mirror of
https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@166223 c90b9560-bf6c-de11-be94-00142212c4b1
271 lines
8.2 KiB
XML
271 lines
8.2 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.6 $ -->
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<!-- splitted from ./en/functions/yaz.xml, last change in rev 1.1 -->
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<refentry id="function.yaz-record">
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<refnamediv>
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<refname>yaz_record</refname>
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<refpurpose>Returns a record</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>string</type><methodname>yaz_record</methodname>
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<methodparam><type>resource</type><parameter>id</parameter></methodparam>
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<methodparam><type>int</type><parameter>pos</parameter></methodparam>
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<methodparam><type>string</type><parameter>type</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns the record at position <parameter>pos</parameter> or an empty
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string if no record exists at the given position.
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</para>
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<para>
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The <function>yaz_record</function> function inspects a record in the
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current result set at the position specified by parameter
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<parameter>pos</parameter>. If no database record exists at the given
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position an empty string is returned.
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</para>
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<para>
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Record positions in a result set are numbered 1, 2, ... $hits where
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$hits is the count returned by <function>yaz_hits</function>.
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</para>
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<para>
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The <parameter>type</parameter> specifies the form of the
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returned record.
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</para>
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<variablelist>
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<varlistentry>
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<term><literal>string</literal></term>
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<listitem>
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<para>
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The record is returned as a string for simple display.
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In this mode, all MARC records are converted to a line-by-line format
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since ISO2709 is hardly readable.
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XML records and SUTRS are returned in their original format.
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GRS-1 are returned in a (ugly) line-by-line format.
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</para>
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<para>
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This format is suitable if records are to be displayed in a quick
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way - for debugging - or because it is not feasible to perform
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proper display.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>xml</literal></term>
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<listitem>
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<para>
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The record is returned as an XML string if possible.
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In this mode, all MARC records are converted to
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<ulink url="&url.yaz-marcxml;">MARCXML</ulink>.
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XML records and SUTRS are returned in their original format.
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GRS-1 is not supported.
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</para>
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<para>
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This format is similar to <literal>string</literal> except that
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MARC records are converted to MARCXML
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</para>
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<para>
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This format is suitable if records are processed by an XML parser
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or XSLT processor afterwards.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>raw</literal></term>
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<listitem>
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<para>
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The record is returned as a string in its original form.
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This type is suitable for MARC, XML and SUTRS. It does not
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work for GRS-1.
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</para>
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<para>
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MARC records are returned as a ISO2709 string. XML and SUTRS are
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returned as strings.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>syntax</literal></term>
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<listitem>
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<para>
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The syntax of the record is returned as a string, i.e.
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<literal>USmarc</literal>, <literal>GRS-1</literal>,
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<literal>XML</literal>, etc.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>database</literal></term>
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<listitem>
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<para>
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The name of database associated with record at the position
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is returned as a string.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>array</literal></term>
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<listitem>
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<para>
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The record is returned as an array that reflects the GRS-1
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structure. This type is suitable for MARC and GRS-1. XML, SUTRS
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are not supported and if the actual record is XML or SUTRS an
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empty string will be returned.
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</para>
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<para>
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The array returned consists of a list corresponding to
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each leaf/internal node of GRS-1. Each list item consists
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a sub list with first element <emphasis>path</emphasis> and
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<emphasis>data</emphasis> (if data is available).
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</para>
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<para>
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The path which is a string holds a list of each tree component (of
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the structured GRS-1 record) from root to leaf. Each component is
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a tag type, tag value pair of the form
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<literal>(</literal><replaceable>type</replaceable><literal>,</literal>
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<replaceable>value</replaceable>
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</para>
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<para>
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String tags normally has a corresponding tag type 3.
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MARC can also be returned as an array (they are converted to
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GRS-1 internally).
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<note>
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<para>
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It is the application which is responsible for actually
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ensuring that the records are returned from the Z39.50/SRW server
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in the proper format. The type given only specifies a conversion
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to take place on the client side (in PHP/YAZ).
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</para>
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</note>
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<para>
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Besides conversion of the transfer record to a string/array, PHP/YAZ
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it is also possible to perform a character set conversion of the
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record. Especially for USMARC/MARC21 that is recommended since
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these are typically returned in the character set MARC-8 that is
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not supported by browsers, etc. To specify a conversion, add
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<literal>; charset=</literal><replaceable>from</replaceable><literal>,
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</literal><replaceable>to</replaceable> where
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<replaceable>from</replaceable> is the original character set
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of the record and <replaceable>to</replaceable> is the resulting character
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set (as seen by PHP).
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</para>
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<example>
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<title>Array for GRS-1 record</title>
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<para>
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Consider GRS-1 record
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<screen>
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(4,52)Robert M. Pirsig
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(4,70)
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(4,90)
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(2,7)Transworld Publishers, ltd.
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</screen>
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This record has two nodes at root level.
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First element at root level is (4,52)
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[tag type 4, tag value 52], and has data
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<literal>Robert M. Pirsig</literal>. Second element at root level
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(4,70) has a subtree with a single element (4,90). (4,90) has
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yet another sub tree (2,7) with data <literal>Transworld Publishers,
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ltd.</literal>.
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</para>
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<para>
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If this record is present at position $p, then
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<programlisting role="php">
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$ar = yaz_record($id, $p, "array");
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print_r($ar);
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</programlisting>
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produces
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<screen>
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Array
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(
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[0] => Array
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(
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[0] => (4,52)
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[1] => Robert M. Pirsig
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)
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[1] => Array
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(
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[0] => (4,70)
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)
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[2] => Array
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(
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[0] => (4,70)(4,90)
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)
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[3] => Array
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(
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[0] => (4,70)(4,90)(2,7)
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[1] => Transworld Publishers, ltd.
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)
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)
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</screen>
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</para>
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</example>
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<example>
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<title>Working with MARCXML</title>
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<para>
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The following PHP snippet returns a MARC21/USMARC record as
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MARCXML. The original record is returned in marc-8 (unknown
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to most XML parsers), so we convert it to UTF-8 (which all
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XML parsers must support).
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<programlisting role="php">
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$rec = yaz_record($id, $p, "xml; charset=marc-8,utf-8");
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</programlisting>
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</para>
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<para>
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The record <literal>$rec</literal> can be processed with
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the <link linkend="ref.xslt">Sablotron XSLT</link> processor as follows:
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</para>
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<para>
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<programlisting role="php">
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<![CDATA[
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$xslfile = 'display.xsl';
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$processor = xslt_create();
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$parms = array('/_xml' => $rec);
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$res = xslt_process($processor, 'arg:/_xml', $xslfile, NULL, $parms);
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xslt_free($processor);
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$res = preg_replace("'</?html[^>]*>'", '', $res);
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print $res;
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]]>
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</programlisting>
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</para>
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<para>
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For PHP5 the <link linkend="ref.xsl">XSL</link> extension can be
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used instead of Sablotron XSLT.
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</para>
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</example>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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