Multiple id query (id: )

[mmd-osm]

After extending (user: ) and (uid: ) to multiple entries, we apply the same logic to the item query for a faster, more compact query. Due to possible conflicts with a bbox filter, an additional prefix (id: is introduced in this patch. The single value variant rel(1234) is left untouched, of course.

Currently used approaches as seen in the wild:

1. Union statement:

[out:csv(::id)];
(rel(341906);rel(356889);rel(356892);rel(356911);rel(356912); ... );

2. Build inputset step by step

[out:csv(::id)];(.a;rel(341906);)->.a;(.a;rel(356889);)->.a;(.a;rel(356892);)->.a;
(.a;rel(356911);)->.a;(.a;rel(356912);)->.a;(.a;rel(356943);)->.a;(.a;rel(356958);)->.a;
(.a;rel(356959);)->.a;(.a;rel(356992);)->.a;(.a;rel(357112);)->.a;(.a;rel(357113);)->.a;
(.a;rel(357245);)->.a;(.a;rel(357246);)->.a;(.a;rel(357247);)->.a;(.a;rel(357773);)->.a;
(.a;rel(357785);)->.a;(.a;rel(357786);)->.a;(.a;rel(357787);)->.a;(.a;rel(357789);)->.a;
(.a;rel(357794);)->.a;(.a;rel(357795);)->.a;(.a;rel(357798);)->.a;(.a;rel(357800);)->.a;
(.a;rel(357805);)->.a;(.a;rel(357815);)->.a;(.a;rel(357816);)->.a;

Streamlined (id: ) filter:

Link to test case: http://overpass-turbo.eu/s/kYk

[out:csv(::id)];
rel(id:341906,356889,356892,356911,356912,356943,356958,
356959,356992,357112,357113,357245,357246,357247,357773,357785,
357786,357787,357789,357794,357795,357798,357800,357805,357815,
357816,357817,357839,357840,357872,357873,357884,357885,358571,
358572,358573,358574,358575,358576,358594,358601,358602,358609,
358613,358621,358622,358623,358624,358625,358626,358627,358631,
358647,358651,358662,358663,358672,358673,358674,358675,358676,
358678,358679,358680,358681,358682,358683,358684,358685,358686,
358690,358691,358692,358693,358694,358695,358696,358707,358708,
358709,358710,358711,358722,358727,358733,358734,358735,358736,
358737,358742,358743,358744,358752,358753,358754,358755,358759,
358760,358761,358766,358767,358768,358769,358774,358775,358776,
358778,358779,358785,358786,358789,358790,358794,358795,359195,
359218,359219,359220,359221,359250,359251,359252,359253,359259,
359260,382313,532759,722196,722197,722198,722201,722202,722220);
rel._(changed:"2016-12-18T23:00:54.219200Z");out ids;

[drolbr]

Thank you for the patch. There are some minor coding issues, i.e. unecessary post-increment. I'll address that in a subsequent commit.