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 <h2 title="Class DefaultIdentifier" class="title">Class DefaultIdentifier</h2>
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 <pre><a href="../TitleProperty.html" title="annotation in org.apache.sis.metadata">@TitleProperty</a>(<a href="../TitleProperty.html#name()">name</a>="code")
 public class <span class="typeNameLabel">DefaultIdentifier</span>
 extends <a href="ISOMetadata.html" title="class in org.apache.sis.metadata.iso">ISOMetadata</a>
 implements <a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true" title="class or interface in org.opengis.metadata" class="externalLink">Identifier</a></pre>
 <div class="block">Value uniquely identifying an object within a namespace.
  The following property is mandatory in a well-formed metadata according ISO 19115:

  <div class="preformat"><code>MD_Identifier</code>
  <code>  └─code……………</code> Alphanumeric value identifying an instance in the namespace.</div>

  One or more <code>Identifier</code> instances can be associated to some metadata objects like
  <a href="acquisition/DefaultOperation.html" title="class in org.apache.sis.metadata.iso.acquisition">operation</a>,
  <a href="acquisition/DefaultPlatform.html" title="class in org.apache.sis.metadata.iso.acquisition">platform</a>,
  <a href="acquisition/DefaultInstrument.html" title="class in org.apache.sis.metadata.iso.acquisition">instrument</a>,
  <a href="acquisition/DefaultEvent.html" title="class in org.apache.sis.metadata.iso.acquisition">event</a>,
  <a href="lineage/DefaultProcessing.html" title="class in org.apache.sis.metadata.iso.lineage">processing</a>,
  <a href="lineage/DefaultSource.html" title="class in org.apache.sis.metadata.iso.lineage">source</a>,
  <a href="content/DefaultImageDescription.html" title="class in org.apache.sis.metadata.iso.content">image description</a>,
  <a href="extent/DefaultGeographicDescription.html" title="class in org.apache.sis.metadata.iso.extent">geographic description</a>
  and more.

  <p>Referencing objects like
  <a href="../../referencing/cs/DefaultCoordinateSystemAxis.html" title="class in org.apache.sis.referencing.cs">coordinate system axis</a>,
  <a href="../../referencing/datum/DefaultGeodeticDatum.html" title="class in org.apache.sis.referencing.datum">geodetic datum</a>,
  <a href="../../referencing/crs/DefaultGeographicCRS.html" title="class in org.apache.sis.referencing.crs">geographic CRS</a> and more
  rather use the <a href="../../referencing/ImmutableIdentifier.html" title="class in org.apache.sis.referencing"><code>ImmutableIdentifier</code></a> implementation,
  which is a class unrelated to the usual <code>org.apache.metadata</code> hierarchy
  because of the immutable nature of referencing objects.</p>

  <div class="section">Text, URN and XML representations</div>
  The XML representation of <a href="DefaultIdentifier.html" title="class in org.apache.sis.metadata.iso"><code>DefaultIdentifier</code></a> is as the following example:

  <blockquote><pre>&lt;mcc:MD_Identifier
   &lt;mcc:code&gt;
     &lt;gco:CharacterString&gt;4326&lt;/gco:CharacterString&gt;
   &lt;/mcc:code&gt;
   &lt;mcc:authority&gt;
     &lt;cit:CI_Citation&gt;
       &lt;cit:title&gt;
         &lt;gco:CharacterString&gt;EPSG&lt;/gco:CharacterString&gt;
       &lt;/cit:title&gt;
     &lt;/cit:CI_Citation&gt;
   &lt;/mcc:authority&gt;
 &lt;/mcc:MD_Identifier&gt;</pre></blockquote>

  <div class="section">Limitations</div>
  <ul>
    <li>Instances of this class are not synchronized for multi-threading.
        Synchronization, if needed, is caller's responsibility.</li>
    <li>Serialized objects of this class are not guaranteed to be compatible with future Apache SIS releases.
        Serialization support is appropriate for short term storage or RMI between applications running the
        same version of Apache SIS. For long term storage, use <a href="../../xml/XML.html" title="class in org.apache.sis.xml"><code>XML</code></a> instead.</li>
  </ul></div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>0.3</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../../referencing/ImmutableIdentifier.html" title="class in org.apache.sis.referencing"><code>ImmutableIdentifier</code></a>,
 <a href="../../referencing/IdentifiedObjects.html#toURN(java.lang.Class,org.opengis.metadata.Identifier)"><code>IdentifiedObjects.toURN(Class, Identifier)</code></a>,
 <a href="../../../../../serialized-form.html#org.apache.sis.metadata.iso.DefaultIdentifier">Serialized Form</a></dd>

 <p><font size="-1">Defined in the <code>sis-metadata</code> module</font></p>
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 <h3>Fields inherited from class&nbsp;<a href="ISOMetadata.html" title="class in org.apache.sis.metadata.iso">ISOMetadata</a></h3>
 <code><a href="ISOMetadata.html#identifiers">identifiers</a></code></li>
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 <h3>Fields inherited from interface&nbsp;<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true" title="class or interface in org.opengis.metadata" class="externalLink">Identifier</a></h3>
 <code><a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true#AUTHORITY_KEY" title="class or interface in org.opengis.metadata" class="externalLink">AUTHORITY_KEY</a>, <a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true#CODE_KEY" title="class or interface in org.opengis.metadata" class="externalLink">CODE_KEY</a></code></li>
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 <tr>
 <th class="colFirst" scope="col">Constructor</th>
 <th class="colLast" scope="col">Description</th>
 </tr>
 <tr class="altColor">
 <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">DefaultIdentifier</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Construct an initially empty identifier.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.String)">DefaultIdentifier</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;code)</code></th>
 <td class="colLast">
 <div class="block">Creates an identifier initialized to the given code.</div>
 </td>
 </tr>
 <tr class="altColor">
 <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.lang.String,java.lang.String,java.lang.String)">DefaultIdentifier</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;codeSpace,
                  <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;code,
                  <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;version)</code></th>
 <td class="colLast">
 <div class="block">Creates a new identifier initialized to the given code, code space and version number.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.opengis.metadata.citation.Citation,java.lang.String)">DefaultIdentifier</a></span>&#8203;(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/citation/Citation.html?is-external=true" title="class or interface in org.opengis.metadata.citation" class="externalLink">Citation</a>&nbsp;authority,
                  <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;code)</code></th>
 <td class="colLast">
 <div class="block">Creates an identifier initialized to the given authority and code.</div>
 </td>
 </tr>
 <tr class="altColor">
 <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.opengis.metadata.Identifier)">DefaultIdentifier</a></span>&#8203;(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true" title="class or interface in org.opengis.metadata" class="externalLink">Identifier</a>&nbsp;object)</code></th>
 <td class="colLast">
 <div class="block">Constructs a new instance initialized with the values from the specified metadata object.</div>
 </td>
 </tr>
 </table>
 </li>
 </ul>
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 <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colSecond" scope="col">Method</th>
 <th class="colLast" scope="col">Description</th>
 </tr>
 <tr id="i0" class="altColor">
 <td class="colFirst"><code>static <a href="DefaultIdentifier.html" title="class in org.apache.sis.metadata.iso">DefaultIdentifier</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#castOrCopy(org.opengis.metadata.Identifier)">castOrCopy</a></span>&#8203;(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true" title="class or interface in org.opengis.metadata" class="externalLink">Identifier</a>&nbsp;object)</code></th>
 <td class="colLast">
 <div class="block">Returns a SIS metadata implementation with the values of the given arbitrary implementation.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code><a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/citation/Citation.html?is-external=true" title="class or interface in org.opengis.metadata.citation" class="externalLink">Citation</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getAuthority()">getAuthority</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Returns the person or party responsible for maintenance of the namespace.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCode()">getCode</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Returns the alphanumeric value identifying an instance in the namespace.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCodeSpace()">getCodeSpace</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Returns the identifier or namespace in which the code is valid.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code><a href="http://www.geoapi.org/3.0/javadoc/org/opengis/util/InternationalString.html?is-external=true" title="class or interface in org.opengis.util" class="externalLink">InternationalString</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getDescription()">getDescription</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Returns the natural language description of the meaning of the code value.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getVersion()">getVersion</a></span>()</code></th>
 <td class="colLast">
 <div class="block">Returns the version identifier for the namespace, as specified by the code authority.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setAuthority(org.opengis.metadata.citation.Citation)">setAuthority</a></span>&#8203;(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/citation/Citation.html?is-external=true" title="class or interface in org.opengis.metadata.citation" class="externalLink">Citation</a>&nbsp;newValue)</code></th>
 <td class="colLast">
 <div class="block">Sets the person or party responsible for maintenance of the namespace.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setCode(java.lang.String)">setCode</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;newValue)</code></th>
 <td class="colLast">
 <div class="block">Sets the alphanumeric value identifying an instance in the namespace.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setCodeSpace(java.lang.String)">setCodeSpace</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;newValue)</code></th>
 <td class="colLast">
 <div class="block">Sets the identifier or namespace in which the code is valid.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setDescription(org.opengis.util.InternationalString)">setDescription</a></span>&#8203;(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/util/InternationalString.html?is-external=true" title="class or interface in org.opengis.util" class="externalLink">InternationalString</a>&nbsp;newValue)</code></th>
 <td class="colLast">
 <div class="block">Sets the natural language description of the meaning of the code value.</div>
 </td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#setVersion(java.lang.String)">setVersion</a></span>&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;newValue)</code></th>
 <td class="colLast">
 <div class="block">Sets the version identifier for the namespace.</div>
 </td>
 </tr>
 </table>
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 <!--   -->
 </a>
 <h3>Methods inherited from class&nbsp;<a href="ISOMetadata.html" title="class in org.apache.sis.metadata.iso">ISOMetadata</a></h3>
 <code><a href="ISOMetadata.html#getIdentifier()">getIdentifier</a>, <a href="ISOMetadata.html#getIdentifierMap()">getIdentifierMap</a>, <a href="ISOMetadata.html#getIdentifiers()">getIdentifiers</a>, <a href="ISOMetadata.html#getStandard()">getStandard</a>, <a href="ISOMetadata.html#setIdentifier(org.opengis.metadata.Identifier)">setIdentifier</a>, <a href="ISOMetadata.html#transitionTo(org.apache.sis.metadata.ModifiableMetadata.State)">transitionTo</a></code></li>
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 <code><a href="../ModifiableMetadata.html#checkWritePermission()">checkWritePermission</a>, <a href="../ModifiableMetadata.html#checkWritePermission(java.lang.Object)">checkWritePermission</a>, <a href="../ModifiableMetadata.html#collectionType(java.lang.Class)">collectionType</a>, <a href="../ModifiableMetadata.html#copyCollection(java.util.Collection,java.lang.Class)">copyCollection</a>, <a href="../ModifiableMetadata.html#copyList(java.util.Collection,java.lang.Class)">copyList</a>, <a href="../ModifiableMetadata.html#copyMap(java.util.Map,java.lang.Class)">copyMap</a>, <a href="../ModifiableMetadata.html#copySet(java.util.Collection,java.lang.Class)">copySet</a>, <a href="../ModifiableMetadata.html#freeze()">freeze</a>, <a href="../ModifiableMetadata.html#isModifiable()">isModifiable</a>, <a href="../ModifiableMetadata.html#nonNullCollection(java.util.Collection,java.lang.Class)">nonNullCollection</a>, <a href="../ModifiableMetadata.html#nonNullList(java.util.List,java.lang.Class)">nonNullList</a>, <a href="../ModifiableMetadata.html#nonNullMap(java.util.Map,java.lang.Class)">nonNullMap</a>, <a href="../ModifiableMetadata.html#nonNullSet(java.util.Set,java.lang.Class)">nonNullSet</a>, <a href="../ModifiableMetadata.html#singleton(E,java.lang.Class)">singleton</a>, <a href="../ModifiableMetadata.html#state()">state</a>, <a href="../ModifiableMetadata.html#unmodifiable()">unmodifiable</a>, <a href="../ModifiableMetadata.html#writeCollection(java.util.Collection,java.util.Collection,java.lang.Class)">writeCollection</a>, <a href="../ModifiableMetadata.html#writeList(java.util.Collection,java.util.List,java.lang.Class)">writeList</a>, <a href="../ModifiableMetadata.html#writeMap(java.util.Map,java.util.Map,java.lang.Class)">writeMap</a>, <a href="../ModifiableMetadata.html#writeSet(java.util.Collection,java.util.Set,java.lang.Class)">writeSet</a></code></li>
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 <h3>Methods inherited from class&nbsp;<a href="../AbstractMetadata.html" title="class in org.apache.sis.metadata">AbstractMetadata</a></h3>
 <code><a href="../AbstractMetadata.html#asMap()">asMap</a>, <a href="../AbstractMetadata.html#asTreeTable()">asTreeTable</a>, <a href="../AbstractMetadata.html#equals(java.lang.Object)">equals</a>, <a href="../AbstractMetadata.html#equals(java.lang.Object,org.apache.sis.util.ComparisonMode)">equals</a>, <a href="../AbstractMetadata.html#getInterface()">getInterface</a>, <a href="../AbstractMetadata.html#hashCode()">hashCode</a>, <a href="../AbstractMetadata.html#isEmpty()">isEmpty</a>, <a href="../AbstractMetadata.html#prune()">prune</a>, <a href="../AbstractMetadata.html#toString()">toString</a></code></li>
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 <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink">wait</a></code></li>
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 <pre>public&nbsp;DefaultIdentifier()</pre>
 <div class="block">Construct an initially empty identifier.</div>
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 <pre>public&nbsp;DefaultIdentifier&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;code)</pre>
 <div class="block">Creates an identifier initialized to the given code.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>code</code> - the alphanumeric value identifying an instance in the namespace, or <code>null</code> if none.</dd>
 </dl>
 </li>
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 <pre>public&nbsp;DefaultIdentifier&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;codeSpace,
                          <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;code,
                          <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;version)</pre>
 <div class="block">Creates a new identifier initialized to the given code, code space and version number.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>codeSpace</code> - identifier or namespace in which the code is valid, or <code>null</code> if not available.</dd>
 <dd><code>code</code> - alphanumeric value identifying an instance in the namespace, or <code>null</code> if none.</dd>
 <dd><code>version</code> - the version identifier for the namespace as specified by the code authority, or <code>null</code> if none.</dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>1.0</dd>
 </dl>
 </li>
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 <pre>public&nbsp;DefaultIdentifier&#8203;(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/citation/Citation.html?is-external=true" title="class or interface in org.opengis.metadata.citation" class="externalLink">Citation</a>&nbsp;authority,
                          <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;code)</pre>
 <div class="block">Creates an identifier initialized to the given authority and code.
  This constructor automatically initializes the <a href="#getCodeSpace()">code space</a> to a value inferred
  from the given <code>authority</code>, if a suitable value can be found. This constructor proceeds by searching
  for the first suitable property in the following list:

  <ol>
    <li>The value of <a href="../../xml/IdentifierSpace.html#getName()"><code>IdentifierSpace.getName()</code></a>.</li>
    <li>A <a href="citation/DefaultCitation.html#getIdentifiers()">citation identifier</a>
        which is a valid
        <a href="../../util/CharSequences.html#isUnicodeIdentifier(java.lang.CharSequence)">unicode identifier</a>.</li>
    <li>Only if the citation has no identifier, a citation title or
        <a href="citation/DefaultCitation.html#getAlternateTitles()">alternate title</a>
        which is a valid
        <a href="../../util/CharSequences.html#isUnicodeIdentifier(java.lang.CharSequence)">unicode identifier</a>.</li>
  </ol></div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>authority</code> - the the person or party responsible for maintenance of the namespace, or <code>null</code> if none.</dd>
 <dd><code>code</code> - the alphanumeric value identifying an instance in the namespace, or <code>null</code> if none.</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="citation/Citations.html#toCodeSpace(org.opengis.metadata.citation.Citation)"><code>Citations.toCodeSpace(Citation)</code></a></dd>
 </dl>
 </li>
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 <pre>public&nbsp;DefaultIdentifier&#8203;(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true" title="class or interface in org.opengis.metadata" class="externalLink">Identifier</a>&nbsp;object)</pre>
 <div class="block">Constructs a new instance initialized with the values from the specified metadata object.
  This is a <cite>shallow</cite> copy constructor, since the other metadata contained in the
  given object are not recursively copied.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>object</code> - the metadata to copy values from, or <code>null</code> if none.</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="#castOrCopy(org.opengis.metadata.Identifier)"><code>castOrCopy(Identifier)</code></a></dd>
 </dl>
 </li>
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 <pre class="methodSignature">public static&nbsp;<a href="DefaultIdentifier.html" title="class in org.apache.sis.metadata.iso">DefaultIdentifier</a>&nbsp;castOrCopy&#8203;(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true" title="class or interface in org.opengis.metadata" class="externalLink">Identifier</a>&nbsp;object)</pre>
 <div class="block">Returns a SIS metadata implementation with the values of the given arbitrary implementation.
  This method performs the first applicable action in the following choices:

  <ul>
    <li>If the given object is <code>null</code>, then this method returns <code>null</code>.</li>
    <li>Otherwise if the given object is already an instance of
        <code>DefaultIdentifier</code>, then it is returned unchanged.</li>
    <li>Otherwise a new <code>DefaultIdentifier</code> instance is created using the
        <a href="#%3Cinit%3E(org.opengis.metadata.Identifier)">copy constructor</a>
        and returned. Note that this is a <cite>shallow</cite> copy operation, since the other
        metadata contained in the given object are not recursively copied.</li>
  </ul></div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>object</code> - the object to get as a SIS implementation, or <code>null</code> if none.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>a SIS implementation containing the values of the given object (may be the
          given object itself), or <code>null</code> if the argument was null.</dd>
 </dl>
 </li>
 </ul>
 <a id="getAuthority()">
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 <h4>getAuthority</h4>
 <pre class="methodSignature">public&nbsp;<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/citation/Citation.html?is-external=true" title="class or interface in org.opengis.metadata.citation" class="externalLink">Citation</a>&nbsp;getAuthority()</pre>
 <div class="block">Returns the person or party responsible for maintenance of the namespace.
  The organization's abbreviation is often the same than this identifier
  <a href="#getCodeSpace()">code space</a>, but not necessarily.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true#getAuthority()" title="class or interface in org.opengis.metadata" class="externalLink">getAuthority</a></code>&nbsp;in interface&nbsp;<code><a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true" title="class or interface in org.opengis.metadata" class="externalLink">Identifier</a></code></dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>person or party responsible for maintenance of the namespace, or <code>null</code> if not available.</dd>
 </dl>
 </li>
 </ul>
 <a id="setAuthority(org.opengis.metadata.citation.Citation)">
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 <pre class="methodSignature">public&nbsp;void&nbsp;setAuthority&#8203;(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/citation/Citation.html?is-external=true" title="class or interface in org.opengis.metadata.citation" class="externalLink">Citation</a>&nbsp;newValue)</pre>
 <div class="block">Sets the person or party responsible for maintenance of the namespace.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>newValue</code> - the new authority.</dd>
 </dl>
 </li>
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 <pre class="methodSignature">public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;getCode()</pre>
 <div class="block">Returns the alphanumeric value identifying an instance in the namespace.
  The code is optionally from a controlled list or pattern.

  <div class="note"><b>Example:</b> <code>"4326"</code>.</div>

  The code is mandatory according ISO specification, but this <code>DefaultIdentifier</code>
  implementation does not enforce this restriction.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true#getCode()" title="class or interface in org.opengis.metadata" class="externalLink">getCode</a></code>&nbsp;in interface&nbsp;<code><a href="http://www.geoapi.org/3.0/javadoc/org/opengis/metadata/Identifier.html?is-external=true" title="class or interface in org.opengis.metadata" class="externalLink">Identifier</a></code></dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>value identifying an instance in the namespace.</dd>
 </dl>
 </li>
 </ul>
 <a id="setCode(java.lang.String)">
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 <h4>setCode</h4>
 <pre class="methodSignature">public&nbsp;void&nbsp;setCode&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;newValue)</pre>
 <div class="block">Sets the alphanumeric value identifying an instance in the namespace.
  Should avoid characters that are not legal in URLs.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>newValue</code> - the new code, or <code>null</code>.</dd>
 </dl>
 </li>
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 <pre class="methodSignature"><a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true" title="class or interface in org.opengis.annotation" class="externalLink">@UML</a>(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true#identifier()" title="class or interface in org.opengis.annotation" class="externalLink">identifier</a>="codeSpace",
      <a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true#obligation()" title="class or interface in org.opengis.annotation" class="externalLink">obligation</a>=<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/Obligation.html?is-external=true#OPTIONAL" title="class or interface in org.opengis.annotation" class="externalLink">OPTIONAL</a>,
      <a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true#specification()" title="class or interface in org.opengis.annotation" class="externalLink">specification</a>=<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/Specification.html?is-external=true#ISO_19115" title="class or interface in org.opengis.annotation" class="externalLink">ISO_19115</a>)
 public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;getCodeSpace()</pre>
 <div class="block">Returns the identifier or namespace in which the code is valid.
  This is often the <a href="#getAuthority()">authority</a>'s abbreviation, but not necessarily.

  <div class="note"><b>Example:</b> <code>"EPSG"</code>.</div></div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the identifier or namespace in which the code is valid, or <code>null</code> if none.</dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>0.5</dd>
 </dl>
 </li>
 </ul>
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 <pre class="methodSignature">public&nbsp;void&nbsp;setCodeSpace&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;newValue)</pre>
 <div class="block">Sets the identifier or namespace in which the code is valid.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>newValue</code> - the new code space, or <code>null</code> if none.</dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>0.5</dd>
 </dl>
 </li>
 </ul>
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 <pre class="methodSignature"><a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true" title="class or interface in org.opengis.annotation" class="externalLink">@UML</a>(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true#identifier()" title="class or interface in org.opengis.annotation" class="externalLink">identifier</a>="version",
      <a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true#obligation()" title="class or interface in org.opengis.annotation" class="externalLink">obligation</a>=<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/Obligation.html?is-external=true#OPTIONAL" title="class or interface in org.opengis.annotation" class="externalLink">OPTIONAL</a>,
      <a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true#specification()" title="class or interface in org.opengis.annotation" class="externalLink">specification</a>=<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/Specification.html?is-external=true#ISO_19115" title="class or interface in org.opengis.annotation" class="externalLink">ISO_19115</a>)
 public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;getVersion()</pre>
 <div class="block">Returns the version identifier for the namespace, as specified by the code authority.
  This version is included only when the <a href="#getCode()">code</a> uses versions.
  When appropriate, the edition is identified by the effective date, coded using ISO 8601 date format.

  <div class="note"><b>Example:</b> the version of the underlying EPSG database.</div></div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the version identifier for the namespace, or <code>null</code> if none.</dd>
 </dl>
 </li>
 </ul>
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 <pre class="methodSignature">public&nbsp;void&nbsp;setVersion&#8203;(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;newValue)</pre>
 <div class="block">Sets the version identifier for the namespace.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>newValue</code> - the new version, or <code>null</code> if none.</dd>
 </dl>
 </li>
 </ul>
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 <h4>getDescription</h4>
 <pre class="methodSignature"><a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true" title="class or interface in org.opengis.annotation" class="externalLink">@UML</a>(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true#identifier()" title="class or interface in org.opengis.annotation" class="externalLink">identifier</a>="description",
      <a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true#obligation()" title="class or interface in org.opengis.annotation" class="externalLink">obligation</a>=<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/Obligation.html?is-external=true#OPTIONAL" title="class or interface in org.opengis.annotation" class="externalLink">OPTIONAL</a>,
      <a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/UML.html?is-external=true#specification()" title="class or interface in org.opengis.annotation" class="externalLink">specification</a>=<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/annotation/Specification.html?is-external=true#ISO_19115" title="class or interface in org.opengis.annotation" class="externalLink">ISO_19115</a>)
 public&nbsp;<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/util/InternationalString.html?is-external=true" title="class or interface in org.opengis.util" class="externalLink">InternationalString</a>&nbsp;getDescription()</pre>
 <div class="block">Returns the natural language description of the meaning of the code value.

  <div class="note"><b>Example:</b> "World Geodetic System 1984".</div></div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>the natural language description, or <code>null</code> if none.</dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>0.5</dd>
 </dl>
 </li>
 </ul>
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 <h4>setDescription</h4>
 <pre class="methodSignature">public&nbsp;void&nbsp;setDescription&#8203;(<a href="http://www.geoapi.org/3.0/javadoc/org/opengis/util/InternationalString.html?is-external=true" title="class or interface in org.opengis.util" class="externalLink">InternationalString</a>&nbsp;newValue)</pre>
 <div class="block">Sets the natural language description of the meaning of the code value.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>newValue</code> - the new natural language description, or <code>null</code> if none.</dd>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>0.5</dd>
 </dl>
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