sdo.sample.sequence.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Working with Sequenced Data Objects</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="sdo.sample.getset.html">Setting and Getting Property Values</a></div> <div class="next" style="text-align: right; float: right;"><a href="sdo.sample.reflection.html">Reflecting on Service Data Objects</a></div> <div class="up"><a href="sdo.examples.html">Examples</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="sdo.sample.sequence" class="section"> <h2 class="title">Working with Sequenced Data Objects</h2> <p class="para"> Sequenced data objects are SDOs which can track property ordering across the properties of a data object. They can also contain unstructured text elements (text element which do not belong to any of the SDO's properties). Sequenced data objects are useful for working with XML documents which allow unstructured text (i.e. mixed=true) or if the elements can be interleaved ( <div class="cdata"><pre><A/><B/><A/></pre></div>). This can occur for example when the schema defines maxOccurs>1 on a element which is a complexType with a choice order indicator. </p> <p class="para"> The examples below assume an SDO created with the following schema and instance information, using the XML Data Access Service. </p> <p class="para"> The schema below describes the format of a letter. The letter can optionally contain three properties; date, firstName, and lastName. The schema states <strong class="command">mixed="true"</strong> which means that unstructured text can be interspersed between the three properties. </p> <p class="para"> <div class="example-contents"><div class="cdata"><pre><xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:letter="http://letterSchema" targetNamespace="http://letterSchema"> <xsd:element name="letters" type="letter:FormLetter"/> <xsd:complexType name="FormLetter" mixed="true"> <xsd:sequence> <xsd:element name="date" minOccurs="0" type="xsd:string"/> <xsd:element name="firstName" minOccurs="0" type="xsd:string"/> <xsd:element name="lastName" minOccurs="0" type="xsd:string"/> </xsd:sequence> </xsd:complexType></xsd:schema></pre></div> </div> </p> <p class="para"> The following is an instance letter document. It contains the three letter properties; date, firstName and lastName, and has unstructured text elements for the address and letter body. </p> <p class="para"> <div class="example-contents"><div class="cdata"><pre><letter:letters xmlns:letter="http://letterSchema"> <date>March 1, 2005</date> Mutual of Omaha Wild Kingdom, USA Dear <firstName>Casy</firstName> <lastName>Crocodile</lastName> Please buy more shark repellent. Your premium is past due.</letter:letters></pre></div> </div> </p> <p class="para"> When loaded, the letter data object will have the sequence and property indices shown in the table below: <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Sequence Index</th> <th colspan="1">Property Index:Name</th> <th colspan="1">Value</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">0</td> <td colspan="1" rowspan="1" align="left">0:date</td> <td colspan="1" rowspan="1" align="left">March 1, 2005</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">1</td> <td colspan="1" rowspan="1" align="left">-</td> <td colspan="1" rowspan="1" align="left">Mutual of Omaha</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">2</td> <td colspan="1" rowspan="1" align="left">-</td> <td colspan="1" rowspan="1" align="left">Wild Kingdom, USA</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">3</td> <td colspan="1" rowspan="1" align="left">-</td> <td colspan="1" rowspan="1" align="left">Dear</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4</td> <td colspan="1" rowspan="1" align="left">1:firstName</td> <td colspan="1" rowspan="1" align="left">Casy</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">5</td> <td colspan="1" rowspan="1" align="left">2:lastName</td> <td colspan="1" rowspan="1" align="left">Crocodile</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">6</td> <td colspan="1" rowspan="1" align="left">-</td> <td colspan="1" rowspan="1" align="left">Please buy more shark repellent.</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">7</td> <td colspan="1" rowspan="1" align="left">-</td> <td colspan="1" rowspan="1" align="left">Your premium is past due.</td> </tr> </tbody> </colgroup> </table>⌨️ 快捷键说明
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