11. The method of claim 10 , further comprising: indexing the plurality of metadata resources, wherein the indexing generates text indexes with respect the textual information in the plurality of metadata resources, and structure indexes storing information on relationship paths between pairs of metadata resources in the plurality of metadata resources; wherein the searching is based on the text indexes and the structure indexes.
11. The method of claim 10 , further comprising: indexing the plurality of metadata resources, wherein the indexing generates text indexes with respect the textual information in the plurality of metadata resources, and structure indexes storing information on relationship paths between pairs of metadata resources in the plurality of metadata resources; wherein the searching is based on the text indexes and the structure indexes. 14. The method of claim 11 , wherein the relationship paths comprise: direct relationship paths between pairs of metadata resources; relationship paths including an equivalence relationship between pairs of metadata resources; and relationship paths including a containment relationship between pairs of metadata resources.