XmlElement::find() - Code Metrics - Inspection of "New way of checking if TLS is available" - kadet1090/nucleus - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 3cecaa...777c1d )

by Kacper

created 2016-08-03 11:07 UTC

XmlElement::find() A

↳ Parent: XmlElement::get()

Complexity

Conditions	3
Paths	3

Size

Total Lines	10
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	5
CRAP Score	3

Importance

Changes

Metric	Value
cc	3
eloc	5
nc	3
nop	1
dl	0
loc	10
ccs	5
cts	5
cp	1
crap	3
rs	9.4285
c	0
b	0
f	0

<?php
/**
 * XMPP Library
 *
 * Copyright (C) 2016, Some right reserved.
 *
 * @author Kacper "Kadet" Donat <[email protected]>
 *
 * Contact with author:
 * Xmpp: [email protected]
 * E-mail: [email protected]
 *
 * From Kadet with love.
 */

namespace Kadet\Xmpp\Xml;

use Kadet\Xmpp\Exception\InvalidArgumentException;
use Kadet\Xmpp\Utils\Accessors;
use Kadet\Xmpp\Utils\filter;
use Kadet\Xmpp\Utils\helper;

/**
 * Class XmlElement
 * @package Kadet\Xmpp\Xml
 *
 * @property string          $localName  Tag name without prefix
 * @property string          $namespace  XML Namespace URI
 * @property string          $prefix     Tag prefix
 * @property string          $name       Full tag name prefix:local-name
 *
 * @property XmlElement|null $parent     Element's parent or null if root node.
 * @property XmlElement[]    $children   All element's child nodes
 *
 * @property array           $attributes Element's attributes, without xmlns definitions
 * @property array           $namespaces Element's namespaces
 *
 * @property string          $innerXml   Inner XML content
 */
class XmlElement
{
    use Accessors;

    /**
     * Settings for tiding up XML output
     *
     * @var array
     */
    public static $tidy = [
        'indent' => true,
        'input-xml' => true,
        'output-xml' => true,
        'drop-empty-paras' => false,
        'wrap' => 0
    ];

    /** @var string */
    private $_localName;
    /** @var null|string|false */
    private $_prefix = null;

    /** @var array */
    private $_namespaces = [];
    /** @var array */
    private $_attributes = [];

    /**
     * @var XmlElement
     */
    private $_parent;

    /**
     * @var XmlElement[]
     */
    private $_children = [];

    /**
     * Initializes element with given name and URI
     *
     * @param string $name Element name, including prefix if needed
     * @param string $uri  Namespace URI of element
     */
    protected function init(string $name, string $uri = null)
    {
        list($name, $prefix) = self::resolve($name);

        $this->_localName = $name;
        $this->_prefix = $prefix;

        if ($uri !== null) {
            $this->namespace = $uri;
        }
    }

    /**
     * XmlElement constructor
     *
     * @param string $name Element name, including prefix if needed
     * @param string $uri  Namespace URI of element
     */
    public function __construct(string $name, string $uri = null)
    {
        $this->init($name, $uri);
    }

    /**
     * Elements named constructor, same for every subclass.
     * It's used for factory creation.
     *
     * @param string $name Element name, including prefix if needed
     * @param string $uri  Namespace URI of element
     *
     * @return XmlElement
     */
    public static function plain(string $name, string $uri = null)
    {
        /** @var XmlElement $element */
        $element = (new \ReflectionClass(static::class))->newInstanceWithoutConstructor();
        $element->init($name, $uri);

        return $element;
    }

    /**
     * @see $innerXml
     * @return string
     */
    public function getInnerXml()
    {
        return implode('', array_map(function ($element) {
            if (is_string($element)) {
                return htmlspecialchars($element);
            } elseif ($element instanceof XmlElement) {
                return $element->xml(false);
            }

            return (string)$element;
        }, $this->_children));
    }

    /**
     * Returns XML representation of element
     *
     * @param bool $clean Result will be cleaned if set to true
     *
     * @return string
     */
    public function xml(bool $clean = true): string
    {
        if ($this->namespace && $this->_prefix === null) {
            $this->_prefix = $this->lookupPrefix($this->namespace);
        }

        $attributes = $this->attributes();

        $result = "<{$this->name}";
        $result .= ' ' . implode(' ', array_map(function ($key, $value) {
                return $key . '="' . htmlspecialchars($value, ENT_QUOTES) . '"';
            }, array_keys($attributes), array_values($attributes)));

        if (!empty($this->_children)) {
            $result .= ">{$this->innerXml}</{$this->name}>";
        } else {
            $result .= "/>";
        }

        return $clean && function_exists('tidy_repair_string') ? tidy_repair_string($result, self::$tidy) : $result;
    }

    /**
     * Looks up prefix associated with given URI
     *
     * @param string|null $uri
     * @return string|false
     */
    public function lookupPrefix(string $uri = null)
    {
        return $this->getNamespaces()[$uri] ?? false;
    }

    /**
     * Looks up URI associated with given prefix
     *
     * @param string|null $prefix
     * @return string|false
     */
    public function lookupUri(string $prefix = null)
    {
        return array_search($prefix, $this->getNamespaces()) ?: false;
    }

    /**
     * Returns element's namespaces
     *
     * @param bool $parent Include namespaces from parent?
     * @return array
     */
    public function getNamespaces($parent = true): array
    {
        if (!$this->_parent) {
            return $this->_namespaces;
        }

        if ($parent) {
            return array_merge($this->_namespaces, $this->_parent->getNamespaces());
        } else {
            return array_diff_assoc($this->_namespaces, $this->_parent->getNamespaces());
        }
    }

    /**
     * Sets XML attribute of element
     *
     * @param string      $attribute Attribute name, optionally with prefix
     * @param mixed       $value     Attribute value
     * @param string|null $uri       XML Namespace URI of attribute, prefix will be automatically looked up
     */
    public function setAttribute(string $attribute, $value, string $uri = null)
    {
        $this->_attributes[$this->_prefix($attribute, $uri)] = $value;
    }

    /**
     * Returns value of specified attribute.
     *
     * @param string      $attribute Attribute name, optionally with prefix
     * @param string|null $uri       XML Namespace URI of attribute, prefix will be automatically looked up
     * @return bool|mixed
     */
    public function getAttribute(string $attribute, string $uri = null)
    {
        return $this->_attributes[$this->_prefix($attribute, $uri)] ?? false;
    }

    /**
     * Checks if attribute exists
     *
     * @param string      $attribute Attribute name, optionally with prefix
     * @param string|null $uri       XML Namespace URI of attribute, prefix will be automatically looked up
     *
     * @return bool
     */
    public function hasAttribute(string $attribute, string $uri = null)
    {
        return isset($this->_attributes[$this->_prefix($attribute, $uri)]);
    }

    /**
     * Returns element's parent
     * @return XmlElement|null
     */
    public function getParent()
    {
        return $this->_parent;
    }

    /**
     * Sets element's parent
     * @param XmlElement $parent
     */
    protected function setParent(XmlElement $parent)
    {
        if (!$this->_prefix && ($prefix = $parent->lookupPrefix($this->namespace)) !== false) {
            $this->_namespaces[$this->namespace] = $prefix;
            $this->_prefix = $prefix;
        }

        $this->_parent = $parent;
        if ($this->namespace === false) {
            $this->namespace = $parent->namespace;
        }
    }

    /**
     * Appends child to element
     *
     * @param XmlElement|string $element
     *
     * @return XmlElement|string Same as $element
     */
    public function append($element)
    {
        if (!is_string($element) && !$element instanceof XmlElement) {
            throw new InvalidArgumentException(helper\format('$element should be either string or object of {class} class, {type} given', [
                'class' => XmlElement::class,
                'type' => helper\typeof($element)
            ]));
        }

        if ($element instanceof XmlElement) {
            $element->parent = $this;
        }

        return $this->_children[] = $element;
    }

    /**
     * Returns namespace URI associated with element
     *
     * @return false|string
     */
    public function getNamespace()
    {
        return $this->lookupUri($this->prefix);
    }

    /**
     * Adds namespace to element, and associates it with prefix.
     *
     * @param string           $uri    Namespace URI
     * @param string|bool|null $prefix Prefix which will be used for namespace, false for using element's prefix
     *                                 and null for no prefix
     */
    public function setNamespace(string $uri, $prefix = false)
    {
        if ($prefix === false) {
            $prefix = $this->_prefix;
        }

        $this->_namespaces[$uri] = $prefix;
    }

    public function getName()
    {
        return ($this->_prefix ? $this->prefix . ':' : null) . $this->localName;
    }

    public function getChildren()
    {
        return $this->_children;
    }

    public function getPrefix()
    {
        return $this->_prefix;
    }

    public function getLocalName()
    {
        return $this->_localName;
    }

    public function getAttributes()
    {
        return $this->_attributes;
    }

    /**
     * Returns one element at specified index (for default the first one).
     *
     * @param string $name  Requested element tag name
     * @param string $uri   Requested element namespace
     * @param int    $index Index of element to retrieve
     *
     * @return XmlElement|false Retrieved element
     */
    public function element(string $name, string $uri = null, int $index = 0)
    {
        return array_values($this->elements($name, $uri))[$index] ?? false;
    }

    /**
     * Retrieves array of matching elements
     *
     * @param string      $name Requested element tag name
     * @param string|null $uri  Requested element namespace
     *
     * @return XmlElement[] Found Elements
     */
    public function elements($name, $uri = null) : array
    {
        $predicate = filter\tag($name);
        if ($uri !== null) {
            $predicate = filter\all($predicate, filter\xmlns($uri));
        }

        return $this->all($predicate);
    }

    /**
     * Filters element with given predicate
     *
     * @param callable|string $predicate Predicate or class name
     *
     * @return XmlElement[]
     */
    public function all($predicate)
    {
        return array_values(array_filter($this->_children, filter\predicate($predicate)));
    }

    /**
     * Iterates over matching elements
     *
     * @param callable|string $predicate Predicate or class name
     *
     * @return XmlElement|false
     */
    public function get($predicate)
    {
        $predicate = filter\predicate($predicate);
        foreach ($this->_children as $index => $child) {
            if($predicate($child)) {
                return $child;
            }
        }

        return false;
    }

    /**
     * @param string|null $query
     * @return XPathQuery
     */
    public function query(string $query = null)
    {
        return new XPathQuery($query, $this);
    }

    /**
     * Helper for retrieving all arguments (including namespaces)
     *
     * @return array
     */
    private function attributes(): array
    {
        $namespaces = $this->getNamespaces(false);
        $namespaces = array_map(function ($prefix, $uri) {
            return [$prefix ? "xmlns:{$prefix}" : 'xmlns', $uri];
        }, array_values($namespaces), array_keys($namespaces));

        return array_merge(
            $this->_attributes,
            array_combine(array_column($namespaces, 0), array_column($namespaces, 1))
        );
    }

    /**
     * Prefixes $name with attribute associated with $uri
     *
     * @param string $name Name to prefix
     * @param string $uri  Namespace URI
     *
     * @return string
     */
    protected function _prefix(string $name, string $uri = null): string
    {
        if($uri === null) {
            return $name;
        }

        if (($prefix = $this->lookupPrefix($uri)) === false) {
            throw new InvalidArgumentException(helper\format('URI "{uri}" is not a registered namespace', ['uri' => $uri]));
        }

        return "{$prefix}:{$name}";
    }

    public function __toString()
    {
        return trim($this->xml(true));
    }

    /**
     * Splits name into local-name and prefix
     *
     * @param $name
     * @return array [$name, $prefix]
     */
    public static function resolve($name)
    {
        $prefix = null;
        if (($pos = strpos($name, ':')) !== false) {
            $prefix = substr($name, 0, $pos);
            $name = substr($name, $pos + 1);
        }

        return [$name, $prefix];
    }
}


1		<?php
2		/**
3		* XMPP Library
4		*
5		* Copyright (C) 2016, Some right reserved.
6		*
7		* @author Kacper "Kadet" Donat <[email protected]>
8		*
9		* Contact with author:
10		* Xmpp: [email protected]
11		* E-mail: [email protected]
12		*
13		* From Kadet with love.
14		*/
15
16		namespace Kadet\Xmpp\Xml;
17
18		use Kadet\Xmpp\Exception\InvalidArgumentException;
19		use Kadet\Xmpp\Utils\Accessors;
20		use Kadet\Xmpp\Utils\filter;
21		use Kadet\Xmpp\Utils\helper;
22
23		/**
24		* Class XmlElement
25		* @package Kadet\Xmpp\Xml
26		*
27		* @property string $localName Tag name without prefix
28		* @property string $namespace XML Namespace URI
29		* @property string $prefix Tag prefix
30		* @property string $name Full tag name prefix:local-name
31		*
32		* @property XmlElement\|null $parent Element's parent or null if root node.
33		* @property XmlElement[] $children All element's child nodes
34		*
35		* @property array $attributes Element's attributes, without xmlns definitions
36		* @property array $namespaces Element's namespaces
37		*
38		* @property string $innerXml Inner XML content
39		*/
40		class XmlElement
41		{
42		use Accessors;
43
44		/**
45		* Settings for tiding up XML output
46		*
47		* @var array
48		*/
49		public static $tidy = [
50		'indent' => true,
51		'input-xml' => true,
52		'output-xml' => true,
53		'drop-empty-paras' => false,
54		'wrap' => 0
55		];
56
57		/** @var string */
58		private $_localName;
59		/** @var null\|string\|false */
60		private $_prefix = null;
61
62		/** @var array */
63		private $_namespaces = [];
64		/** @var array */
65		private $_attributes = [];
66
67		/**
68		* @var XmlElement
69		*/
70		private $_parent;
71
72		/**
73		* @var XmlElement[]
74		*/
75		private $_children = [];
76
77		/**
78		* Initializes element with given name and URI
79		*
80		* @param string $name Element name, including prefix if needed
81		* @param string $uri Namespace URI of element
82		*/
83	19	protected function init(string $name, string $uri = null)
84		{
85	19	list($name, $prefix) = self::resolve($name);
86
87	19	$this->_localName = $name;
88	19	$this->_prefix = $prefix;
89
90	19	if ($uri !== null) {
91	9	$this->namespace = $uri;
92		}
93	19	}
94
95		/**
96		* XmlElement constructor
97		*
98		* @param string $name Element name, including prefix if needed
99		* @param string $uri Namespace URI of element
100		*/
101	15	public function __construct(string $name, string $uri = null)
102		{
103	15	$this->init($name, $uri);
104	15	}
105
106		/**
107		* Elements named constructor, same for every subclass.
108		* It's used for factory creation.
109		*
110		* @param string $name Element name, including prefix if needed
111		* @param string $uri Namespace URI of element
112		*
113		* @return XmlElement
114		*/
115	4	public static function plain(string $name, string $uri = null)
116		{
117		/** @var XmlElement $element */
118	4	$element = (new \ReflectionClass(static::class))->newInstanceWithoutConstructor();
119	4	$element->init($name, $uri);
120
121	4	return $element;
122		}
123
124		/**
125		* @see $innerXml
126		* @return string
127		*/
128	2	public function getInnerXml()
129		{
130		return implode('', array_map(function ($element) {
131	2	if (is_string($element)) {
132	1	return htmlspecialchars($element);
133		} elseif ($element instanceof XmlElement) {
134	1	return $element->xml(false);
135		}
136
137		return (string)$element;
138	2	}, $this->_children));
139		}
140
141		/**
142		* Returns XML representation of element
143		*
144		* @param bool $clean Result will be cleaned if set to true
145		*
146		* @return string
147		*/
148	2	public function xml(bool $clean = true): string
149		{
150	2	if ($this->namespace && $this->_prefix === null) {
151	1	$this->_prefix = $this->lookupPrefix($this->namespace);
152		}
153
154	2	$attributes = $this->attributes();
155
156	2	$result = "<{$this->name}";
157		$result .= ' ' . implode(' ', array_map(function ($key, $value) {
158	1	return $key . '="' . htmlspecialchars($value, ENT_QUOTES) . '"';
159	2	}, array_keys($attributes), array_values($attributes)));
160
161	2	if (!empty($this->_children)) {
162	1	$result .= ">{$this->innerXml}</{$this->name}>";
163		} else {
164	2	$result .= "/>";
165		}
166
167	2	return $clean && function_exists('tidy_repair_string') ? tidy_repair_string($result, self::$tidy) : $result;
168		}
169
170		/**
171		* Looks up prefix associated with given URI
172		*
173		* @param string\|null $uri
174		* @return string\|false
175		*/
176	10	public function lookupPrefix(string $uri = null)
177		{
178	10	return $this->getNamespaces()[$uri] ?? false;
179		}
180
181		/**
182		* Looks up URI associated with given prefix
183		*
184		* @param string\|null $prefix
185		* @return string\|false
186		*/
187	14	public function lookupUri(string $prefix = null)
188		{
189	14	return array_search($prefix, $this->getNamespaces()) ?: false;
190		}
191
192		/**
193		* Returns element's namespaces
194		*
195		* @param bool $parent Include namespaces from parent?
196		* @return array
197		*/
198	16	public function getNamespaces($parent = true): array
199		{
200	16	if (!$this->_parent) {
201	16	return $this->_namespaces;
202		}
203
204	9	if ($parent) {
205	9	return array_merge($this->_namespaces, $this->_parent->getNamespaces());
206		} else {
207	1	return array_diff_assoc($this->_namespaces, $this->_parent->getNamespaces());
208		}
209		}
210
211		/**
212		* Sets XML attribute of element
213		*
214		* @param string $attribute Attribute name, optionally with prefix
215		* @param mixed $value Attribute value
216		* @param string\|null $uri XML Namespace URI of attribute, prefix will be automatically looked up
217		*/
218	4	public function setAttribute(string $attribute, $value, string $uri = null)
219		{
220	4	$this->_attributes[$this->_prefix($attribute, $uri)] = $value;
221	3	}
222
223		/**
224		* Returns value of specified attribute.
225		*
226		* @param string $attribute Attribute name, optionally with prefix
227		* @param string\|null $uri XML Namespace URI of attribute, prefix will be automatically looked up
228		* @return bool\|mixed
229		*/
230	2	public function getAttribute(string $attribute, string $uri = null)
231		{
232	2	return $this->_attributes[$this->_prefix($attribute, $uri)] ?? false;
233		}
234
235		/**
236		* Checks if attribute exists
237		*
238		* @param string $attribute Attribute name, optionally with prefix
239		* @param string\|null $uri XML Namespace URI of attribute, prefix will be automatically looked up
240		*
241		* @return bool
242		*/
243	2	public function hasAttribute(string $attribute, string $uri = null)
244		{
245	2	return isset($this->_attributes[$this->_prefix($attribute, $uri)]);
246		}
247
248		/**
249		* Returns element's parent
250		* @return XmlElement\|null
251		*/
252	1	public function getParent()
253		{
254	1	return $this->_parent;
255		}
256
257		/**
258		* Sets element's parent
259		* @param XmlElement $parent
260		*/
261	9	protected function setParent(XmlElement $parent)
262		{
263	9	if (!$this->_prefix && ($prefix = $parent->lookupPrefix($this->namespace)) !== false) {
264	1	$this->_namespaces[$this->namespace] = $prefix;
265	1	$this->_prefix = $prefix;
266		}
267
268	9	$this->_parent = $parent;
269	9	if ($this->namespace === false) {
270	4	$this->namespace = $parent->namespace;
271		}
272	9	}
273
274		/**
275		* Appends child to element
276		*
277		* @param XmlElement\|string $element
278		*
279		* @return XmlElement\|string Same as $element
280		*/
281	11	public function append($element)
282		{
283	11	if (!is_string($element) && !$element instanceof XmlElement) {
284	1	throw new InvalidArgumentException(helper\format('$element should be either string or object of {class} class, {type} given', [
285	1	'class' => XmlElement::class,
286	1	'type' => helper\typeof($element)
287		]));
288		}
289
290	10	if ($element instanceof XmlElement) {
291	9	$element->parent = $this;
292		}
293
294	10	return $this->_children[] = $element;
295		}
296
297		/**
298		* Returns namespace URI associated with element
299		*
300		* @return false\|string
301		*/
302	14	public function getNamespace()
303		{
304	14	return $this->lookupUri($this->prefix);
305		}
306
307		/**
308		* Adds namespace to element, and associates it with prefix.
309		*
310		* @param string $uri Namespace URI
311		* @param string\|bool\|null $prefix Prefix which will be used for namespace, false for using element's prefix
312		* and null for no prefix
313		*/
314	13	public function setNamespace(string $uri, $prefix = false)
315		{
316	13	if ($prefix === false) {
317	11	$prefix = $this->_prefix;
318		}
319
320	13	$this->_namespaces[$uri] = $prefix;
321	13	}
322
323	6	public function getName()
324		{
325	6	return ($this->_prefix ? $this->prefix . ':' : null) . $this->localName;
326		}
327
328	5	public function getChildren()
329		{
330	5	return $this->_children;
331		}
332
333	14	public function getPrefix()
334		{
335	14	return $this->_prefix;
336		}
337
338	9	public function getLocalName()
339		{
340	9	return $this->_localName;
341		}
342
343	6	public function getAttributes()
344		{
345	6	return $this->_attributes;
346		}
347
348		/**
349		* Returns one element at specified index (for default the first one).
350		*
351		* @param string $name Requested element tag name
352		* @param string $uri Requested element namespace
353		* @param int $index Index of element to retrieve
354		*
355		* @return XmlElement\|false Retrieved element
356		*/
357	1	public function element(string $name, string $uri = null, int $index = 0)
358		{
359	1	return array_values($this->elements($name, $uri))[$index] ?? false;
360		}
361
362		/**
363		* Retrieves array of matching elements
364		*
365		* @param string $name Requested element tag name
366		* @param string\|null $uri Requested element namespace
367		*
368		* @return XmlElement[] Found Elements
369		*/
370	2	public function elements($name, $uri = null) : array
371		{
372	2	$predicate = filter\tag($name);
373	2	if ($uri !== null) {
374	1	$predicate = filter\all($predicate, filter\xmlns($uri));
375		}
376
377	2	return $this->all($predicate);
378		}
379
380		/**
381		* Filters element with given predicate
382		*
383		* @param callable\|string $predicate Predicate or class name
384		*
385		* @return XmlElement[]
386		*/
387	2	public function all($predicate)
388		{
389	2	return array_values(array_filter($this->_children, filter\predicate($predicate)));
390		}
391
392		/**
393		* Iterates over matching elements
394		*
395		* @param callable\|string $predicate Predicate or class name
396		*
397		* @return XmlElement\|false
398		*/
399	1	public function get($predicate)
400		{
401	1	$predicate = filter\predicate($predicate);
402	1	foreach ($this->_children as $index => $child) {
403	1	if($predicate($child)) {
404		return $child;
405		}
406		}
407	1
408		return false;
409		}
410
411		/**
412		* @param string\|null $query
413		* @return XPathQuery
414	1	*/
415		public function query(string $query = null)
416	1	{
417		return new XPathQuery($query, $this);
418		}
419
420		/**
421		* Helper for retrieving all arguments (including namespaces)
422		*
423		* @return array
424	2	*/
425		private function attributes(): array
426	2	{
427	2	$namespaces = $this->getNamespaces(false);
428	1	$namespaces = array_map(function ($prefix, $uri) {
429	2	return [$prefix ? "xmlns:{$prefix}" : 'xmlns', $uri];
430		}, array_values($namespaces), array_keys($namespaces));
431	2
432	2	return array_merge(
433	2	$this->_attributes,
434		array_combine(array_column($namespaces, 0), array_column($namespaces, 1))
435		);
436		}
437
438		/**
439		* Prefixes $name with attribute associated with $uri
440		*
441		* @param string $name Name to prefix
442		* @param string $uri Namespace URI
443		*
444		* @return string
445	4	*/
446		protected function _prefix(string $name, string $uri = null): string
447	4	{
448	3	if($uri === null) {
449		return $name;
450		}
451	3
452	1	if (($prefix = $this->lookupPrefix($uri)) === false) {
453		throw new InvalidArgumentException(helper\format('URI "{uri}" is not a registered namespace', ['uri' => $uri]));
454		}
455	2
456		return "{$prefix}:{$name}";
457		}
458	1
459		public function __toString()
460	1	{
461		return trim($this->xml(true));
462		}
463
464		/**
465		* Splits name into local-name and prefix
466		*
467		* @param $name
468		* @return array [$name, $prefix]
469	19	*/
470		public static function resolve($name)
471	19	{
472	19	$prefix = null;
473	2	if (($pos = strpos($name, ':')) !== false) {
474	2	$prefix = substr($name, 0, $pos);
475		$name = substr($name, $pos + 1);
476		}
477	19
478		return [$name, $prefix];
479		}
480		}
481

kadet1090 / nucleus

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XmlElement::find() A

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