hxt-8.5.4: A collection of tools for processing XML with Haskell.

MaintainerUwe Schmidt (uwe@fh-wedel.de)



The core data types of the HXT DOM.



data QName Source

Namespace support for element and attribute names.

A qualified name consists of a name prefix, a local name and a namespace uri. All modules, which are not namespace aware, use only the localPart component. When dealing with namespaces, the document tree must be processed by Text.XML.HXT.Arrow.Namespace.propagateNamespaces to split names of structure "prefix:localPart" and label the name with the apropriate namespace uri


Eq QName

Two QNames are equal if (1. case) namespaces are both empty and the qualified names (prefix:localpart) are the same or (2. case) namespaces are set and namespaces and local parts both are equal

Ord QName 
Read QName 
Show QName 
Typeable QName 
NFData QName 

type XName = AtomSource

XML names are represented by Strings, but these strings do not mix up with normal strings. Names are always reduced to normal form, and they are stored internally in a name cache for sharing equal names by the same data structure

type NsEnv = AssocList XName XNameSource

Type for the namespace association list, used when propagating namespaces by modifying the QName values in a tree

mkQName :: String -> String -> String -> QNameSource

constructs a complete qualified name with namePrefix, localPart and namespaceUri. This function can be used to build not wellformed prefix:localpart names. The XPath module uses wildcard names like xxx:*. These must be build with mkQName and not with mkName.

mkName :: String -> QNameSource

constructs a simple, namespace unaware name. If the name is in prefix:localpart form and the prefix is not empty the name is split internally into a prefix and a local part.

mkNsName :: String -> String -> QNameSource

constructs a simple, namespace aware name, with prefix:localPart as first parameter, namspace uri as second.

see also mkName, mkPrefixLocalPart

mkSNsName :: String -> QNameSource

old name for mkName

mkPrefixLocalPart :: String -> String -> QNameSource

constructs a simple name, with prefix and localPart but without a namespace uri.

see also mkQName, mkName

equivQName :: QName -> QName -> BoolSource

Equivalent QNames are defined as follows: The URIs are normalized before comparison. Comparison is done with equalQNameBy and equivUri

equivUri :: String -> String -> BoolSource

Comparison of normalized namespace URIs using normalizeNsUri

equalQNameBy :: (String -> String -> Bool) -> QName -> QName -> BoolSource

Sometimes a weaker equality relation than equalQName is appropriate, e.g no case significance in names, ... a name normalization function can be applied to the strings before comparing. Called by equalQName and equivQName

namePrefix' :: QName -> XNameSource

access name prefix

localPart' :: QName -> XNameSource

access local part

namespaceUri' :: QName -> XNameSource

access namespace uri

setNamePrefix' :: XName -> QName -> QNameSource

set name prefix

setLocalPart' :: XName -> QName -> QNameSource

set local part

setNamespaceUri' :: XName -> QName -> QNameSource

set name prefix

qualifiedName :: QName -> StringSource

builds the full name "prefix:localPart", if prefix is not null, else the local part is the result

universalName :: QName -> StringSource

builds the "universal" name, that is the namespace uri surrounded with "{" and "}" followed by the local part (specialisation of buildUniversalName)

universalUri :: QName -> StringSource

builds an "universal" uri, that is the namespace uri followed by the local part. This is usefull for RDF applications, where the subject, predicate and object often are concatenated from namespace uri and local part (specialisation of buildUniversalName)

buildUniversalName :: (String -> String -> String) -> QName -> StringSource

builds a string from the namespace uri and the local part. If the namespace uri is empty, the local part is returned, else namespace uri and local part are combined with the combining function given by the first parameter

normalizeNsUri :: String -> StringSource

Normalization of URIs: Normalization is done by conversion into lowercase letters. A trailing "/" is ignored

setNamespace :: NsEnv -> QName -> QNameSource

Compute the name prefix and the namespace uri for a qualified name.

This function does not test whether the name is a wellformed qualified name. see Namespaces in XML Rule [6] to [8]. Error checking is done with separate functions, see isWellformedQName and isWellformedQualifiedName for error checking.

isNCName :: String -> BoolSource

test for wellformed NCName, rule [4] XML Namespaces

isWellformedQualifiedName :: String -> BoolSource

test for wellformed QName, rule [6] XML Namespaces predicate is used in filter valdateNamespaces.

isWellformedQName :: QName -> BoolSource

test for wellformed QName values. A QName is wellformed, if the local part is a NCName, the namePrefix, if not empty, is also a NCName. predicate is used in filter valdateNamespaces.

isWellformedNSDecl :: QName -> BoolSource

test whether an attribute name is a namesapce declaration name. If this is not the case True is the result, else the name must be a well formed namespace name: All namespace prefixes starting with "xml" are reserved for XML related definitions. predicate is used in filter valdateNamespaces.

isWellformedNameSpaceName :: QName -> BoolSource

test for a namespace name to be well formed

isNameSpaceName :: QName -> BoolSource

test whether a name is a namespace declaration attribute name

isDeclaredNamespace :: QName -> BoolSource

predicate is used in filter valdateNamespaces.