Describe the properties of the different XML objects
The nodes and their properties can be accessed and modified.
A XML Document has two properties: root and url
root: the root element of the document, it is a XML Element;
url: the url, as a string, of the document if it exist or an empty string if it is undefined.
doc = xmlReadStr("<root><a att=""foo"" rib=""bar""><b>Hello</b></a></root>"); doc.root = doc.root.children(1); xmlDump(doc) doc.url = TMPDIR+"/foo.xml"; doc xmlWrite(doc); xmlDelete(doc); | ![]() | ![]() |
A XML Element has seven properties:
name: the tag name;
namespace: a XML Namespace object;
content: the node content as a string. For example, the content of the node A in <A>hello <B>world</B> will be the string "hello world";
type: the type of the node as a string. It can be on of the following values: "XML_ELEMENT_NODE", "XML_ATTRIBUTE_NODE", "XML_TEXT_NODE", "XML_CDATA_SECTION_NODE", "XML_ENTITY_REF_NODE", "XML_ENTITY_NODE", "XML_PI_NODE", "XML_COMMENT_NODE", "XML_DOCUMENT_NODE", "XML_DOCUMENT_TYPE_NODE", "XML_DOCUMENT_FRAG_NODE", "XML_NOTATION_NODE", "XML_HTML_DOCUMENT_NODE", "XML_DTD_NODE", "XML_ELEMENT_DECL", "XML_ATTRIBUTE_DECL", "XML_ENTITY_DECL", "XML_NAMESPACE_DECL", "XML_XINCLUDE_START", "XML_XINCLUDE_END", "XML_DOCB_DOCUMENT_NODE".
parent: the parent XML Element;
attributes: the node attributes as a XML Attributes object;
children: the children elements as a XML Node List object.
line: the line definition of this XML Element.
s = "<root xmlns:bar=""http://www.scilab.org/"">"+.. "<bar:a att=""foo"" rib=""bar"">"+.. "<b>Hello</b><c> world</c></bar:a></root>" doc = xmlReadStr(s); first = doc.root.children(1); b = first.children(1); // Add a new attribute named "new_attribute" first.attributes.new_attribute = "value"; // Display the first child namespace first.namespace // Display the node content first.content // b has a parent b.parent // You can add a new child to first first.children(3) = b // non-integer index can be used to make insertion first.children(1.5) = "<d> Scilab</d>" // First child has been defined at line... b.line xmlDump(first) xmlDelete(doc); | ![]() | ![]() |
A XML Attributes is a kind of hashtable which maps attributes name to attributes value. An attribute value can be accessed or modified in using the attribute name as field of this object or in using an index between 1 and attributes size.
s = "<root xmlns:bar=""http://www.scilab.org/"">"+.. "<bar:a att=""foo"" rib=""bar"">"+.. "<b>Hello</b><c> world</c></bar:a></root>" doc = xmlReadStr(s); first = doc.root.children(1); // Read an attribute first.attributes.att // Set an empty attribute first.attributes.att = ""; // Add a new attribute first.attributes.hello = "world"; // Use an index first.attributes(1) = "Bonjour"; first.attributes(1) xmlDump(first) xmlDelete(doc); | ![]() | ![]() |
A XML Namespace has two properties: href and prefix
href: the namespace href as a string;
prefix: the prefix to use for this namespace, as a string.
s = "<root xmlns:bar=""http://www.scilab.org/"">"+.. "<bar:a att=""foo"" rib=""bar"">"+.. "<b>Hello</b><c> world</c></bar:a></root>" doc = xmlReadStr(s); ns = doc.root.children(1).namespace; ns.href ns.prefix xmlDelete(doc); | ![]() | ![]() |
A XML Node List is a type used to enumerate the children of an element. Each element can be accessed with an integer index. Since this is a list, it is possible to make insertion of new element in it, in using double index.
The size of the list can be retrieved in using 'size' field.
The name or the contents of each node of the list can be retrieved in using 'name' or 'content' field.
doc = xmlReadStr("<root><a>Hello</a><b> world</b></root>"); c = doc.root.children; // We check that we have two elements c.size // Read the first element xmlDump(c(1)) // Replace an element by another one c(1) = "<c>Hello</c>" // Insert a new element between the first and the second c(1.5) = "<d> Scilab</d>" // 1.5 or 1.234... // Insert a new element at the tail or at the head of the list c(0) = "<e>Head </e>" c(217) = "<f> Tail</f>" xmlDump(c) // Get the nodes name c.name // Get the nodes contents c.content xmlDelete(doc); | ![]() | ![]() |
A XML Node Set is an object returned by a XPath query. It is not possible to insert new elements or to replace existing ones. It is just possible to get them in using an integer index.
The size of the set can be retrieved with field 'size'.
doc = xmlReadStr("<root><a><b>Hello</b></a><a>World</a></root>"); s = xmlXPath(doc, "//a") s.size s(1).content s(2).content // Or ... s.content xmlDelete(doc); | ![]() | ![]() |
A XML Validation file is an object used to validate a document. It is possible to validate in using DTD, Relax NG or schema.
doc = xmlRead("SCI/modules/xml/tests/unit_tests/library.xml"); dtd = xmlDTD("SCI/modules/xml/tests/unit_tests/library.dtd"); schema = xmlSchema("SCI/modules/xml/tests/unit_tests/library.xsd"); rng = xmlRelaxNG("SCI/modules/xml/tests/unit_tests/library.rng"); // Validation xmlValidate(doc, dtd); xmlValidate(doc, rng); xmlValidate(doc, schema); xmlDelete("all"); | ![]() | ![]() |
Version | Description |
5.4.0 | XML module introduced. |