IMS Learner Information Package Accessibility for LIP XML Schema Binding Version 1.0 Final Specification

Copyright © 2003 IMS Global Learning Consortium, Inc. All Rights Reserved.
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Document Name: IMS Learner Information Package Accessibility for LIP XML Schema Binding
Revision: 18 June 2003 

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Table of Contents

1. Introduction

This document describes the XML binding for the IMS Accessibility for LIP (ACCLIP) Information Model. It specifies an XML Schema binding conformant with the W3C's XML Schema Recommendation of 2001 May 02.

An XML binding using the Document Type Definition (DTD) format is specifically excluded from this binding specification. Other XML binding types such as Resource Description Format (RDF) may be added in the future.

The prose copy of the IMS ACCLIP Information Model contained within the Information Model document are the normative and definitive specification of IMS ACCLIP. All binding structures specified herein are not normative or definitive, with the exception of names for XSD structures.

1.1 XML Basics

The conceptual model for expressing accessibility definitions is a hierarchy. Hierarchical models are convenient for representing data consisting of many elements and sub-elements. XML is perfectly suited for representing hierarchical models. An XML document is a hierarchy comprised of elements that have contents and attributes.

1.1.1 Elements

An element is a component of a document that has been identified in a way a computer can understand. Each element has a tag name. When a tag name is shown as "<TAGNAME>", with less-than and greater-than symbols before and after the tag name, it serves as the start-tag to mark the beginning of an element. When that same tag name has a forward slash "/" added, it serves as an end-tag such as "</TAGNAME>". An element may have contents between its start and end-tags, and may have one or more attributes. When an XML element has a start and end-tag (also called an opening and closing tag) with a common name, it is considered to be "well-formed" XML. The contents of an element are placed between the start and end-tags as shown below:

<TAGNAME>contents</TAGNAME>

1.1.1.1 Element Contents

An element may contain other elements, Parsed Character Data (PCDATA), Character Data (CDATA), or a mixture of PCDATA and elements. The allowable contents of an element are its content model. XML parsers treat PCDATA with their special or reserved meaning unless they are specifically marked (or "escaped"). In contrast, CDATA can use special or reserved characters without having to escape them, as CDATA is not read by XML parsers.

1.1.1.2 Element Attributes

An attribute provides additional information about an element. Attributes are a way of attaching characteristics or properties to the elements of a document. An element may have more than one attribute. Attributes are contained within the start tag of an element. Attributes are represented by an attribute name followed by an equal sign and the attribute value in quotation marks:

<timeframe>
  <begin restrict="1"> 1999-07-23 </begin>
</timeframe>

In this example, the timeframe element contains another element: the begin element. The begin element has one attribute "restrict", with the value "1". The value for the element BEGIN is "1999-07-23". These two elements then make up a timeframe begin date.

1.1.1.3 Element Names

Each element has a unique name, referred to as the tag name. XML is case-sensitive in its processing of tag names. The IMS ACCLIP XML Binding Specification adheres to the following tag name rules:

• All tag names will conform to the rules for element naming as given within the XML 1.0 Specification.
• Names beginning with "XML" in any case or mix of cases are not permitted.
• The IMS binding will use camelCase tag and element names.
• Element names may not include words reserved by the XML specification. These include:
  DOCTYPE
  ELEMENT
  ATTLIST
  ENTITY
• Tag names defined by this IMS Binding may not be redefined.

1.1.2 Document Type Definitions

The tag name, content model, and attributes of elements were historically defined in a Document Type Definition (DTD) statement. A DTD is a kind of schema. It may exist as an external file or a block of text internal to an XML document. However, the DTD schema was developed before object-oriented programming concepts became prevalent within software development communities and before the use of entities drawn from multiple namespaces became a requirement. Those communities began working on other schema representations to provide more object-like structures and procedures and to support the flexible use of multiple namespaces than could be realized within the constraints of the Document Type Definition schema for describing and structuring the contents of XML documents. One such schema language has become today's preferred representation language: XML Schema produced by the Worldwide Web Consortium (W3C).

1.1.3 XML Schemas

A schema is a formal specification of element names that indicates which elements are allowed in an XML instance, and in which combinations. New schema languages, such as those defined in the XML-Schemas Working Group, provide the same baseline functionality as a DTD. However, because these schema languages are extensible, developers can augment them with additional information, such as data types, inheritance, and presentation rules. This makes schema languages far more powerful than DTDs.

This specification defines a W3C XML Schema (imsacclip_bindv1p0.xsd) as a non-normative reference. Some XML editors may make use of these schemas to help guide the developer in creating the proper elements at the proper locations in an XML file. Other developers will make use of the schemas to validate their XML instances and/or to define extensions to the IMS Meta-Data Binding. Details of the construction of schemas are outside the scope of this document.

1.1.4 Valid Character Sets

An IMS ACCLIP definition instance must use UTF-8 encoding of the character sets as defined in ISO 10646. See the XML Version 1.0 for more details on the specification of well-formed XML.

2. Narrative Description of XML Schema Binding

This section of the specification uses a series of graph segments, accompanied by simple narrative, to describe the XML format of the XSD binding for the ACCLIP Model. XSD documents that implement this abstract format are referenced as non-normative parts of this specification.

The data and their relationships from the information model are expressed in XML Schema by means structuring entities are called elements, attributes, and groups. These structuring entities are further typified as complex types or simple types. The XML Schema structuring entities comprise a binding of an information model when expressed in a special instance of an XML document - an XML Schema definition (XSD).

The ACCLIP Model also defines values or vocabulary terms required by certain data model elements. These special {structuring} structures enable the grouping and use of elements as defined in a data model.

It is often necessary for bindings to create structuring entities with names that are not present in an information or data model that is being expressed in XML Schema. These special structuring enable the grouping and use of elements as defined in a data model.

These graphs will show individual elements encapsulated within larger structures, like complex types. Structures without child elements are not represented separately. The reader is referred to a binding document instance (.xsd) for the full lexical representation of all structures and values.

Key to graphical elements:

• Rectangle with square corners = element
• Rectangle with rounded corners, enclosed in red outline area = attribute
• Bold name in upper half of rectangle: element/attribute name
• Regular weight name in lower half of rectangle: type name

Circled Multiplicity indicator to left of element, attribute, or group:

• ? = 0..1
• * = 0..n
• + = 1..n
• D = 0..1, with default value if absent (attributes only)
• (no indicator) = 1

Red Branching lines = XML Schema grouping model connector

• Square bracket = Sequence
• Angle bracket = Choice

2.1 Extensions to Accessibility

2.1.1 accessForAll: root Element and complex Type

Implementation Notes

All accessibility preference information is contained within the <accessForAll> element. This element is a sibling of the <disability> element in the version 1.0 LIP Schema (item 3.6 in table 6.3 Accessibility of the LIP Information Model), and the <disability> element is deprecated. The other portions of table 6.3 of the LIP version 1.0 are left untouched.

Each <context> element defines a single set of access preferences. Individuals can thus define differing sets of preferences for different contexts of technology use (for example, work vs. home, or morning vs. evening). The method of determining which context is appropriate at any given time is not defined in this specification.

Note that the first <context> element in the XML instance is to be taken as the default context.

Examples

The following is a minimal implementation of a set of Learner Accessibility Preferences:

<accessForAll xml:lang = "en-US">
   <context identifier = "HomePreferences"/>
</accessForAll >

2.1.2 display: Element and complex Type

Implementation notes

Examples

2.1.3 control: Element and complex Type

Implementation Notes

Examples

2.1.4 content: Element and complex Type

Implementation Notes

Examples

2.1.5 screenReader: Element and complex Type

Implementation Notes

Examples

2.1.6 screenEnhance: Element and complex Type

Implementation Notes

Note that all colors are bound as 4-octet hexadecimal strings (for example, "001122FF") representing RGBa values. The first octet ("00" in the previous example) is for red, the second octet ("11") is for green, the third octet ("22") for blue, and the last octet ("FF") for alpha. An alpha value of 00 is completely transparent, while an alpha value of FF is completely opaque.

Examples

2.1.7 textReadingHighlight: Element and complex Type

Implementation Notes

Examples

2.1.8 braille: Element and complex Type

Implementation Notes

Examples

2.1.9 tactile: Element and complex Type

Implementation Notes

Examples

2.1.10 visualAlert: Element and complex Type

Implementation Notes

Examples

2.1.11 structuralPresentation: Element and complex Type

Implementation Notes

Examples

2.1.12 keyboardEnhanced: Element and complex Type

Implementation Notes

Examples

2.1.13 onscreenKeyboard: Element and complex Type

Implementation Notes

Examples

2.1.14 alternativeKeyboard: Element and complex Type

Implementation Notes

Examples

2.1.15 mouseEmulation: Element and complex Type

Implementation Notes

Examples

2.1.16 alternativePointing: Element and complex Type

Implementation Notes

Examples

2.1.17 voiceRecognition: Element and complex Type

Implementation Notes

Examples

2.1.18 prediction: Element and complex Type

Implementation Notes

Examples

2.1.19 codedInput

Implementation Notes

Examples

2.1.20 structuralNavigation: Element and complex Type

Implementation Notes

Examples

2.1.21 alternativesToVisual: Element and complex Type

Implementation Notes

Examples

2.1.22 alternativesToText: Element and complex Type

Implementation Notes

Examples

2.1.23 alternativesToAuditory: Element and complex Type

Implementation Notes

Examples

2.1.24 visualText: Element and complex Type

Implementation Notes

Examples

2.1.25 learnerScaffold: Element and complex Type

Implementation Notes

Examples

2.1.26 personalStylesheet: Element and complex Type

Implementation Notes

Examples

2.1.27 futureTechnology: Element and complex Type

Implementation Notes

Examples

2.1.28 application: Element and complex Type

Implementation Notes

Examples

2.2 Extensions to Eligibility

2.2.1 accommodation: Element

Implementation Notes

Examples

2.2.2 accommodationPackage: Element

Implementation Notes

Examples

3. ACCLIP Element Mapping

This section contains several tables. Table 3.1 maps <accessForAll> elements by number and name as listed in the ACCLIP Information Model specification to the XML Schema entity used to represent it in the XML Schema binding. Table 3.2 does the same thing for <context> elements. The Schema entity's name, kind of structure, and type are provided. Note that all "usage" attributes are of type "usageType"; this is not explicitly noted in the table.

The ACCLIP Information Model identifies data elements in a dot-delimited enumeration and by name. The dot-delimited enumeration typifies the relationship of elements to each other, where elements with a numeral following a dot are subordinate to elements that share the same numeric value to the left of a dot. The enumeration typically does not imply a strict sequence or order of occurrence. It merely implies a group relationship.

Table 3.1 also includes references to additional XML Schema structures used to properly express the relationships or controlled lists of <accessibility> element values. These additional XML Schema structures are inserted into Table 3.1 in proximity to the <accessibility> elements they describe.

XSD elements of type complexType and simpleType may be nested. Table 3.1 does not show this nesting. Separate tables in this section provide the further details for nested elements defined as complexType or simpleType. In those tables, the element number from the Accessibility model and the XML Schema element name are used to associate a nested Schema structuring entity with the appropriate element from the Accessibility model.

No.	IM Element Name	XSD Entity Name	XSD Structure	XSD Type
1	accessForAll	accessForAll	Element	accessForAllElementType
1.1	context	context	Element	contextElementType

No.	IM Element Name	XSD Entity Name	XSD Structure	XSD Type
1	context	context	Element	contextElementType
1.1	identifier	identifier	Attribute
1.2	external	external	Attribute
1.3	language	xml:lang	Attribute
	default		Implicit	No type; true for the first context element in the XML instance, false otherwise.
1.4	display	display	Element	displayElementType
1.5	control	screenReader	Element	screenReaderElementType
1.6	content	screenReaderGeneric	Element	ScreenReaderGenericElementType

No.	IM Element Name	XSD Entity Name	XSD Structure	XSD Type
1	display	display	Element	displayElementType
1.1	screenReader	screenReader	Element	screenReaderElementType
1.1.1	screenReaderGeneric	screenReaderGeneric	Element	ScreenReaderGenericElementType
1.1.1.1	link	link/@value	Attribute	linkActionType
1.1.1.1.1	usage	link/@usage	Attribute	string
1.1.1.2	speechRate	speechRate/@value	Attribute	speechRateType
1.1.1.2.1	usage	speechRate/@usage	Attribute	string
1.1.1.3	pitch	pitch/@value	Attribute	sliderType
1.1.1.3.1	usage	pitch/@usage	Attribute	string
1.1.1.4	volume	volume/@value	Attribute	sliderType
1.1.1.4.1	usage	volume/@usage	Attribute	string
1.1.2	application	application	Element	See Application Element Sub-table
1.2	screenEnhance	screenEnhance	Element	screenEnhanceElementType
1.2.1	screenEnhanceGeneric	screenEnhanceGeneric	Element	screenEnhanceGenericElementType
1.2.1.1	fontFace	fontFace	Element	fontFaceElementType
1.2.1.1.1	fontName	fontName/@value	Attribute	string
1.2.1.1.1.1	usage	fontName/@usage	Attribute	string
1.2.1.1.2	genericFace	genericFace/@value	Attribute	genericFaceType
1.2.1.1.2.1	usage	genericFace/@usage	Attribute	string
1.2.1.2	fontSize	fontSize/@value	Attribute	positiveInteger
1.2.1.2.1	usage	fontSize/@usage	Attribute	string
1.2.1.3	foregroundColor	foregroundColor/@value	Attribute	colorType
1.2.1.3.1	usage	foregroundColor/@usage	Attribute	string
1.2.1.4	backgroundColor	backgroundColor/@value	Attribute	colorType
1.2.1.4.1	usage	backgroundColor/@usage	Attribute	string
1.2.1.5	highlightColor	highlightColor/@value	Attribute	colorType
1.2.1.5.1	usage	highlightColor/@usage	Attribute	string
1.2.1.6	cursorSize	cursorSize/@value	Attribute	cursorSizeType
1.2.1.6.1	usage	cursorSize/@usage	Attribute	string
1.2.1.7	cursorColor	cursorColor/@value	Attribute	colorType
1.2.1.7.1	usage	cursorColor/@usage	Attribute	string
1.2.1.8	cursorTrails	cursorTrails/@value	Attribute	sliderType
1.2.1.8.1	usage	cursorTrails/@usage	Attribute	string
1.2.2	invertColorChoice	invertColorChoice/@value	Attribute	Boolean
1.2.2.1	usage	invertColorChoice/@usage	Attribute	string
1.2.3	tracking	tracking	Element	trackingElementType
1.2.3.1	mouse	mouse/@value	Attribute	boolean
1.2.3.1.1	usage	mouse/@usage	Attribute	string
1.2.3.2	caret	caret/@value	Attribute	boolean
1.2.3.2.1	usage	caret/@usage	Attribute	string
1.2.3.3	focus	focus/@value	Attribute	boolean
1.2.3.3.1	usage	focus/@usage	Attribute	string
1.2.4	magnification	magnification/@value	Attribute	integer
1.2.4.1	usage	magnification/@usage	Attribute	string
1.2.5	application	application	Element	See Application Element Sub-table
1.3	textReadingHighlight	textReadingHighlight	Element	textReadingHighlightElementType
1.3.1	textReadingHighlightGeneric	textReadingHighlightGeneric	Element	textReadingHighlightGenericElementType
1.3.1.1	speechRate	speechRate/@value	Attribute	speechRateType
1.3.1.1.1	usage	speechRate/@usage	Attribute	string
1.3.1.2	pitch	pitch/@value	Attribute	sliderType
1.3.1.2.1	usage	pitch/@usage	Attribute	string
1.3.1.3	volume	volume/@value	Attribute	sliderType
1.3.1.3.1	usage	volume/@usage	Attribute	string
1.3.1.4	highlight	highlight/@value	Attribute	highlightType
1.3.1.4.1	usage	highlight/@usage	Attribute	string
1.3.1.5	speakAltText	speakAltText/@value	Attribute	boolean
1.3.1.5.1	usage	speakAltText/@usage	Attribute	string
1.3.1.6	speakWhenTabbing	speakWhenTabbing/@value	Attribute	boolean
1.3.1.6.1	usage	speakWhenTabbing/@usage	Attribute	string
1.3.1.7	readingUnit	readingUnit/@value	Attribute	readingUnitType
1.3.1.7.1	usage	readingUnit/@usage	Attribute	string
1.3.2	application	application	Element	See Application Element Sub-table
1.4	braille	braille	Element	brailleElementType
1.4.1	brailleGeneric	brailleGeneric	Element	brailleGenericElementType
1.4.1.1	grade	grade/@value	Attribute	brailleGradeType
1.4.1.1.1	usage	grade/@usage	Attribute	string
1.4.1.2	numDots	numDots/@value	Attribute	brailleDotCountType
1.4.1.2.1	usage	numDots/@usage	Attribute	string
1.4.1.3	numCells	numCells/@value	Attribute	brailleCellCountType
1.4.1.3.1	usage	numCells/@usage	Attribute	string
1.4.1.4	markHighlight	markHighlight/@value	Attribute	boolean
1.4.1.4.1	usage	markHighlight/@usage	Attribute	string
1.4.1.5	markBold	markBold/@value	Attribute	boolean
1.4.1.5.1	usage	markBold/@usage	Attribute	string
1.4.1.6	markUnderline	markUnderline/@value	Attribute	boolean
1.4.1.6.1	usage	markUnderline/@usage	Attribute	string
1.4.1.7	markItalic	markItalic/@value	Attribute	boolean
1.4.1.7.1	usage	markItalic/@usage	Attribute	string
1.4.1.8	markStrikeout	markStrikeout/@value	Attribute	boolean
1.4.1.8.1	usage	markStrikeout/@usage	Attribute	string
1.4.1.9	markColor	markColor/@value	Attribute	boolean
1.4.1.9.1	usage	markColor/@usage	Attribute	string
1.4.1.10	dotPressure	dotPressure/@value	Attribute	sliderType
1.4.1.10.1	usage	dotPressure/@usage	Attribute	string
1.4.1.11	statusCell	statusCell/@value	Attribute	brailleStatusCellType
1.4.1.11.1	usage	statusCell/@usage	Attribute	string
1.4.2	application	application	Element	See Application Element Sub-table
1.5	tactile	tactile	Element	tactileElementType
1.5.1	tactileGeneric	tactileGeneric	Element	tactileGenericElementType
1.5.2	application	application	Element	See Application Element Sub-table
1.6	visualAlert	visualAlert	Element	visualAlertElementType
1.6.1	visualAlertGeneric	visualAlertGeneric	Element	visualAlertGenericElementType
1.6.1.1	systemSounds	systemSounds/@value	Attribute	soundReplacementType
1.6.1.1.1	usage	systemSounds/@usage	Attribute	string
1.6.1.2	captions	captions/@value	Attribute	boolean
1.6.1.2.1	usage	captions/@usage	Attribute	string
1.6.2	application	application	Element	See Application Element Sub-table
1.7	structuralPresentation	structuralPresentation	Element	structuralPresentationElementType
1.7.1	contentDensity	contentDensity/@value	Attribute	contentDensityType
1.7.1.1	usage	contentDensity/@usage	Attribute	string
1.7.2	contentViews	contentViews/@value	Attribute	contentViewsType
1.7.2.1	usage	contentViews/@usage	Attribute	string
1.7.3	showLinks	showLinks/@value	Attribute	boolean
1.7.3.1	usage	showLinks/@usage	Attribute	string
1.7.4	showTranscript	showTranscript/@value	Attribute	boolean
1.7.4.1	usage	showTranscript/@usage	Attribute	string
1.7.5	showNotes	showNotes/@value	Attribute	boolean
1.7.5.1	usage	showNotes/@usage	Attribute	string
1.7.6	windowLayout	windowLayout/@value	Attribute	windowLayoutElementType
1.7.6.1	usage	windowLayout/@usage	Attribute	string
1.8	futureTechnology	futureTechology	Element	futureTechnologyElementType
1.8.1	application	application	Element	See Application Element Sub-table

No.	IM Element Name	XSD Entity Name	XSD Structure	XSD Type
1	control	control	Element	controlElementType
1.1	keyboardEnhanced	keyboardEnhanced	Element	keyboardEnhancedElementType
1.1.1	keyboardEnhancedGeneric	keyboardEnhancedGeneric	Element	keyboardEnhancedGenericElementType
1.1.1.1	alphaLayoutInternal	alphaLayoutInternal/@value	Attribute	keyboardLayoutType
1.1.1.1.1	usage	alphaLayoutInternal/@usage	Attribute	string
1.1.1.2	alphaLayoutExternal	alphaLayoutExternal/@value	Attribute	anyURI
1.1.1.2.1	usage	alphaLayoutExternal/@usage	Attribute	string
1.1.1.2	stickyKeys	stickyKeys/@value	Attribute	boolean
1.1.1.2.1	usage	stickyKeys/@usage	Attribute	string
1.1.1.2.2	playSound	playSound/@value	Attribute	boolean
1.1.1.2.2.1	usage	playSound/@usage	Attribute	string
1.1.1.3	repeatKeys	repeatKeys/@value	Attribute	boolean
1.1.1.3.1	usage	repeatKeys/@usage	Attribute	string
1.1.1.3.2	autoDelay	autoDelay/@value	Attribute	sliderType
1.1.1.3.2.1	usage	autoDelay/@usage	Attribute	string
1.1.1.3.2.2	autoRate	autoRate/@value	Attribute	sliderType
1.1.1.3.2.2.1	usage	autoRate/@usage	Attribute	string
1.1.1.4	slowKeys	slowKeys/@value	Attribute	boolean
1.1.1.4.1	usage	slowKeys/@usage	Attribute	string
1.1.1.4.1	slowKeysInterval	slowKeysInterval/@value	Attribute	sliderType
1.1.1.4.1.1	usage	slowKeysInterval/@usage	Attribute	string
1.1.1.5	debounce	debounce/@value	Attribute	boolean
1.1.1.5.1	usage	debounce/@usage	Attribute	string
1.1.1.5.2	debounceInterval	debounceInterval/@value	Attribute	secondsType
1.1.1.5.2.1	usage	debounceInterval/@usage	Attribute	string
1.1.2	application	application	Element	See Application Element Sub-table
1.2	onscreenKeyboard	onscreenKeyboard	Element	onscreenKeyboardElementType
1.2.1	onscreenKeyboardGeneric	onscreenKeyboardGeneric	Element	onscreenKeyboardGenericElementType
1.2.1.1	alphaLayoutInternal	alphaLayoutInternal/@value	Attribute	keyboardLayoutType
1.2.1.1.1	usage	alphaLayoutInternal/@usage	Attribute	string
1.2.1.2	alphaLayoutExternal	alphaLayoutExternal/@value	Attribute	anyURI
1.2.1.2.1	usage	alphaLayoutExternal/@usage	Attribute	string
1.2.1.3	pointAndClick	pointAndClick	Element	pointAndClickElementType
1.2.1.3.1	usage	pointAndClick/@usage	Attribute	string
1.2.1.3.2	switchDelay	switchDelay/@value	Attribute	secondsType
1.2.1.3.2.1	usage	switchDelay/@usage	Attribute	string
1.2.1.4	pointAndDwell	pointAndDwell	Element	pointAndDwellElementType
1.2.1.4.1	usage	pointAndDwell/@usage	Attribute	string
1.2.1.4.2	dwellTime	dwellTime/@value	Attribute	secondsType
1.2.1.4.2.1	usage	dwellTime/@usage	Attribute	string
1.2.1.5	autoScanning	autoScanning	Element	autoScanningElementType
1.2.1.5.1	usage	autoScanning/@usage	Attribute	string
1.2.1.5.1	scanSpeed	scanSpeed/@value	Attribute	secondsType
1.2.1.5.1.1	usage	scanSpeed/@usage	Attribute	string
1.2.1.5.2	scanSwitchDelay	scanSwitchDelay/@value	Attribute	secondsType
1.2.1.5.2.1	usage	scanSwitchDelay/@usage	Attribute	string
1.2.1.5.3	switchType	switchType	Element	switchTypeElementType
1.2.1.5.3.1	usage	switchType/@usage	Attribute	string
1.2.1.5.4	autoScanInitDelay	autoScanInitDelay/@value	Attribute	secondsType
1.2.1.5.4.1	usage	autoScanInitDelay/@usage	Attribute	string
1.2.1.5.5	autoScanRepeat	autoScanRepeat/@value	Attribute	autoScanRepeatType
1.2.1.5.5.1	usage	autoScanRepeat/@usage	Attribute	string
1.2.1.5.6	switchAssignment	switchAssignment/@value	Attribute	groupItemSwitchAssignmentType
1.2.1.5.6.1	number	switchAssignment/@number	Attribute	positive integer
1.2.1.5.6.2	usage	switchAssignment/@usage	Attribute	string
1.2.1.6	inverseScanning	inverseScanning	Element	inverseScanningElementType
1.2.1.6.1	usage	inverseScanning/@usage	Attribute	string