<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head profile="http://internetalchemy.org/2003/02/profile">
<link rel="foaf" type="application/rdf+xml" title="FOAF" href="http://www.openlinksw.com/dataspace/uda/about.rdf" />
<link rel="schema.dc" href="http://purl.org/dc/elements/1.1/" />
<meta name="dc.title" content="Function: and - Virtuoso Functions Guide" />
<meta name="dc.subject" content="Function: and - Virtuoso Functions Guide" />
<meta name="dc.creator" content="OpenLink Software Documentation Team ; " />
<meta name="dc.copyright" content="OpenLink Software, 1999 - 2009" />
<link rel="top" href="index.html" title="OpenLink Virtuoso Universal Server: Documentation" />
<link rel="search" href="/doc/adv_search.vspx" title="Search OpenLink Virtuoso Universal Server: Documentation" />
<link rel="parent" href="functions.html" title="Chapter Contents" />
<link rel="prev" href="appendixa.html" title="Appendix" />
<link rel="next" href="functions.html#.html" title="" />
<link rel="shortcut icon" href="../images/misc/favicon.ico" type="image/x-icon" />
<link rel="stylesheet" type="text/css" href="doc.css" />
<link rel="stylesheet" type="text/css" href="/doc/translation.css" />
<title>Function: and - Virtuoso Functions Guide</title>
<meta http-equiv="Content-Type" content="text/xhtml; charset=UTF-8" />
<meta name="author" content="OpenLink Software Documentation Team ; " />
<meta name="copyright" content="OpenLink Software, 1999 - 2009" />
<meta name="keywords" content="" />
<meta name="GENERATOR" content="OpenLink XSLT Team" />
</head>
<body>
<div id="header">
<a name="xpf_and" />
<img src="../images/misc/logo.jpg" alt="" />
<h1>22. Virtuoso Functions Guide - and</h1>
</div>
<div id="navbartop">
<div>
<a class="link" href="functions.html">Chapter Contents</a> | <a class="link" href="functions.html#xml" title="XML">Prev</a> | <a class="link" href="xpf_append.html" title="append">Next</a>
</div>
</div>
<div id="currenttoc">
<form method="post" action="/doc/adv_search.vspx">
<div class="search">Keyword Search: <br />
<input type="text" name="q" /> <input type="submit" name="go" value="Go" />
</div>
</form>
<div>
<a href="http://www.openlinksw.com/">www.openlinksw.com</a>
</div>
<div>
<a href="http://docs.openlinksw.com/">docs.openlinksw.com</a>
</div>
<br />
<div>
<a href="index.html">Book Home</a>
</div>
<br />
<div>
<a href="contents.html">Contents</a>
</div>
<div>
<a href="preface.html">Preface</a>
</div>
<br />
<div>
<a class="selected" href="functions.html">Virtuoso Functions Guide</a>
</div>
<br />
<div>
<a href="functions.html#admin">Administration</a>
</div>
<div>
<a href="functions.html#aggr">Aggregate Functions</a>
</div>
<div>
<a href="functions.html#array">Array Manipulation</a>
</div>
<div>
<a href="functions.html#bpel">BPEL APIs</a>
</div>
<div>
<a href="functions.html#backup">Backup</a>
</div>
<div>
<a href="functions.html#compression">Compression</a>
</div>
<div>
<a href="functions.html#cursors">Cursor</a>
</div>
<div>
<a href="functions.html#time">Date & Time Manipulation</a>
</div>
<div>
<a href="functions.html#debug">Debug</a>
</div>
<div>
<a href="functions.html#dict">Dictionary Manipulation</a>
</div>
<div>
<a href="functions.html#encoding">Encoding & Decoding</a>
</div>
<div>
<a href="functions.html#file">File Manipulation</a>
</div>
<div>
<a href="functions.html#ft">Free Text</a>
</div>
<div>
<a href="functions.html#hash">Hashing / Cryptographic</a>
</div>
<div>
<a href="functions.html#ldap">LDAP</a>
</div>
<div>
<a href="functions.html#localization">Locale</a>
</div>
<div>
<a href="functions.html#mail">Mail</a>
</div>
<div>
<a href="functions.html#misc">Miscellaneous</a>
</div>
<div>
<a href="functions.html#number">Number</a>
</div>
<div>
<a href="functions.html#phrz">Phrases</a>
</div>
<div>
<a href="functions.html#rdf">RDF data</a>
</div>
<div>
<a href="functions.html#rmt">Remote SQL Data Source</a>
</div>
<div>
<a href="functions.html#repl">Replication</a>
</div>
<div>
<a href="functions.html#soap">SOAP</a>
</div>
<div>
<a href="functions.html#sql">SQL</a>
</div>
<div>
<a href="functions.html#string">String</a>
</div>
<div>
<a href="functions.html#txn">Transaction</a>
</div>
<div>
<a href="functions.html#type">Type Mapping</a>
</div>
<div>
<a href="functions.html#uddi">UDDI</a>
</div>
<div>
<a href="functions.html#udt">User Defined Types & The CLR</a>
</div>
<div>
<a href="functions.html#vad">VAD</a>
</div>
<div>
<a href="functions.html#jvmpl">Virtuoso Java PL API</a>
</div>
<div>
<a href="functions.html#bif">Virtuoso Server Extension Interface (VSEI)</a>
</div>
<div>
<a href="functions.html#ws">Web & Internet</a>
</div>
<div>
<a href="functions.html#xml">XML</a>
</div>
<div>
<a class="selected" href="functions.html#XPATH">XPATH & XQUERY</a>
</div>
<div class="selected">
<div>
<a class="selected" href="xpf_and.html">and</a>
</div>
<div>
<a href="xpf_append.html">append</a>
</div>
<div>
<a href="xpf_assign.html">assign</a>
</div>
<div>
<a href="xpf_avg.html">avg</a>
</div>
<div>
<a href="xpf_boolean.html">boolean</a>
</div>
<div>
<a href="xpf_ceiling.html">ceiling</a>
</div>
<div>
<a href="xpf_concat.html">concat</a>
</div>
<div>
<a href="xpf_contains.html">contains</a>
</div>
<div>
<a href="xpf_count.html">count</a>
</div>
<div>
<a href="xpf_create_attribute.html">create-attribute</a>
</div>
<div>
<a href="xpf_create_comment.html">create-comment</a>
</div>
<div>
<a href="xpf_create_element.html">create-element</a>
</div>
<div>
<a href="xpf_create_pi.html">create-pi</a>
</div>
<div>
<a href="xpf_current.html">current</a>
</div>
<div>
<a href="xpf_distinct.html">distinct</a>
</div>
<div>
<a href="xpf_doc.html">doc</a>
</div>
<div>
<a href="xpf_document.html">document</a>
</div>
<div>
<a href="xpf_document_literal.html">document-literal</a>
</div>
<div>
<a href="xpf_empty.html">empty</a>
</div>
<div>
<a href="xpf_ends_with.html">ends-with</a>
</div>
<div>
<a href="xpf_every.html">every</a>
</div>
<div>
<a href="xpf_except.html">except</a>
</div>
<div>
<a href="xpf_false.html">false</a>
</div>
<div>
<a href="xpf_filter.html">filter</a>
</div>
<div>
<a href="xpf_floor.html">floor</a>
</div>
<div>
<a href="xpf_collection.html">fn:collection</a>
</div>
<div>
<a href="xpf_for.html">for</a>
</div>
<div>
<a href="xpf_format_number.html">format-number</a>
</div>
<div>
<a href="xpf_function_available.html">function-available</a>
</div>
<div>
<a href="xpf_generate_id.html">generate-id</a>
</div>
<div>
<a href="xpf_id.html">id</a>
</div>
<div>
<a href="xpf_if.html">if</a>
</div>
<div>
<a href="xpf_intersect.html">intersect</a>
</div>
<div>
<a href="xpf_is_after.html">is_after()</a>
</div>
<div>
<a href="xpf_is_before.html">is_before()</a>
</div>
<div>
<a href="xpf_key.html">key</a>
</div>
<div>
<a href="xpf_lang.html">lang</a>
</div>
<div>
<a href="xpf_last.html">last</a>
</div>
<div>
<a href="xpf_let.html">let</a>
</div>
<div>
<a href="xpf_list.html">list()</a>
</div>
<div>
<a href="xpf_local_name.html">local-name</a>
</div>
<div>
<a href="xpf_max.html">max</a>
</div>
<div>
<a href="xpf_min.html">min</a>
</div>
<div>
<a href="xpf_name.html">name</a>
</div>
<div>
<a href="xpf_namespace_uri.html">namespace-uri</a>
</div>
<div>
<a href="xpf_normalize_space.html">normalize-space</a>
</div>
<div>
<a href="xpf_not.html">not</a>
</div>
<div>
<a href="xpf_number.html">number</a>
</div>
<div>
<a href="xpf_or.html">or</a>
</div>
<div>
<a href="xpf_position.html">position</a>
</div>
<div>
<a href="xpf_processXQuery.html">processxquery</a>
</div>
<div>
<a href="xpf_processXSLT.html">processxslt</a>
</div>
<div>
<a href="xpf_processXSQL.html">processxsql</a>
</div>
<div>
<a href="xpf_progn.html">progn()</a>
</div>
<div>
<a href="xpf_replace.html">replace()</a>
</div>
<div>
<a href="xpf_round.html">round</a>
</div>
<div>
<a href="xpf_serialize.html">serialize</a>
</div>
<div>
<a href="xpf_shallow.html">shallow</a>
</div>
<div>
<a href="xpf_some.html">some</a>
</div>
<div>
<a href="xpf_starts_with.html">starts-with</a>
</div>
<div>
<a href="xpf_string.html">string</a>
</div>
<div>
<a href="xpf_string_length.html">string-length</a>
</div>
<div>
<a href="xpf_substring.html">substring</a>
</div>
<div>
<a href="xpf_substring_after.html">substring-after</a>
</div>
<div>
<a href="xpf_substring_before.html">substring-before</a>
</div>
<div>
<a href="xpf_sum.html">sum</a>
</div>
<div>
<a href="xpf_system_property.html">system-property</a>
</div>
<div>
<a href="xpf_text_contains.html">text_contains()</a>
</div>
<div>
<a href="xpf_translate.html">translate</a>
</div>
<div>
<a href="xpf_true.html">true</a>
</div>
<div>
<a href="xpf_tuple.html">tuple()</a>
</div>
<div>
<a href="xpf_union.html">union</a>
</div>
<div>
<a href="xpf_unordered.html">unordered</a>
</div>
<div>
<a href="xpf_unparsed_entity_uri.html">unparsed-entity-uri</a>
</div>
<div>
<a href="xpf_urlify.html">urlify</a>
</div>
<div>
<a href="xpf_xmlview.html">xmlview</a>
</div>
</div>
<br />
<div>
<a href="functionidx.html">Functions Index</a>
</div>
<br />
</div>
<div id="text">
<h2>and</h2>
<div class="refpurpose">Returns false if a value of some argument is false, otherwise returns true.</div>
<div class="funcsynopsis">
<span class="funcdef">boolean <span class="function">and</span>
</span>
(<span class="paramdef">
<span class="parameter">val1</span> boolean</span>,
<span class="paramdef">
<span class="parameter">val2</span> boolean</span>,
<span class="paramdef">
<span class="parameter">...</span>
</span>,
<span class="paramdef">
<span class="parameter">valN</span> boolean</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
This function calculates the values of its arguments from left to right.
If the value of the calculated parameter is false, the function returns false immediately,
without calculating the remaining parameters.
If the list of arguments ends without any false value calculated, the function
returns true (thus it will return true if called without arguments).
</p>
<p>
The name of this function is the same as the name of "and" XPATH and XQUERY operator.
Thus it must be surrounded by double quotes when used in XPATH or XQUERY expressions.
Moreover, this function is not a part of XPATH standard, so it cannot be used if
portability is important.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">vali – </span>
Value of boolean expression argument</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>boolean</p>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="xpf_ex_and" />
<div class="example">
<div class="exampletitle">Control over sequence of search operations</div>
<p>If two conditions must be checked, where one is simple and
another is hard to calculate, then "and" may be used to calculate
second condition only if first is true, to reduce average time of processing</p>
<div>
<pre class="screen">
"and" ( authors,
document(concat('http://www.lib20.org/findxml.cgi?isbn=',@isbn))/status[@outofprint='NO'] )
</pre>
</div>
</div>
</div>
<div class="refsect1">
<div class="refsect1title">See Also</div>
<p>
<a href="xpf_not.html">not</a>
<a href="xpf_or.html">or</a>
<a href="xpf_every.html">every</a>
</p>
</div>
</div>
<div id="footer">
<div>Copyright© 1999 - 2009 OpenLink Software All rights reserved.</div>
<div id="validation">
<a href="http://validator.w3.org/check/referer">
<img src="http://www.w3.org/Icons/valid-xhtml10" alt="Valid XHTML 1.0!" height="31" width="88" />
</a>
<a href="http://jigsaw.w3.org/css-validator/">
<img src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!" height="31" width="88" />
</a>
</div>
</div>
</body>
</html>
distrib
>
Fedora
>
14
>
x86_64
>
media
>
updates
>
by-pkgid
>
71d40963b505df4524269198e237b3e3
>
files
>
1017
