taplint: Tests TAP services
taplint runs a series of tests on a Table Access Protocol
service and reports the results. Unlike most of the other tools in
this package it is not likely to be of use to normal users;
its intended use is for people developing or operating TAP services
to assess their services, perhaps with a view to improving compliance.
Testing takes place in a number of stages; it is possible to choose
which stages are run in by using the
The default output (
is line-based text to standard output,
and each report line is of the (fairly greppable) form:
T-SSS-MMMMxN aaaaa...where the parts have the following meanings:
T: Report type, one of E(rror), W(arning), I(nfo), S(ummary), F(ailure). See the documentation of the
reportparameter for further description of what these mean. The
reportparameter can be used to suppress some of these; only
Eindicates actual service compliance errors, but including the others may make it easier to see what's going on.
SSS: Stage abbreviation, as used in the
stagesparameter can be used to select which stages are run.
MMMM: Message label, which is always the same for messages generated by the same test, is usually different for messages generated by different tests, and may be somewhat mnemonic.
x: Continuation indicator, either "
-" or "
+". In most cases it is "
-", indicating the first line of a message, but multi-line messages (rare) use "
-" for the first line and "
+" for any continuation lines.
N: Sequence number, which is 1 for the first time message
T-SSS-MMMMis reported, and increases by one for each subsequent appearance. After a certain maximum (determined by the
maxrepeatparameter) additional reports with the same code are no longer output individually, but a summary of the number of reports so discarded is written at the end of the section with the character "
x" instead of the sequence number. This behaviour prevents the output being swamped by multiple reports of the same issue. If the
maxrepeatparameter is increased above 9, more than one digit will be used here (so e.g. for maxrepeat=999, the format would be
aaaaa...: Message text, a free text description of what is being reported.
If you don't like that format, others may be selected using the
format parameter, which currently also supports JSON.
For more flexible interaction with the output you can invoke
and supply your own
TAP is a complicated beast, referencing many standards
and it is hard to write a validator which is comprehensive, especially
one which can provide useful output for services with a range of
This tool tries to make a wide range of tests, but does not claim to
be comprehensive. An idea of what tests it does perform can be gained
from the stages listed in the description of the
parameter. It does make a fairly good job of checking that declared
metadata is consistent and matches the data actually returned from queries,
and it tests job submission in most of the various ways permitted by the TAP
standard. Things it does not test much include complex ADQL queries,
coordinate/STC-related data types, queries in non-ADQL languages,
and service registration.