filter by type

[stefanocudini]

an additional filter in addition to -tags would be useful

called -type with one of the following values; node, way, relation

Use-cases

useful to further subdivide the output obtained by types

for example house numbers and streets

[missinglink]

In the case of house numbers, these can be either nodes or ways.
For streets, these can be either ways or relations.

The only reliable way of determining the 'class' of an object is through the tags.
Maybe I'm not understanding the use-case, could you provide a more concrete example of how you would use this feature?