03-07-2013
There are PERL tutorials on the web that are a fine use of your time, and I am told it is the most versatile tool of all, being midway between c/C++/JAVA and shell/sed/awk. Learning it is a big task for a newcomer to computers, but learning your first language and O/S language interface is a big task regardless.
A tool like sed or sed-like-perl can copy the file, capturing lines (sed h, d) it finds by context (sed /pattern/ and N) and moving them (sed G) to new places it finds by context.
https://www.unix.com/man-page/All/1/sed/
However, the only really robust way to adjust an XML file is to use or create an XML-aware tool. PERL/C++/JAVA have XML parsers that will put the document in memory as a container object (DOM). Once there, you can adjust the content and write a new XML file.
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LEARN ABOUT DEBIAN
xml::dom::text
XML::DOM::Text(3pm) User Contributed Perl Documentation XML::DOM::Text(3pm)
NAME
XML::DOM::Text - A piece of XML text in XML::DOM
DESCRIPTION
XML::DOM::Text extends XML::DOM::CharacterData, which extends XML::DOM::Node.
The Text interface represents the textual content (termed character data in XML) of an Element or Attr. If there is no markup inside an
element's content, the text is contained in a single object implementing the Text interface that is the only child of the element. If
there is markup, it is parsed into a list of elements and Text nodes that form the list of children of the element.
When a document is first made available via the DOM, there is only one Text node for each block of text. Users may create adjacent Text
nodes that represent the contents of a given element without any intervening markup, but should be aware that there is no way to represent
the separations between these nodes in XML or HTML, so they will not (in general) persist between DOM editing sessions. The normalize()
method on Element merges any such adjacent Text objects into a single node for each block of text; this is recommended before employing
operations that depend on a particular document structure, such as navigation with XPointers.
METHODS
splitText (offset)
Breaks this Text node into two Text nodes at the specified offset, keeping both in the tree as siblings. This node then only contains
all the content up to the offset point. And a new Text node, which is inserted as the next sibling of this node, contains all the con-
tent at and after the offset point.
Parameters:
offset The offset at which to split, starting from 0.
Return Value: The new Text node.
DOMExceptions:
* INDEX_SIZE_ERR
Raised if the specified offset is negative or greater than the number of characters in data.
* NO_MODIFICATION_ALLOWED_ERR
Raised if this node is readonly.
perl v5.8.8 2008-02-03 XML::DOM::Text(3pm)