mirror of
https://github.com/moparisthebest/xeps
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399 lines
20 KiB
XML
399 lines
20 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE xep SYSTEM 'xep.dtd' [
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<!ENTITY % ents SYSTEM 'xep.ent'>
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%ents;
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]>
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<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
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<xep>
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<header>
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<title>Data Forms Layout</title>
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<abstract>This specification defines a backwards-compatible extension to the XMPP Data Forms protocol that enables an application to specify form layouts, including the layout of form fields, sections within pages, and subsections within sections.</abstract>
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&LEGALNOTICE;
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<number>0141</number>
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<status>Draft</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XEP-0004</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>xdata-layout</shortname>
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<schemaloc>
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<url>http://www.xmpp.org/schemas/xdata-layout.xsd</url>
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</schemaloc>
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&linuxwolf;
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<revision>
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<version>1.0</version>
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<date>2005-05-12</date>
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<initials>psa</initials>
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<remark>Per a vote of the Jabber Council, advanced status to Draft.</remark>
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</revision>
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<revision>
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<version>0.3</version>
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<date>2005-05-03</date>
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<initials>psa</initials>
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<remark>Renamed <desc/> element to <text/> to avoid confusion with XEP-0004 element names; clarified formal definition of <text/> element; added <text/> elements to examples.</remark>
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</revision>
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<revision>
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<version>0.2</version>
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<date>2005-03-28</date>
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<initials>psa</initials>
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<remark>Editorial review: cleanup of text, examples, and schema.</remark>
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</revision>
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<revision>
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<version>0.1</version>
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<date>2004-08-10</date>
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<initials>lw</initials>
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<remark>Initial version.</remark>
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</revision>
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</header>
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<section1 topic='Introduction' anchor='intro'>
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<p>&xep0004; ("x:data") provides a simple and interoperable way to request and present information for both applications and humans. However, the simple nature of "x:data" requires the form renderer to use a generic "key/value" format. This document builds upon "x:data" to enable applications to specify additional layout information.</p>
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</section1>
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<section1 topic='Requirements' anchor='reqs'>
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<p>The requirements for this document are:</p>
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<ul>
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<li>Provide hints for the layout of form fields.</li>
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<li>Provide hints for the layout of sections within pages.</li>
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<li>Provide hints for the layout of subsections within sections.</li>
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<li>Ensure backwards-compatibility with the existing "x:data" protocol.</li>
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</ul>
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</section1>
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<section1 topic='Use Cases' anchor='usecases'>
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<p>This document defines a new namespace, "http://jabber.org/protocol/xdata-layout". All layout is defined by "pages" and "sections".</p>
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<p>All of the use cases refer to the following form:</p>
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<example caption='Sample form'><![CDATA[
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<x xmlns='jabber:x:data' type='form'>
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<title>XSF Application</title>
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<instructions>Please fill out this form</instructions>
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<field var='name.first' type='text-single' label='First Name'>
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<required/>
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</field>
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<field var='name.last' type='text-single' label='Last Name'>
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<required/>
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</field>
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<field var='email' type='text-single' label='E-mail Address'>
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<required/>
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</field>
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<field var='jid' type='jid-single' label='Jabber JID'>
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<required/>
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</field>
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<field var='background' type='text-multi' label='Background Information'>
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</field>
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<field var='future' type='text-multi' label='Jabber Plans for the Next Six Months'>
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</field>
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<field var='reasoning' type='text-multi' label='Reasons for Joining'>
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</field>
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<field var='activity.mailing-lists' type='text-multi' label='Recent Mailing List Activity'>
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</field>
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<field var='activity.xeps' type='text-multi' label='XEPs Authored or Co-Authored'>
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</field>
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</x>
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]]></example>
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<p>Note: Any newlines in the following examples are provided for the purpose of legibility only.</p>
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<section2 topic='Paging Fields' anchor='paging'>
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<p>One of the simplest layout usages is to partition fields into pages. This is done by including one or more <page/> elements within the x:data form. Each <page/> element SHOULD possess a "label" attribute to label the page, MAY contain a <text/> child element for additional information, and SHOULD contain a <fieldref/> element for each field to be included in the page. To reference an x:data field, the <fieldref/> element's "var" attribute MUST be the same as the intended <field/> element's "var" attribute.</p>
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<example caption='Pages of fields'><![CDATA[
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<x xmlns='jabber:x:data' type='form'>
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<title>XSF Application</title>
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<instructions>Please fill out this form</instructions>
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<page xmlns='http://jabber.org/protocol/xdata-layout' label='Personal Information'>
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<text>This is page one of three.</text>
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<text>
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Note: In accordance with the XSF privacy policy, your personal information will
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never be shared outside the organization in any way for any purpose; however,
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your name and JID may be published in the XSF membership directory.
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</text>
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<fieldref var='name.first'/>
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<fieldref var='name.last'/>
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<fieldref var='email'/>
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<fieldref var='jid'/>
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<fieldref var='background'/>
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</page>
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<page xmlns='http://jabber.org/protocol/xdata-layout' label='Community Activity'>
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<text>This is page two of three.</text>
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<text>
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We use this page to gather information about any XEPs you've worked on,
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as well as your mailing list activity.
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</text>
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<text>You do post to the mailing lists, don't you?</text>
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<fieldref var='activity.mailing-lists'/>
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<fieldref var='activity.xeps'/>
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</page>
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<page xmlns='http://jabber.org/protocol/xdata-layout' label='Plans and Reasonings'>
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<text>This is page three of three.</text>
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<text>You're almost done!</text>
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<text>
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This is where you describe your future plans and why you think you
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deserve to be a member of the XMPP Standards Foundation.
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</text>
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<fieldref var='future'/>
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<fieldref var='reasoning'/>
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</page>
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<field var='name.first' type='text-single' label='First Name'>
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<required/>
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</field>
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<field var='name.last' type='text-single' label='Last Name'>
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<required/>
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</field>
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<field var='email' type='text-single' label='E-mail Address'>
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<required/>
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</field>
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<field var='jid' type='jid-single' label='Jabber JID'>
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<required/>
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</field>
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<field var='background' type='text-multi' label='Background Information'>
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</field>
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<field var='future' type='text-multi' label='Jabber Plans for the Next Six Months'>
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</field>
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<field var='reasoning' type='text-multi' label='Reasons for Joining'>
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</field>
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<field var='activity.mailing-lists' type='text-multi' label='Recent Mailing List Activity'>
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</field>
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<field var='activity.xeps' type='text-multi' label='XEPs Authored or Co-Authored'>
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</field>
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</x>
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]]></example>
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<p>Note: The preceding example partitions the fields into three pages, labeled "Personal Information", "Community Activity", and "Plans and Reasonings".</p>
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</section2>
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<section2 topic='Sectioning Fields' anchor='sectioning'>
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<p>The next usage of layout is to partition pages into sections. This is done by including one or more <section/> elements within each <page/> element. Each <section/> element SHOULD possess a "label" attribute to identify the section, MAY contain a <text/> child element for additional information, and SHOULD contain a <fieldref/> element for each field to be included in the section. A <section/> element MUST contain at least one <fieldref/> element or <reportedref/> element. To reference an x:data field, the <fieldref/> element's "var" attribute MUST be the same as the intended <field/> element's "var" attribute.</p>
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<example caption='Sections of fields'><![CDATA[
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<x xmlns='jabber:x:data' type='form'>
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<title>XSF Application</title>
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<instructions>Please fill out this form</instructions>
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<page xmlns='http://jabber.org/protocol/xdata-layout'>
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<section label='Personal Information'>
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<text>
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Note: In accordance with the XSF privacy policy, your personal information will
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never be shared outside the organization in any way for any purpose; however,
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your name and JID may be published in the XSF membership directory.
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</text>
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<fieldref var='name.first'/>
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<fieldref var='name.last'/>
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<fieldref var='email'/>
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<fieldref var='jid'/>
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<fieldref var='background'/>
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</section>
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<section label='Community Activity'>
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<text>
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We use this page to gather information about any XEPs you've worked on,
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as well as your mailing list activity.
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</text>
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<text>You do post to the mailing lists, don't you?</text>
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<fieldref var='activity.mailing-lists'/>
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<fieldref var='activity.xeps'/>
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</section>
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<section label='Plans and Reasoning'>
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<text>You're almost done!</text>
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<text>
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This is where you describe your future plans and why you think you
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deserve to be a member of the XMPP Standards Foundation.
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</text>
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<fieldref var='future'/>
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<fieldref var='reasoning'/>
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</section>
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</page>
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<field var='name.first' type='text-single' label='First Name'>
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<required/>
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</field>
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<field var='name.last' type='text-single' label='Last Name'>
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<required/>
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</field>
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<field var='email' type='text-single' label='E-mail Address'>
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<required/>
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</field>
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<field var='jid' type='jid-single' label='Jabber JID'>
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<required/>
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</field>
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<field var='background' type='text-multi' label='Background Information'>
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</field>
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<field var='future' type='text-multi' label='Jabber Plans for the Next Six Months'>
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</field>
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<field var='reasoning' type='text-multi' label='Reasons for Joining'>
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</field>
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<field var='activity.mailing-lists' type='text-multi' label='Recent Mailing List Activity'>
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</field>
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<field var='activity.xeps' type='text-multi' label='XEPs Authored or Co-Authored'>
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</field>
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</x>
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]]></example>
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<p>Note: The preceding example demonstrates a layout similar to the previous example, but using three sections within one page instead of three pages.</p>
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<p>As shown in the following example, sections may be nested to produce a more granular partitioning of fields.</p>
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<example caption='Sections of fields (nested)'><![CDATA[
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<x xmlns='jabber:x:data' type='form'>
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...
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<page xmlns='http://jabber.org/protocol/xdata-layout'>
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<section label='Personal Information'>
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<text>
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Note: In accordance with the XSF privacy policy, your personal information will
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never be shared outside the organization in any way for any purpose; however,
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your name and JID may be published in the XSF membership directory.
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</text>
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<section label='Name'>
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<text>Who are you?</text>
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<fieldref var='name.first'/>
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<fieldref var='name.last'/>
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</section>
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<section label='Contact Information'>
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<text>How can we contact you?</text>
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<fieldref var='email'/>
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<fieldref var='jid'/>
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</section>
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<fieldref var='background'/>
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</section>
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<section label='Community Activity'>
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<text>
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We use this page to gather information about any XEPs you've worked on,
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as well as your mailing list activity.
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</text>
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<text>You do post to the mailing lists, don't you?</text>
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<fieldref var='activity.mailing-lists'/>
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<fieldref var='activity.xeps'/>
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</section>
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<section label='Plans and Reasoning'>
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<text>
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This is where you describe your future plans and why you think you
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deserve to be a member of the XMPP Standards Foundation.
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</text>
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<fieldref var='future'/>
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<fieldref var='reasoning'/>
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</section>
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</page>
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...
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</x>
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]]></example>
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<p>Note: The preceding example partitions the fields into one page and three sections, with the first section being further partitioned into two sub-sections and one free-standing field reference.</p>
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</section2>
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<section2 topic="Including Tables" anchor='tables'>
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<p>Data forms tables (the <reported/> and <item/> elements) can also be included in the layout, using the <reportedref/> element. This element MAY be included anywhere that the <fieldref/> element is allowed, but MUST NOT appear more than once.</p>
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<p>If a <reportedref/> element is specified when no <reported/> element is included, then the reference MUST be ignored.</p>
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</section2>
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</section1>
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<section1 topic='Business Rules' anchor='bizrules'>
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<section2 topic='Discovery' anchor='bizrules-disco'>
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<p>Form providers MAY attempt to discover if the recipient of a form supports the data forms layout protocol extension, although implementations are not required to do so. If implemented, Discovery MUST be implemened as defined in &xep0030;, using the namespace "http://jabber.org/protocol/xdata-layout" as a feature.</p>
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</section2>
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<section2 topic='Field Distribution' anchor='bizrules-distribution'>
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<p>In order to prevent the processing from becoming too complex, there are some restrictions in how fields are distributed within the layout.</p>
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<p>First, all displayable, modifiable fields (e.g. all except fields of type "FIXED" or "HIDDEN") SHOULD be referenced by a page or section. Any that are not referenced MAY remain unrendered, although implementations MAY provide some support for this. To include a "FIXED" field in the layout, it MUST possess a "var" attribute.</p>
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<p>Second, the same field SHOULD NOT be referenced by more than one page or section. Additionally, a field SHOULD NOT be referenced by the same page or section more than once.</p>
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<p>Finally, the order of layout elements SHOULD be maintained. Pages SHOULD be rendered in the order they are defined within the x:data form, and sections and fields SHOULD be rendered in the order they are defined or referenced within a page or section.</p>
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</section2>
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<section2 topic='Page Labels and Descriptions' anchor='bizrules-pages'>
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<p>The "label" attribute of the <page/> element is RECOMMENDED (although not required). If it is missing, the renderer MAY display whatever it deems appropriate (including nothing or character data of the containing form's <title/> element).</p>
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<p>The <text/> child element of the <page/> element is OPTIONAL. If it is missing, the renderer MAY display whatever it deems appropriate (including nothing or character data of the containing form's <instructions/> element).</p>
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</section2>
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<section2 topic='Section Labels and Descriptions' anchor='bizrules-sections'>
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<p>The "label" attribute of the <section/> element RECOMMENDED (but not required). If it is missing, the renderer MAY use whatever it deems appropriate (including nothing).</p>
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<p>The <text/> child element of the <section/> element is OPTIONAL. If it is missing, the renderer MAY use whatever it deems appropriate (including nothing).</p>
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</section2>
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<section2 topic='Internationalization/Localization' anchor='bizrules-i18n'>
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<p>This document relies on the internationalization/localization mechanisms provided by &xmppcore;. Specifically, labels and descriptions MUST be appropriate for the locale indicated by the containing stanza or <form/> element.</p>
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</section2>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>There are no security considerations introduced by this document.</p>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>This document requires no interaction with &IANA;.</p>
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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<section2 topic='Protocol Namespaces' anchor='registrar-ns'>
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<p>The ®ISTRAR; includes 'http://jabber.org/protocol/xdata-layout' in its registry of protocol namespaces.</p>
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</section2>
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</section1>
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<section1 topic='Formal Definition' anchor='def'>
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<section2 topic='<page/> Root Element' anchor='def-page'>
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<p>The <page/> element is the root layout element for "http://jabber.org/protocol/xdata-layout" namespace. One <page/> elements is contained within the <x xmlns='jabber:x:data'/> element for each page to be rendered. The <page/> element MAY possess an attribute that specifies a natural-language label for the page, and MAY contain child elements specifying a description, sections of the page, and field and table references.</p>
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<p>The 'label' attribute specifies the label for this page. This attribute is OPTIONAL. Its value is any string.</p>
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</section2>
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<section2 topic='<section/> Element' anchor='def-section'>
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<p>The <section/> element is used to further partition the layout within a page. The <section/> element MAY possess an attribute that specifies a natural-language label for the section, and MAY contain child elements specifying a description, subsections, and field and table references.</p>
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<p>The 'label' attribute specifies the label for this section. This attribute is OPTIONAL. Its value is any string.</p>
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</section2>
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<section2 topic='<fieldref/> Element' anchor='def-fieldref'>
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<p>The <fieldref/> element is used to situate a form field within the layout. The <fieldref/> element MUST possess a single attribute to identify the field it references, and is otherwise empty.</p>
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<p>If a <fieldref/> element within a <page/> or <section/> references a non-existent field, then that reference MUST be ignored.</p>
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<p>The 'var' attribute specifies the form field being referenced. This attribute is REQUIRED, and its value SHOULD be the same as the "var" attribute of one of the <field/> elements in the containing form.</p>
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</section2>
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<section2 topic='<reportedref/> Element' anchor='def-reportedref'>
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<p>The <reportedref/> element is used to situate a form "table" (as described by the <reported/< and <item/> elements) within the layout. The <reportedref/> element has no attributes or children.</p>
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</section2>
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<section2 topic='<text/> Element' anchor='def-text'>
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<p>The <text/> element is used to provide natural-language text that describes a page or section, provides instructions or notes about the page or section, and the like. A <page/> or <section/> element MAY contain an unbounded number of <text/> child elements. The XML character data of this element SHOULD NOT contain newlines (the \n and \r characters), and any handling of newlines (e.g., presentation in a user interface) is unspecified herein.</p>
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</section2>
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<section2 topic='XML Schema' anchor='schema'>
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<code><![CDATA[
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<?xml version='1.0' encoding='UTF-8'?>
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<xs:schema
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xmlns:xs='http://www.w3.org/2001/XMLSchema'
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targetNamespace='http://jabber.org/protocol/xdata-layout'
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xmlns='http://jabber.org/protocol/xdata-layout'
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elementFormDefault='qualified'>
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<xs:annotation>
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<xs:documentation>
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The protocol documented by this schema is defined in
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XEP-0141: http://www.xmpp.org/extensions/xep-0141.html
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</xs:documentation>
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</xs:annotation>
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<xs:element name='page'>
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<xs:complexType>
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<xs:choice minOccurs='0' maxOccurs='unbounded'>
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<xs:element ref='text' minOccurs='0' maxOccurs='unbounded'/>
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<xs:element ref='section' minOccurs='0' maxOccurs='unbounded'/>
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<xs:element ref='fieldref' minOccurs='0' maxOccurs='unbounded'/>
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<xs:element ref='reportedref' minOccurs='0' maxOccurs='unbounded'/>
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</xs:choice>
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<xs:attribute name='label' type='xs:string' use='optional'/>
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</xs:complexType>
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</xs:element>
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<xs:element name='section'>
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<xs:complexType>
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<xs:choice minOccurs='0' maxOccurs='unbounded'>
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<xs:element ref='text' minOccurs='0' maxOccurs='unbounded'/>
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<xs:element ref='section' minOccurs='0' maxOccurs='unbounded'/>
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<xs:element ref='fieldref' minOccurs='0' maxOccurs='unbounded'/>
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<xs:element ref='reportedref' minOccurs='0' maxOccurs='unbounded'/>
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</xs:choice>
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<xs:attribute name='label' type='xs:string' use='optional'/>
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</xs:complexType>
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</xs:element>
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<xs:element name='fieldref'>
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<xs:complexType>
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<xs:simpleContent>
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<xs:extension base='empty'>
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<xs:attribute name='var' type='xs:string' use='required'/>
|
|
</xs:extension>
|
|
</xs:simpleContent>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
|
|
<xs:element name='reportedref' type='empty'/>
|
|
|
|
<xs:element name='text' type='xs:string'/>
|
|
|
|
<xs:simpleType name='empty'>
|
|
<xs:restriction base='xs:string'>
|
|
<xs:enumeration value=''/>
|
|
</xs:restriction>
|
|
</xs:simpleType>
|
|
|
|
</xs:schema>
|
|
]]></code>
|
|
</section2>
|
|
</section1>
|
|
</xep>
|