**Inheritance:**
java.lang.Object

**All Implemented Interfaces:**
java.lang.Iterable
```
public class CustomXmlPartCollection implements Iterable
```

Represents a collection of Custom XML Parts. The items are [CustomXmlPart](../../com.aspose.words/customxmlpart/) objects.

To learn more, visit the [ Structured Document Tags or Content Control ][Structured Document Tags or Content Control] documentation article.

 **Remarks:** 

You do not normally need to create instances of this class. You can access custom XML data stored in a document via the [Document.getCustomXmlParts()](../../com.aspose.words/document/\#getCustomXmlParts) / [Document.setCustomXmlParts(com.aspose.words.CustomXmlPartCollection)](../../com.aspose.words/document/\#setCustomXmlParts-com.aspose.words.CustomXmlPartCollection) property.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```


[Structured Document Tags or Content Control]: https://docs.aspose.com/words/java/working-with-content-control-sdt/
## Methods

| Method | Description |
| --- | --- |
| [add(CustomXmlPart part)](#add-com.aspose.words.CustomXmlPart) | Adds an item to the collection. |
| [add(String id, String xml)](#add-java.lang.String-java.lang.String) | Creates a new XML part with the specified XML and adds it to the collection. |
| [clear()](#clear) | Removes all elements from the collection. |
| [deepClone()](#deepClone) | Makes a deep copy of this collection and its items. |
| [get(int index)](#get-int) | Gets an item at the specified index. |
| [getById(String id)](#getById-java.lang.String) | Finds and returns a custom XML part by its identifier. |
| [getCount()](#getCount) | Gets the number of elements contained in the collection. |
| [iterator()](#iterator) | Returns an iterator object that can be used to iterate over all items in the collection. |
| [removeAt(int index)](#removeAt-int) | Removes an item at the specified index. |
| [set(int index, CustomXmlPart value)](#set-int-com.aspose.words.CustomXmlPart) | Sets an item at the specified index. |
### add(CustomXmlPart part) {#add-com.aspose.words.CustomXmlPart}
```
public void add(CustomXmlPart part)
```


Adds an item to the collection.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| part | [CustomXmlPart](../../com.aspose.words/customxmlpart/) | The custom XML part to add. |

### add(String id, String xml) {#add-java.lang.String-java.lang.String}
```
public CustomXmlPart add(String id, String xml)
```


Creates a new XML part with the specified XML and adds it to the collection.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| id | java.lang.String | Identifier of a new custom XML part. |
| xml | java.lang.String | XML data of the part. |

**Returns:**
[CustomXmlPart](../../com.aspose.words/customxmlpart/) - Created custom XML part.
### clear() {#clear}
```
public void clear()
```


Removes all elements from the collection.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```

### deepClone() {#deepClone}
```
public CustomXmlPartCollection deepClone()
```


Makes a deep copy of this collection and its items.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```

**Returns:**
[CustomXmlPartCollection](../../com.aspose.words/customxmlpartcollection/)
### get(int index) {#get-int}
```
public CustomXmlPart get(int index)
```


Gets an item at the specified index.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| index | int | Zero-based index of the item. |

**Returns:**
[CustomXmlPart](../../com.aspose.words/customxmlpart/) - An item at the specified index.
### getById(String id) {#getById-java.lang.String}
```
public CustomXmlPart getById(String id)
```


Finds and returns a custom XML part by its identifier.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| id | java.lang.String | Case-sensitive string that identifies the custom XML part. |

**Returns:**
[CustomXmlPart](../../com.aspose.words/customxmlpart/) - Returns  null  if a custom XML part with the specified identifier is not found.
### getCount() {#getCount}
```
public int getCount()
```


Gets the number of elements contained in the collection.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```

**Returns:**
int - The number of elements contained in the collection.
### iterator() {#iterator}
```
public Iterator iterator()
```


Returns an iterator object that can be used to iterate over all items in the collection.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```

**Returns:**
java.util.Iterator
### removeAt(int index) {#removeAt-int}
```
public void removeAt(int index)
```


Removes an item at the specified index.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| index | int | The zero based index. |

### set(int index, CustomXmlPart value) {#set-int-com.aspose.words.CustomXmlPart}
```
public void set(int index, CustomXmlPart value)
```


Sets an item at the specified index.

 **Examples:** 

Shows how to create a structured document tag with custom XML data.

```

 Document doc = new Document();

 // Construct an XML part that contains data and add it to the document's collection.
 // If we enable the "Developer" tab in Microsoft Word,
 // we can find elements from this collection in the "XML Mapping Pane", along with a few default elements.
 String xmlPartId = UUID.randomUUID().toString();
 String xmlPartContent = "Hello, World!";
 CustomXmlPart xmlPart = doc.getCustomXmlParts().add(xmlPartId, xmlPartContent);

 Assert.assertEquals(xmlPart.getData(), xmlPartContent.getBytes());
 Assert.assertEquals(xmlPart.getId(), xmlPartId);

 // Below are two ways to refer to XML parts.
 // 1 -  By an index in the custom XML part collection:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().get(0));

 // 2 -  By GUID:
 Assert.assertEquals(xmlPart, doc.getCustomXmlParts().getById(xmlPartId));

 // Add an XML schema association.
 xmlPart.getSchemas().add("http://www.w3.org/2001/XMLSchema");

 // Clone a part, and then insert it into the collection.
 CustomXmlPart xmlPartClone = xmlPart.deepClone();
 xmlPartClone.setId(UUID.randomUUID().toString());
 doc.getCustomXmlParts().add(xmlPartClone);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 2);

 // Iterate through the collection and print the contents of each part.
 Iterator enumerator = doc.getCustomXmlParts().iterator();
 int index = 0;
 while (enumerator.hasNext()) {
     CustomXmlPart customXmlPart = enumerator.next();
     System.out.println(MessageFormat.format("XML part index {0}, ID: {1}", index, customXmlPart.getId()));
     System.out.println(MessageFormat.format("\tContent: {0}", customXmlPart.getData()));
     index++;
 }

 // Use the "RemoveAt" method to remove the cloned part by index.
 doc.getCustomXmlParts().removeAt(1);

 Assert.assertEquals(doc.getCustomXmlParts().getCount(), 1);

 // Clone the XML parts collection, and then use the "Clear" method to remove all its elements at once.
 CustomXmlPartCollection customXmlParts = doc.getCustomXmlParts().deepClone();
 customXmlParts.clear();

 // Create a structured document tag that will display our part's contents and insert it into the document body.
 StructuredDocumentTag tag = new StructuredDocumentTag(doc, SdtType.PLAIN_TEXT, MarkupLevel.BLOCK);
 tag.getXmlMapping().setMapping(xmlPart, "/root[1]/text[1]", "");

 doc.getFirstSection().getBody().appendChild(tag);

 doc.save(getArtifactsDir() + "StructuredDocumentTag.CustomXml.docx");
 
```

**Parameters:**
| Parameter | Type | Description |
| --- | --- | --- |
| index | int | Zero-based index of the item. |
| value | [CustomXmlPart](../../com.aspose.words/customxmlpart/) | An item at the specified index. |