[yunqa.de] Re: [DIXml] Preserving empty lines/blanks in an XML-file/Hierarchical structure
- From: Delphi Inspiration <delphi@xxxxxxxx>
- To: yunqa@xxxxxxxxxxxxx
- Date: Mon, 24 Dec 2007 12:18:56 +0100
Hello WeikEngOff@xxxxxxx,
>I want know how empty lines in an XML-file are usually handled. Is there any
>"standard" for preserving? How is that handled in your DIXml-library?
DIXml preserves line breaks. This naturally includes empty lines, which are
just consecutive line breaks.
As required by the XML specicfication (2.11 End-of-Line Handling), DIXml
converts all line breaks to a single $0A. Here is the relevant passage:
"the XML processor MUST behave as if it normalized all line breaks in external
parsed entities (including the document entity) on input, before parsing, by
translating both the two-character sequence #xD #xA and any #xD that is not
followed by #xA to a single #xA character."
>Same question with blanks when used for formatting.
When building a DOM node structure, DIXml can automatically remove blank nodes.
These two functions control this behaviour on a global / thread level:
function xmlKeepBlanksDefault( Val: C_int): C_int;
function xmlThrDefKeepBlanksDefaultValue( v: C_int): C_int;
For document-specific behaviour, pass the XML_PARSE_NOBLANKS option to the
xmlReadFile, xmlCtxtUseOptions, and related functions.
>Is an hierarchical structure (not "flat") possible (export) with your
>DIXml-library?
Not exactly sure what you mean, but yes, functions like xmlDocDumpFormatMemory
do output line breaks and empty lines.
Ralf
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