Read XML document and return Document Object Model node
DOMnode = xmlread(filename)
reads
the specified XML file and returns a Document Object Model node representing
the document.DOMnode
= xmlread(filename
)
|
File name, specified as a character vector or string scalar containing the name of the local file or URL. |
|
Document Object Model node, as defined by the World Wide Web consortium. For more information, see What Is an XML Document Object Model (DOM)?. |
The root element in an XML file sometimes includes an xsi:noNamespaceSchemaLocation
attribute.
The value of this attribute is the name of the preferred schema file.
Call the getAttribute
method to get this value:
xDoc = xmlread(fullfile(matlabroot,'toolbox',... 'matlab','general','info.xml')); xRoot = xDoc.getDocumentElement; schema = char(xRoot.getAttribute('xsi:noNamespaceSchemaLocation'))
This code returns:
schema = https://www.mathworks.com/namespace/info/v1/info.xsd
Create functions that parse data from an XML file into a MATLAB® structure
array with fields Name
, Attributes
, Data
,
and Children
:
function theStruct = parseXML(filename) % PARSEXML Convert XML file to a MATLAB structure. try tree = xmlread(filename); catch error('Failed to read XML file %s.',filename); end % Recurse over child nodes. This could run into problems % with very deeply nested trees. try theStruct = parseChildNodes(tree); catch error('Unable to parse XML file %s.',filename); end % ----- Local function PARSECHILDNODES ----- function children = parseChildNodes(theNode) % Recurse over node children. children = []; if theNode.hasChildNodes childNodes = theNode.getChildNodes; numChildNodes = childNodes.getLength; allocCell = cell(1, numChildNodes); children = struct( ... 'Name', allocCell, 'Attributes', allocCell, ... 'Data', allocCell, 'Children', allocCell); for count = 1:numChildNodes theChild = childNodes.item(count-1); children(count) = makeStructFromNode(theChild); end end % ----- Local function MAKESTRUCTFROMNODE ----- function nodeStruct = makeStructFromNode(theNode) % Create structure of node info. nodeStruct = struct( ... 'Name', char(theNode.getNodeName), ... 'Attributes', parseAttributes(theNode), ... 'Data', '', ... 'Children', parseChildNodes(theNode)); if any(strcmp(methods(theNode), 'getData')) nodeStruct.Data = char(theNode.getData); else nodeStruct.Data = ''; end % ----- Local function PARSEATTRIBUTES ----- function attributes = parseAttributes(theNode) % Create attributes structure. attributes = []; if theNode.hasAttributes theAttributes = theNode.getAttributes; numAttributes = theAttributes.getLength; allocCell = cell(1, numAttributes); attributes = struct('Name', allocCell, 'Value', ... allocCell); for count = 1:numAttributes attrib = theAttributes.item(count-1); attributes(count).Name = char(attrib.getName); attributes(count).Value = char(attrib.getValue); end end
The display for a properly parsed document is [#document:
null]
. For example,
xDoc = xmlread('info.xml')
xDoc = [#document: null]