Advanced overpass query

Question

I have query:

< area-query ref="3600438171" /> 
< recurse type="node-way"/> 
< union> <query type="way"> 
< item/> 
< has-kv k="highway" v="cycleway" /> 
< /query> 
< recurse type="way-node"/> 
< /union> 
< print mode="meta" />

I need help with correct:

how to get parent relation of way
how to get tag UNION, i.e. result with < has-kv k="highway" v="cycleway" /> OR < has-kv k="cycleway" />

Thanks

Accepted Answer

To get the union of both "highway=cycleway" and "cycleway", you can use a (nested) "union". Please note that we need a separate variable name "all_ways" in this case to use the found ways twice:

    <area-query ref="3600438171"/>
    <recurse type="node-way" into="all_ways"/>
    <union>
      <union>
        <query type="way">
          <item set="all_ways"/>
          <has-kv k="highway" v="cycleway"/>
        </query> 
        <query type="way">
          <item set="all_ways"/>
          <has-kv k="cycleway"/>
        </query> 
      </union>
      <recurse type="way-node"/>
    </union>
    <print mode="meta"/>

To get the parent relation of the way, please add a further recurse statement. This adds the parent relations only.

    <area-query ref="3600438171"/>
    <recurse type="node-way" into="all_ways"/>
    <union>
      <union into="selected_ways">
        <query type="way">
          <item set="all_ways"/>
          <has-kv k="highway" v="cycleway"/>
        </query> 
        <query type="way">
          <item set="all_ways"/>
          <has-kv k="cycleway"/>
        </query> 
      </union>
      <recurse from="selected_ways" type="way-relation"/>
      <recurse from="selected_ways" type="way-node"/>
    </union>
    <print mode="meta"/>

If you want further the child elements of this parent relation, please add yet another recurse. But this can return very much data if you have hit a road network, a national border or another large relation:

    <area-query ref="3600438171"/>
    <recurse type="node-way" into="all_ways"/>
    <union>
      <union into="selected_ways">
        <query type="way">
          <item set="all_ways"/>
          <has-kv k="highway" v="cycleway"/>
        </query> 
        <query type="way">
          <item set="all_ways"/>
          <has-kv k="cycleway"/>
        </query> 
      </union>
      <recurse from="selected_ways" type="way-relation"/>
      <recurse type="down"/>
      <recurse from="selected_ways" type="way-node"/>
    </union>
    <print mode="meta"/>

Advanced overpass query

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