Typy uzlů XML DOM
DOM představuje dokument jako hierarchii objektů uzlů.
Zkuste si to sami - příklady
Níže uvedené příklady používají soubor XML books.xml .
Typy uzlů
V následující tabulce jsou uvedeny různé typy uzlů W3C a typy uzlů, které mohou mít jako podřízené:
| Node Type | Description | Children |
|---|---|---|
| Document | Represents the entire document (the root-node of the DOM tree) | Element (max. one), ProcessingInstruction, Comment, DocumentType |
| DocumentFragment | Represents a "lightweight" Document object, which can hold a portion of a document | Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference |
| DocumentType | Provides an interface to the entities defined for the document | None |
| ProcessingInstruction | Represents a processing instruction | None |
| EntityReference | Represents an entity reference | Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference |
| Element | Represents an element | Element, Text, Comment, ProcessingInstruction, CDATASection, EntityReference |
| Attr | Represents an attribute | Text, EntityReference |
| Text | Represents textual content in an element or attribute | None |
| CDATASection | Represents a CDATA section in a document (text that will NOT be parsed by a parser) | None |
| Comment | Represents a comment | None |
| Entity | Represents an entity | Element, ProcessingInstruction, Comment, Text, CDATASection, EntityReference |
| Notation | Represents a notation declared in the DTD | None |
Typy uzlů - Návratové hodnoty
Následující tabulka uvádí, co vlastnosti nodeName a nodeValue vrátí pro každý typ uzlu:
| Node Type | nodeName returns | nodeValue returns |
|---|---|---|
| Document | #document | null |
| DocumentFragment | #document fragment | null |
| DocumentType | doctype name | null |
| EntityReference | entity reference name | null |
| Element | element name | null |
| Attr | attribute name | attribute value |
| ProcessingInstruction | target | content of node |
| Comment | #comment | comment text |
| Text | #text | content of node |
| CDATASection | #cdata-section | content of node |
| Entity | entity name | null |
| Notation | notation name | null |
NodeTypes – pojmenované konstanty
| NodeType | Named Constant |
|---|---|
| 1 | ELEMENT_NODE |
| 2 | ATTRIBUTE_NODE |
| 3 | TEXT_NODE |
| 4 | CDATA_SECTION_NODE |
| 5 | ENTITY_REFERENCE_NODE |
| 6 | ENTITY_NODE |
| 7 | PROCESSING_INSTRUCTION_NODE |
| 8 | COMMENT_NODE |
| 9 | DOCUMENT_NODE |
| 10 | DOCUMENT_TYPE_NODE |
| 11 | DOCUMENT_FRAGMENT_NODE |
| 12 | NOTATION_NODE |