Search for a Structure

When giving the data the database have to be searched for, the following rules have to be used:

• give the different items, separated by commas - for example Bi,O will return all of the structures which chemical formulae contains Bi or O;
• if you want to find the structures where given data is necessary to exist, precede this item with "+" - for example +Bi,O will return all of the structures which contain Bi and may or may not contain O, and +Bi,+O will return only the structures which contain Bi and O;
• if you want that some item does not exists in the structure than precede it with "-" sign -- for example +Bi,-O will return all of the structures which contain Bi and do not contain O.