rvp(1) - f30

1RVP(1)                      General Commands Manual                     RVP(1)
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NAME

6       rvp - Relax NG validation pipe
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SYNOPSIS

10       rvp {-q|-s|-v|-h} {schema.rnc}
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OPTIONS

14       -q     returns only error numbers, suppresses messages
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16       -s     takes less memory and runs slower
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18       -v     prints current version
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20       -h     displays usage summary and exits
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DESCRIPTION

24       RVP  is  abbreviation for Relax NG Validation Pipe. It reads validation
25       primitives from the standard input and reports result to  the  standard
26       output;  it's main purpose is to ease embedding of a Relax NG validator
27       into various languages and environment. An application would launch RVP
28       as  a parallel process and use a simple protocol to perform validation.
29       The protocol, in BNF, is:
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31        query ::= (
32        quit
33        | start
34        | start-tag-open
35        | attribute
36        | start-tag-close
37        | text
38        | end-tag) z.
39        quit ::= "quit".
40        start ::= "start" [gramno].
41        start-tag-open ::= "start-tag-open" patno name.
42        attribute ::= "attribute" patno name value.
43        start-tag-close :: = "start-tag-close" patno name.
44        text ::= ("text"|"mixed") patno text.
45        end-tag ::= "end-tag" patno name.
46        response ::= (ok | er | error) z.
47        ok ::= "ok" patno.
48        er ::= "er" patno erno.
49        error ::= "error" patno erno error.
50        z ::= "\0" .
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53       RVP assumes that the last colon in a name separates the local  partfrom
54       the  namespace  URI  (it is what one gets if specifies `:' as namespace
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57       Error codes can be grabbed from rvp sources by grep _ER_.h  and  OR-ing
58       them  with  corresponding  masks from erbit.h. Additionally, error 0 is
59       the protocol format error.
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61       Either er or error responses are returned, not both; -q chooses between
62       concise and verbose forms (invocation syntax described later).
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64       Start  passes the index of a grammar (first grammar in the list of com‐
65       mand-line arguments has number 0); if  the  number  is  omitted,  0  is
66       assumed.
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68       Quit is not opposite of start; instead, it quits RVP.
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EXAMPLES

72       To  assist  embedding RVP, samples in Perl and Python are provided. The
73       scripts use Expat wrappers for each of the  languages  to  parse  docu‐
74       ments; they take a Relax NG grammar (in the compact syntax) as the com‐
75       mand line argument and read the XML from the standard input. For  exam‐
76       ple, the following commands validate rnv.dbx against docbook.rnc:
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78        perl rvp.pl docbook.rnc < rnv.dbx
79        python rvp.py docbook.rnc < rnv.dbx
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81       The scripts are kept simple and unobscured to illustrate the technique,
82       rather than being  designed  as  general-purpose  modules.  Programmers
83       using  Perl,  Python, Ruby and other languages are encouraged to imple‐
84       ment and share reusable RVP-based components  for  their  languages  of
85       choice.
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HOMEPAGE

89       http://sourceforge.net/projects/rnv/
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AUTHOR

93       Michael Simacek <msimacek@redhat.com>.  This man page was made from the
94       readme written by RNV's author David Tolpin <dvd@davidashen.net>.
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