This function takes an XML data string ( xml_data) or a file path orįile-like object ( from_file) as input, converts it to the canonicalįorm, and writes it out using the out file(-like) object, if provided, The main restrictions regard the placement of namespaceĭeclarations, the ordering of attributes, and ignorable whitespace. That XML serializers have and instead generates a more constrained XML canonicalize ( xml_data = None, *, out = None, from_file = None, ** options ) ¶Ĭanonicalization is a way to normalise XML output in a way that allowsīyte-by-byte comparisons and digital signatures. Predicates (expressions within square brackets) must be preceded by a tag (for the last position), or a position relative to (1 is the first position), the expression last() Selects all elements that are located at the given The sub-tree below it (its children, their children, and so on). Finding interesting elements ¶Įlement has some useful methods that help iterate recursively over all It can be useful when you’re reading a large XML documentĪnd don’t want to hold it wholly in memory. If you don’t mind your application blocking on reading XMLĭata but would still like to have incremental parsing capabilities, take a lookĪt iterparse(). In such cases, blocking reads are unacceptable.īecause it’s so flexible, XMLPullParser can be inconvenient to use for Where the XML data is being received from a socket or read incrementally from The obvious use case is applications that operate in a non-blocking fashion feed ( ' more text' ) > for event, elem in parser. To get the parsed XMLĮlements, call XMLPullParser.read_events(). Incrementally with XMLPullParser.feed() calls. Require a blocking read to obtain the XML data, and is instead fed with data The most powerful tool for doing this is XMLPullParser. Incrementally, without blocking operations, while enjoying the convenience of Sometimes what the user really wants is to be able to parse XML XMLParser and feed data into it incrementally, but it is a push API thatĬalls methods on a callback target, which is too low-level and inconvenient for To be read at once before returning any result. Most parsing functions provided by this module require the whole document A document type declaration may be accessed by passing aĬustom TreeBuilder instance to the XMLParserĬonstructor. Instructions in them they will be included when generating XML Than parsing from XML text can have comments and processing Nevertheless, trees built using this module’s API rather Processing instructions, and document type declarations in the
Currently, this module skips over any XML comments, Not all elements of the XML input will end up as elements of the
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