### Rust XML DOM Complete Example - Building an XHTML Document

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Provides a complete example of building a valid XHTML 1.0 Strict document using the `xml_dom` crate. It demonstrates creating document type, document element, head, title, body, h1, and p elements with text content.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

fn main() {
    let implementation = get_implementation();

    // Create document type
    let doctype = implementation
        .create_document_type(
            "html",
            Some("-//W3C//DTD XHTML 1.0 Strict//EN"),
            Some("http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"),
        )
        .unwrap();

    // Create document
    let mut document_node = implementation
        .create_document(
            Some("http://www.w3.org/1999/xhtml"),
            Some("html"),
            Some(doctype),
        )
        .unwrap();

    let document = as_document_mut(&mut document_node).unwrap();
    let mut root = document.document_element().unwrap();
    let root_elem = as_element_mut(&mut root).unwrap();
    root_elem.set_attribute("lang", "en").unwrap();

    // Create head section
    let mut head = document.create_element("head").unwrap();
    let mut title = document.create_element("title").unwrap();
    title.append_child(document.create_text_node("My Page")).unwrap();
    head.append_child(title).unwrap();
    root.append_child(head).unwrap();

    // Create body section
    let mut body = document.create_element("body").unwrap();
    let mut h1 = document.create_element("h1").unwrap();
    h1.append_child(document.create_text_node("Welcome")).unwrap();
    body.append_child(h1).unwrap();

    let mut p = document.create_element("p").unwrap();
    p.append_child(document.create_text_node("Hello, World!")).unwrap();
    body.append_child(p).unwrap();

    root.append_child(body).unwrap();

    println!("{}", document_node);
}
```

--------------------------------

### Get DOM Implementation in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Retrieves a reference to a DOMImplementation instance, essential for bootstrapping DOM operations. This function is part of the level2 module and allows checking feature support for 'Core' and 'XML'.

```rust
use xml_dom::level2::get_implementation;

let implementation = get_implementation();

// Check feature support
assert!(implementation.has_feature("Core", "2.0"));
assert!(implementation.has_feature("XML", "1.0"));
```

--------------------------------

### Manipulate XML Node Tree in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Provides examples of modifying the XML document tree structure using `Node::append_child`, `insert_before`, and `remove_child`. These methods allow for dynamic construction and modification of XML documents. The `xml_dom::level2` and `xml_dom::level2::convert` modules are required.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(None, Some("list"), None)
    .unwrap();

let document = as_document_mut(&mut document_node).unwrap();
let mut root = document.document_element().unwrap();

// Append children
let item1 = document.create_element("item").unwrap();
let item2 = document.create_element("item").unwrap();
let item3 = document.create_element("item").unwrap();

root.append_child(item1).unwrap();
root.append_child(item3.clone()).unwrap();

// Insert before existing child
root.insert_before(item2, Some(item3.clone())).unwrap();

// Remove a child
root.remove_child(item3).unwrap();

println!("{}", document_node);
// Output: <list><item></item><item></item></list>
```

--------------------------------

### Parse XML from Reader using parser::read_reader

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Parses XML data from any type that implements `std::io::BufRead`, enabling streaming input from files or other sources. This is memory-efficient for large XML documents. Examples include parsing from a file or a string buffer.

```rust
use xml_dom::parser::read_reader;
use std::io::BufReader;
use std::fs::File;

// Parse from a file
let file = File::open("document.xml").expect("File not found");
let reader = BufReader::new(file);
let document = read_reader(reader).expect("Failed to parse XML");

// Or from a string via cursor
use std::io::Cursor;
let xml_data = "<root><child/></root>";
let cursor = Cursor::new(xml_data);
let document = read_reader(cursor).expect("Failed to parse XML");
```

--------------------------------

### Create Processing Instructions in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Demonstrates creating processing instruction nodes, such as XML stylesheets, using `Document::create_processing_instruction`. These instructions provide information to applications processing the XML document. The `xml_dom::level2` and `xml_dom::level2::convert` modules are necessary.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(None, Some("root"), None)
    .unwrap();

let document = as_document_mut(&mut document_node).unwrap();

// Create processing instruction
let pi = document
    .create_processing_instruction(
        "xml-stylesheet",
        Some("type=\"text/xsl\" href=\"style.xsl\" "),
    )
    .unwrap();
document_node.append_child(pi).unwrap();

println!("{}", document_node);
```

--------------------------------

### Create and Manipulate XML Document using xml_dom in Rust

Source: https://github.com/johnstonskj/rust-xml_dom/blob/main/README.md

Demonstrates creating a new HTML document, setting attributes, appending elements, and converting the DOM to an XML string using the xml_dom crate. It requires the `level2` and `level2::convert` modules.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

// Bootstrap; get an instance of `DOMImplementation`.
let implementation = get_implementation();

// Create a `DocumentType` instance.
let document_type = implementation
    .create_document_type(
        "html",
        Some("-//W3C//DTD XHTML 1.0 Transitional//EN"),
        Some("http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"),
    )
    .unwrap();

// Create a new `Document` using the document type defined above.
let mut document_node = implementation
    .create_document(
        Some("http://www.w3.org/1999/xhtml"),
        Some("html"),
        Some(document_type))
    .unwrap();

// Cast the returned document `RefNode` into a `RefDocument` trait reference
let document = as_document_mut(&mut document_node).unwrap();

// Fetch the document's root element as a node, then cast to `RefElement`.
let mut root_node = document.document_element().unwrap();
let root = as_element_mut(&mut root_node).unwrap();

// Create an `Attribute` instance on the root element.
root.set_attribute("lang", "en");

// Create two child `Element`s of "html".
let _head = root.append_child(document.create_element("head").unwrap());
let _body = root.append_child(document.create_element("body").unwrap());

// Display as XML.
let xml = document_node.to_string();
println!("document 2: {}", xml);
```

--------------------------------

### Create XML Document with Root Element in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Demonstrates creating a new XML document using the DOMImplementation. This method allows specifying a namespace URI, a qualified name for the root element, and an optional document type.

```rust
use xml_dom::level2::*;

let implementation = get_implementation();

// Create a simple document with root element "html" in XHTML namespace
let document_node = implementation
    .create_document(
        Some("http://www.w3.org/1999/xhtml"),
        Some("html"),
        None,
    )
    .unwrap();

println!("{}", document_node);
// Output: <html xmlns="http://www.w3.org/1999/xhtml"></html>
```

--------------------------------

### Configure Document Behavior with ProcessingOptions

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Allows configuration of document creation behavior using the `ProcessingOptions` struct. Options like `set_assume_ids()` and `set_add_namespaces()` can be set to modify how the DOM handles attributes and namespaces during document creation. This requires using `get_implementation_ext`.

```rust
use xml_dom::level2::*;
use xml_dom::level2::ext::*;
use xml_dom::level2::ext::dom_impl::get_implementation_ext;

// Create options
let mut options = ProcessingOptions::new();
options.set_assume_ids();      // Treat 'id' attributes as XML IDs
options.set_add_namespaces();  // Auto-add namespace declarations

// Create document with options
let implementation = get_implementation_ext();
let document = implementation
    .create_document_with_options(
        Some("http://example.org/ns"),
        Some("root"),
        None,
        options,
    )
    .unwrap();
```

--------------------------------

### Create Namespaced Elements in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Demonstrates the creation of XML elements that belong to a specific namespace. This involves providing both the namespace URI and the qualified name of the element when calling `create_element_ns`.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(
        Some("http://www.w3.org/2000/svg"),
        Some("svg"),
        None,
    )
    .unwrap();

let document = as_document_mut(&mut document_node).unwrap();
let mut root = document.document_element().unwrap();

// Create a namespaced element
let rect = document
    .create_element_ns("http://www.w3.org/2000/svg", "svg:rect")
    .unwrap();
root.append_child(rect).unwrap();

println!("{}", document_node);

```

--------------------------------

### Create CDATA Sections in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Explains how to create CDATA sections using `Document::create_cdata_section`. This is useful for including content that should not be parsed as markup, such as script tags. The `xml_dom::level2` and `xml_dom::level2::convert` modules are required.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(None, Some("script"), None)
    .unwrap();

let document = as_document_mut(&mut document_node).unwrap();
let mut root = document.document_element().unwrap();

// Create CDATA section with markup content
let cdata = document
    .create_cdata_section("<markup>is allowed here</markup>")
    .unwrap();
root.append_child(cdata).unwrap();

println!("{}", document_node);
// Output: <script><![CDATA[<markup>is allowed here</markup>]]></script>
```

--------------------------------

### Set Element Attributes in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Demonstrates how to set attribute values on an XML element by name using `Element::set_attribute`. It also shows how to check for attribute existence and retrieve attribute values. This requires the `xml_dom::level2` and `xml_dom::level2::convert` modules.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(None, Some("html"), None)
    .unwrap();

let document = as_document_mut(&mut document_node).unwrap();
let mut root_node = document.document_element().unwrap();
let root = as_element_mut(&mut root_node).unwrap();

// Set attributes
root.set_attribute("lang", "en").unwrap();
root.set_attribute("class", "container").unwrap();

// Check attribute exists
assert!(root.has_attribute("lang"));
assert_eq!(root.get_attribute("lang"), Some("en".to_string()));

println!("{}", document_node);
// Output: <html lang="en" class="container"></html>
```

--------------------------------

### Create Element Nodes in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Shows how to create new element nodes within a document. These elements can then be appended as children to other nodes in the document tree. Requires mutable access to the document and its elements.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(None, Some("root"), None)
    .unwrap();

let document = as_document_mut(&mut document_node).unwrap();
let mut root_node = document.document_element().unwrap();

// Create child elements
let head = document.create_element("head").unwrap();
let body = document.create_element("body").unwrap();

// Append to root
root_node.append_child(head).unwrap();
root_node.append_child(body).unwrap();

println!("{}", document_node);
// Output: <root><head></head><body></body></root>
```

--------------------------------

### Create Comment Nodes in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Demonstrates the creation of XML comment nodes using `Document::create_comment`. The comment node is then appended to the root element of the document. This functionality relies on the `xml_dom::level2` and `xml_dom::level2::convert` modules.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(None, Some("root"), None)
    .unwrap();

let document = as_document_mut(&mut document_node).unwrap();
let mut root = document.document_element().unwrap();

// Create comment node
let comment = document.create_comment(" This is a comment ");
root.append_child(comment).unwrap();

println!("{}", document_node);
// Output: <root><!-- This is a comment --></root>
```

--------------------------------

### Create Text Nodes in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Shows how to create text nodes for element content using `Document::create_text_node`. The created text node is then appended as a child to a root element. This function requires the `xml_dom::level2` and `xml_dom::level2::convert` modules.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(None, Some("message"), None)
    .unwrap();

let document = as_document_mut(&mut document_node).unwrap();
let mut root = document.document_element().unwrap();

// Create and append text content
let text = document.create_text_node("Hello, World!");
root.append_child(text).unwrap();

println!("{}", document_node);
// Output: <message>Hello, World!</message>
```

--------------------------------

### Rust XML DOM Error Handling for Node Appending

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Demonstrates error handling when attempting to append a node from a different document using the `xml_dom` crate. It specifically catches `Error::WrongDocument` and `Error::HierarchyRequest` exceptions.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut doc1 = implementation
    .create_document(None, Some("doc1"), None)
    .unwrap();
let doc2 = implementation
    .create_document(None, Some("doc2"), None)
    .unwrap();

let document1 = as_document_mut(&mut doc1).unwrap();
let document2 = as_document(&doc2).unwrap();

// Try to append element from different document
let foreign_element = document2.document_element().unwrap();
let mut root1 = document1.document_element().unwrap();

match root1.append_child(foreign_element) {
    Ok(_) => println!("Added successfully"),
    Err(Error::WrongDocument) => println!("Cannot add node from different document"),
    Err(Error::HierarchyRequest) => println!("Invalid hierarchy"),
    Err(e) => println!("Other error: {}", e),
}
```

--------------------------------

### Parse XML String to DOM using parser::read_xml

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Parses an XML string directly into a Document Object Model (DOM) structure. This function requires the `quick_parser` feature to be enabled. It handles various XML constructs including comments and CDATA sections.

```rust
use xml_dom::parser::read_xml;

let xml = r###"<?xml version="1.0"?>
<root>
    <item id="1">First</item>
    <item id="2">Second</item>
    <!-- A comment -->
    <![CDATA[Some <special> content]]>
</root>"###;

let document = read_xml(xml).expect("Failed to parse XML");
println!("{:#?}", document);
println!("{}", document);
```

--------------------------------

### Create Document Type Declaration in Rust

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Illustrates creating a DocumentType node, which is used for DTD declarations. This includes specifying the node name, public identifier, and system identifier. The created DocumentType can then be used when creating a new document.

```rust
use xml_dom::level2::*;

let implementation = get_implementation();

// Create an XHTML document type
let document_type = implementation
    .create_document_type(
        "html",
        Some("-//W3C//DTD XHTML 1.0 Transitional//EN"),
        Some("http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"),
    )
    .unwrap();

// Use document type when creating a document
let document_node = implementation
    .create_document(
        Some("http://www.w3.org/1999/xhtml"),
        Some("html"),
        Some(document_type),
    )
    .unwrap();

println!("{}", document_node);
// Output: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" SYSTEM "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"></html>
```

--------------------------------

### Parse XML String to RefNode using xml_dom in Rust

Source: https://github.com/johnstonskj/rust-xml_dom/blob/main/README.md

Provides a function to parse an XML string into a `RefNode` representing the Document object. This functionality is part of the `quick_parser` feature, which is enabled by default. It returns a `Result` containing the `RefNode` or an error.

```rust
pub fn read_xml(xml: AsRef<str>) -> Result<RefNode>;
```

--------------------------------

### Safe Node Casting with Type Conversion Functions

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Provides safe casting functions within the `convert` module for converting between different DOM node types (e.g., Document, Element). These functions include type checking (`is_document`, `is_element`) and safe casting (`as_document`, `as_element`), returning `Result` to handle potential type mismatches gracefully. Mutable casting is also supported.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(None, Some("root"), None)
    .unwrap();

// Type checking
assert!(is_document(&document_node));
assert!(!is_element(&document_node));

// Safe casting to Document
let document = as_document(&document_node).unwrap();
let root_node = document.document_element().unwrap();

// Safe casting to Element (returns Result)
assert!(is_element(&root_node));
let element = as_element(&root_node).unwrap();
println!("Tag name: {}", element.tag_name());

// Mutable casting
let mut document_node = implementation
    .create_document(None, Some("root"), None)
    .unwrap();
let document = as_document_mut(&mut document_node).unwrap();
let mut root_node = document.document_element().unwrap();
let root = as_element_mut(&mut root_node).unwrap();
root.set_attribute("modified", "true").unwrap();
```

--------------------------------

### Find Elements by Tag Name using Document::get_elements_by_tag_name

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Returns a collection of all descendant elements that match a given tag name. Using '*' as the tag name will return all elements in the document. This is useful for iterating over elements of a specific type.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(None, Some("root"), None)
    .unwrap();

let document = as_document_mut(&mut document_node).unwrap();
let mut root = document.document_element().unwrap();

// Build structure
let mut parent = document.create_element("parent").unwrap();
let child1 = document.create_element("child").unwrap();
let child2 = document.create_element("child").unwrap();
parent.append_child(child1).unwrap();
parent.append_child(child2).unwrap();
root.append_child(parent).unwrap();

// Find all "child" elements
let children = document.get_elements_by_tag_name("child");
assert_eq!(children.len(), 2);

// Use "*" to match all elements
let all_elements = document.get_elements_by_tag_name("*");
assert_eq!(all_elements.len(), 3); // parent + 2 children
```

--------------------------------

### Find Element by ID using Document::get_element_by_id

Source: https://context7.com/johnstonskj/rust-xml_dom/llms.txt

Retrieves a single element from the DOM by its 'xml:id' attribute. This method is efficient for direct element access when IDs are unique. It requires the element to have an 'xml:id' attribute set.

```rust
use xml_dom::level2::*;
use xml_dom::level2::convert::*;

let implementation = get_implementation();
let mut document_node = implementation
    .create_document(None, Some("root"), None)
    .unwrap();

let document = as_document_mut(&mut document_node).unwrap();
let mut root = document.document_element().unwrap();

// Create element with xml:id
let mut item = document.create_element("item").unwrap();
let id_attr = document
    .create_attribute_ns("http://www.w3.org/XML/1998/namespace", "xml:id")
    .unwrap();
item.set_attribute_node(id_attr).unwrap();
as_element_mut(&mut item)
    .unwrap()
    .set_attribute_ns(
        "http://www.w3.org/XML/1998/namespace",
        "xml:id",
        "my-item",
    )
    .unwrap();
root.append_child(item).unwrap();

// Find by ID
let found = document.get_element_by_id("my-item");
assert!(found.is_some());
```

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