MOF++

Data › Nets › Which net is this?

Which net is this?

Upload a topology and this page will tell you whether it is a net the collection holds — by name, not by resemblance.

The answer rests on the canonical Systre key, which is an invariant of the net's quotient graph. The same net written in a different cell, with the vertices numbered differently, or with every coordinate nudged, gives the same key; two different nets do not. So this is an identification rather than a similarity score, and it answers yes or no rather than offering a ranking.

It identifies the net — the abstract periodic graph. It says nothing about the material a file came from, and it is not a search for a structure: coordination-sequence search is on the search page, and it answers a weaker question.

A .mfpx topology, or a .cgd holding a PERIODIC_GRAPH block. Both state their connectivity, which is the thing being asked about. A .cif or a plain coordinate file is not read: it states no connectivity, and deriving one from interatomic distances means picking a cutoff — which would make the answer depend on a choice you did not make and cannot see. Up to 4 MB.
Only for a .cgd holding more than one graph: the ID of the one you mean. A file with several and no choice is refused rather than having the first one picked for you.
Search by name instead

Your file is not kept. It is read into memory, its connectivity is taken, and the bytes are dropped when the request ends. Nothing is written to disk and nothing about the file is logged. Each identification starts a Systre process, so the form is rate-limited to 10 uploads every 5 minutes per client — enough for a working session, not enough to queue up the machine.

Same question from a script: POST /api/v1/nets/identify with the file as multipart file. It answers 200 for a match, 404 for none, 422 for a graph Systre will not key and 400 for a file that could not be read — so a client can branch on the status line. API documentation.