]]||Add ref property or ignore
|| [[Image(source:/trunk/images/data/other.png)]] ||Key 'x' invalid. - ...||Check for illegal key combinations, names and similar issues||Fix the issue when possible||
|| [[Image(source:/trunk/images/data/other.png)]] ||Nodes with the same name||Check if two nodes have equal name||Join nodes when possible, ignore otherwise||
|| [[Image(source:/trunk/images/data/other.png)]] ||Overlapping areas||Checks if areas overlap||Remove overlapping only when really wrong.||
|| [[Image(source:/trunk/images/data/other.png)]] ||Unknown propery value||Checks for proper use of tags||Remove or change incorrectly used tag||
|| [[Image(source:/trunk/images/data/other.png)]] ||Untagged and unconnected nodes||Checks rogue nodes||Delete unused nodes when they have no further tags||
|| [[Image(source:/trunk/images/data/other.png)]] ||No style in multipolygon relation||The multipolygon relation is missing a tag describing what it represents||For a building, add building=yes to the relation etc.||

== See also ==
 * [wiki:/Help/Dialog/Validator Validator dialog]
 * [wiki:/Help/HowTo/ValidatorExamples Some examples] howto use validator

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