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Contents
Preface

Virtuoso Functions Guide

Administration
Aggregate Functions
Array Manipulation
BPEL APIs
Backup
Compression
Cursor
Date & Time Manipulation
Debug
Dictionary Manipulation
Encoding & Decoding
File Manipulation
Free Text
Hashing / Cryptographic
LDAP
Locale
Mail
Miscellaneous
Number
Phrases
RDF data
Remote SQL Data Source
Replication
SOAP
SQL
String
Transaction
Type Mapping
UDDI
User Defined Types & The CLR
Virtuoso Java PL API
Virtuoso Server Extension Interface (VSEI)
Web & Internet
XML
XPATH & XQUERY
and
append
assign
avg
boolean
ceiling
concat
contains
count
create-attribute
create-comment
create-element
create-pi
current
distinct
doc
document
document-literal
empty
ends-with
every
except
false
filter
floor
fn:collection
for
format-number
function-available
generate-id
id
if
intersect
is_after()
is_before()
key
lang
last
let
list()
local-name
max
min
name
namespace-uri
normalize-space
not
number
or
position
processxquery
processxslt
processxsql
progn()
replace()
round
serialize
shallow
some
starts-with
string
string-length
substring
substring-after
substring-before
sum
system-property
text_contains()
translate
true
tuple()
union
unordered
unparsed-entity-uri
urlify
xmlview

Functions Index

tuple()

Selects the first item of every argument sequence and returns the sequence of the selected items
sequence tuple() ( seq1 sequence, seq2 sequence, ... , seqN sequence);
Description

This function calculates all given arguments from left to right, and creates a sequence which contains the first item of the first calculated sequence, then the first item of the second calculated sequence and so on. If the value of an argument is not a sequence, but a scalar, the scalar is treated as one-element sequence so it is added into the result. If the value of an argument is an empry sequence, the empty string is added into the result.

This function is not a part of XPATH 1.0 or XQUERY 1.0 libraries of standard functions.

Parameters
SeqI – The sequence of items, first of its items will be used as I-tn item of the resulting sequence
Return Types

Sequence

Examples

tuple(/title, /abstract, /intro)