# Poco::XML

# class Attributes

Library: XML
Package: SAX
Header: Poco/SAX/Attributes.h

## Description

Interface for a list of XML attributes. This interface allows access to a list of attributes in three different ways:

1. by attribute index;
2. by Namespace-qualified name; or
3. by qualified (prefixed) name.

The list will not contain attributes that were declared #IMPLIED but not specified in the start tag. It will also not contain attributes used as Namespace declarations (xmlns*) unless the http://xml.org/sax/features/namespace-prefixes feature is set to true (it is false by default).

If the namespace-prefixes feature (see above) is false, access by qualified name may not be available; if the http://xml.org/sax/features/namespaces feature is false, access by Namespace-qualified names may not be available. This interface replaces the now-deprecated SAX1 AttributeList interface, which does not contain Namespace support. In addition to Namespace support, it adds the getIndex methods (below). The order of attributes in the list is unspecified, and will vary from implementation to implementation.

## Inheritance

Known Derived Classes: AttributesImpl

## Member Summary

Member Functions: getIndex, getLength, getLocalName, getQName, getType, getURI, getValue

## Destructor

### ~Attributes

virtual ~Attributes();

## Member Functions

### getIndex

virtual int getIndex(
const XMLString & name
) const = 0;

Look up the index of an attribute by a qualified name.

### getIndex

virtual int getIndex(
const XMLString & namespaceURI,
const XMLString & localName
) const = 0;

Look up the index of an attribute by a namspace name.

### getLength

virtual int getLength() const = 0;

Return the number of attributes in the list.

Once you know the number of attributes, you can iterate through the list.

### getLocalName

virtual const XMLString & getLocalName(
int i
) const = 0;

Look up a local attribute name by index.

### getQName

virtual const XMLString & getQName(
int i
) const = 0;

Look up a qualified attribute name by index.

### getType

virtual const XMLString & getType(
int i
) const = 0;

Look up an attribute type by index.

The attribute type is one of the strings "CDATA", "ID", "IDREF", "IDREFS", "NMTOKEN", "NMTOKENS", "ENTITY", "ENTITIES", or "NOTATION" (always in upper case).

If the parser has not read a declaration for the attribute, or if the parser does not report attribute types, then it must return the value "CDATA" as stated in the XML 1.0 Recommendation (clause 3.3.3, "Attribute-Value Normalization").

For an enumerated attribute that is not a notation, the parser will report the type as "NMTOKEN".

### getType

virtual const XMLString & getType(
const XMLString & qname
) const = 0;

Look up an attribute type by a qualified name.

See getType(int) for a description of the possible types.

### getType

virtual const XMLString & getType(
const XMLString & namespaceURI,
const XMLString & localName
) const = 0;

Look up an attribute type by a namespace name.

See getType(int) for a description of the possible types.

### getURI

virtual const XMLString & getURI(
int i
) const = 0;

Look up a namespace URI by index.

### getValue

virtual const XMLString & getValue(
int i
) const = 0;

Look up an attribute value by index.

If the attribute value is a list of tokens (IDREFS, ENTITIES, or NMTOKENS), the tokens will be concatenated into a single string with each token separated by a single space.

### getValue

virtual const XMLString & getValue(
const XMLString & qname
) const = 0;

Look up an attribute value by a qualified name.

See getValue(int) for a description of the possible values.

### getValue

virtual const XMLString & getValue(
const XMLString & uri,
const XMLString & localName
) const = 0;

Look up an attribute value by a namespace name.

See getValue(int) for a description of the possible values.