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---
title: Definitions
---
The definitions below are an essential part of the parser.
## Node Types
The type of a node is determined during parsing and represented by one of the elements in the list below.
| Type | Description
| ---- | -----------
| `HDOM_TYPE_ELEMENT` | Start tag (i.e. `<html>`)
| `HDOM_TYPE_COMMENT` | HTML comment (i.e. `<!-- Hello, World! -->`)
| `HDOM_TYPE_TEXT` | Plain text (i.e. `Hello, World!`)
| `HDOM_TYPE_ROOT` | Root element. There can always only be one root element in the DOM.
| `HDOM_TYPE_UNKNOWN` | Unknown type (i.e. CDATA, DOCTYPE, etc...)
### Example
```html
<!DOCTYPE html><html><!-- Hello, World! --></html>Hello, World!
```
_Note_: `HDOM_TYPE_ROOT` always exists regardless of the actual document structure.
| HTML | Node Type
| ---- | ---------
| | `HDOM_TYPE_ROOT`
| `<!DOCTYPE html>` | `HDOM_TYPE_UNKNOWN`
| `<html>` | `HDOM_TYPE_ELEMENT`
| `<!-- Hello, World! -->` | `HDOM_TYPE_COMMENT`
| `Hello, World!` | `HDOM_TYPE_TEXT`
## Quote Types
Identifies the quoting type on attribute values.
| Type | Description
| ---- | -----------
| `HDOM_QUOTE_DOUBLE` | Double quotes (`""`)
| `HDOM_QUOTE_SINGLE` | Single quotes (`''`)
| `HDOM_QUOTE_NO` | Not quoted (flag)
_Note_: Attributes with no values (flags) are stored as `HDOM_QUOTE_NO`.
### Example
```html
<p class="paragraph" id='info1' hidden>Hello, World!</p>
```
| Attribute | Description
| --------- | -----------
| `class="paragraph"` | `HDOM_QUOTE_DOUBLE`
| `id='info1'` | `HDOM_QUOTE_SINGLE`
| `hidden` | `HDOM_QUOTE_NO`
## Node Info Types
Each node stores additional information (metadata) that is identified by the elements below.
| Type | Description
| ---- | -----------
| `HDOM_INFO_BEGIN` | Cursor position for the start tag of a node.
| `HDOM_INFO_END` | Cursor position for the end tag of a node. A value of zero indicates a node with no end tag (missing closing tag).
| `HDOM_INFO_QUOTE` | Quote type for attribute values. The value must be an element of [Quote Type](#quote-types).
| `HDOM_INFO_SPACE` | Array of whitespace around attributes (see [Attribute Whitespace](#attribute-whitespace)).
| `HDOM_INFO_TEXT` | Non-HTML text in tags (i.e. comments, doctype, etc...).
| `HDOM_INFO_INNER` | Inner text of a node.
| `HDOM_INFO_OUTER` | Outer text of a node.
| `HDOM_INFO_ENDSPACE` | Whitespace at the end of a tag before the closing bracket.
## Attribute Whitespace
Whitespace around attributes is stored in the form of an array with three elements:
| Element | Description
| ------- | -----------
| `0` | Whitespace before the attribute name.
| `1` | Whitespace between attribute name and the equal sign.
| `2` | Whitespace between the equal sign and the attribute value
### Example
```html
<p class="paragraph" id = 'info1'hidden>Hello, World!</p>
```
_Note_: Whitespace before attribute names is not displayed in the browser. It is, however, part of the attributes.
| Attribute | Description
| --------- | -----------
| ` class="paragraph"` | `[0] => ' ', [1] => '', [2] => ''`
| ` id = 'info1'` | `[0] => ' ', [1] => ' ', [2] => ' '`
| `hidden` | `[0] => '', [1] => '', [2] => ''`
|