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Contents

1 Introduction

2 Packages

Packages on Hackage in the category XML

2.1 xml

Module name: Text.XML.Light

Types:

Content, Element, CData, Attr
are all instances of
typeclass Node

A Node instance is anything which has some convention for generating an Element out of it.

Useful notes:
Content
has constructors for
Elem
and
Text
.
CData
can be of kind
CDataText
. The type
QName
(qualified name) denotes a name with its qualifying namespace attached to it.


Snippets of essentials:

Read the few [test cases]


Constructing

let n = blank_name{qName = "td"}
let n2 = unqual "td"
let d = blank_cdata{cdData = "some data here"}
blank_element {elName = n, elContent = [Text d]}
using node
qn _
, generally expands to node
qn ([attrs], [content])
, where it lifts any child data provided into a content list and ensures any attribute provided is lifted into an attribute list.
unode
just makes a name out of an unqualified name before calling node.
unode "td" () 
unode "td" $ Attr (unqual "width") "10"
unode "td" $ "some data"
unode "tr" [Elem $ unode "td" "some data", Text $ blank_cdata{cdData = "free text"}]


Input

parseXMLDoc "<tr><td>some data here</td></tr>"
parseXML "<car><color>red</color></car><car><color>orange</color></car>"


Output

showContent $ head $ parseXML "<car><color>black</color></car>"
ppContent $ head $ parseXML "<car><color>black</color></car>"


Searching

findChildren blank_name{qName="td"}  $ fromJust $ parseXMLDoc "<tr><td>child1<td>inside</td></td><skip></skip><td>child2</td></tr>"
filterChildren (\e -> (qName $ elName e) == "skip")  $ fromJust $ parseXMLDoc "<tr><td>child1<td>inside</td></td><skip></skip><td>child2</td></tr>"
findAttr (blank_name{qName = "width"}) $ fromJust $ parseXMLDoc "<tr width=10><td>child1<td>inside</td></td><skip></skip><td>child2</td></tr>"


3 Blog articles

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