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+NOTE: If you used the earlier APIs released by Versit
+then you will want to look at the document "migrate.doc"
+included with this package. It contains a discussion of
+the differences between the old API and this one.
+
+----------------------------------------------------------------
+
+The vCard/vCalendar C interface is implemented in the set 
+of files as follows:
+
+vcc.y, yacc source, and vcc.c, the yacc output you will use
+implements the core parser
+
+vobject.c implements an API that insulates the caller from
+the parser and changes in the vCard/vCalendar BNF
+
+port.h defines compilation environment dependent stuff
+
+vcc.h and vobject.h are header files for their .c counterparts
+
+vcaltmp.h and vcaltmp.c implement vCalendar "macro" functions
+which you may find useful.
+
+test.c is a standalone test driver that exercises some of
+the features of the APIs provided. Invoke test.exe on a
+VCARD/VCALENDAR input text file and you will see the pretty
+print output of the internal representation (this pretty print
+output should give you a good idea of how the internal 
+representation looks like -- there is one such output in the 
+following too). Also, a file with the .out suffix is generated 
+to show that the internal representation can be written back 
+in the original text format.
+
+-----------------------------------------------------------------
+			
+			  
+				VObject for VCard/VCalendar
+
+Table of Contents
+=================
+1. VObject
+2. Internal Representations of VCard/VCalendar
+3. Iterating Through VObject's Properties or Values
+4. Pretty Printing a VObject Tree
+5. Building A VObject Representation of A VCard/VCalendar
+6. Converting A VObject Representation Into Its Textual Representation
+7. Miscellaneous Notes On VObject APIs usages
+8. Brief descriptions of each APIs
+9. Additional Programming Notes.
+
+This document is mainly about the VObject and its APIs. The main
+use of a VObject is to represent a VCard or a VCalendar inside
+a program. However, its use is not limited to aforemention as it
+can represent an arbitrary information that makes up of a tree or
+forest of properties/values.
+
+1. VObject
+   =======
+A VObject can have a name (id) and a list of associated properties and
+a value. Each property is itself a VObject.
+
+2. Internal Representations of VCard/VCalendar
+   ===========================================
+A list of VCard or a VCalendar is represented by a list of VObjects.
+The name (id) of the VObjects in the list is either VCCardProp or
+VCCalProp. Each of these VObjects can have a list of properties.
+Since a property is represented as a VObject, each of these properties
+can have a name, a list of properties, and a value.
+
+For example, the input file "vobject.vcf":
+	
+BEGIN:VCARD
+N:Alden;Roland
+FN:Roland H. Alden
+ORG:AT&T;Versit Project Office
+TITLE:Consultant
+EMAIL;WORK;PREF;INTERNET:sf!rincon!ralden@alden.attmail.com
+EMAIL;INTERNET:ralden@sfgate.com
+EMAIL;MCIMail:242-2200
+LABEL;DOM;POSTAL;PARCEL;HOME;WORK;QUOTED-PRINTABLE:Roland H. Alden=0A=
+Suite 2208=0A=
+One Pine Street=0A=
+San Francisco, CA 94111
+LABEL;POSTAL;PARCEL;HOME;WORK;QUOTED-PRINTABLE:Roland H. Alden=0A=
+Suite 2208=0A=
+One Pine Street=0A=
+San Francisco, CA 94111=0A=
+U.S.A.
+TEL;WORK;PREF;MSG:+1 415 296 9106
+TEL;WORK;FAX:+1 415 296 9016
+TEL;MSG;CELL:+1 415 608 5981
+ADR:;Suite 2208;One Pine Street;San Francisco;CA;94111;U.S.A.
+SOUND:ROW-LAND H ALL-DIN
+LOGO;GIF;BASE64:
+    R0lGODdhpgBOAMQAAP///+/v797e3s7Ozr29va2trZycnIyMjHt7e2NjY1JSUkJC
+    QjExMSEhIRAQEO///87v9973/73n95zW71K13jGl1nvG50Kt3iGc1gCMzq3e94zO
+    7xCU1nO952O15wAAACwAAAAApgBOAAAF/yAgjmRpnmiqrmzrvnAsz3Rt33iu73zv
+    /8CgcEj8QTaeywWTyWCUno2kSK0KI5tLc8vtNi+WiHVMlj0mFK96nalsxOW4fPSw
+    cNj4tQc+7xcjGh4WExJTJYUTFkp3eU0eEH6RkpOUlTARhRoWm5ydFpCWoS0QEqAu
+    ARKaHRcVjV0borEoFl0cSre4Sq67FA+yvwAeTU8XHZ7HmxS6u2wVfMCVpAE3pJoW
+    ylrMptDcOqSF4OHg3eQ5pInInb7lcc86mNbLzBXsZbRfUOn6ucyNHvVWJHCpQFDf
+    MWwEEzLqx2YCQCqF3OnItClJNmYcJD7cSAKTuI/gtnEcOQKkyVIk6/+ds5CkFcMM
+    61LiENikwi1jBnNyuvUSjwWZOS5uIZarqNFcNl32XMMB6I06GgoJ+bZp1ZKeDl8E
+    +MC1K1cBIhZ4HUu2LAsCZdOWRQDt20lxIlccSHsgrNq7Xc/ixcsWmNu34WKyYJCW
+    gQjCe9XqTZy2L4pv04gg2sSKSc8OLgTcBSuWsdkVaD2TdXyiQxebFyjo1Gnx6tJm
+    LuaqrdtZtNfFtruSNmF5IKujwIsmJbjwtRqNJhrcNVw79wcRAgogmE4ArIjQzj/s
+    JvHAGCFDQR4UqigPK4sBe62XwO51OwADiMcqUG+iOdcFAL+hW20BfAoEexlwAnu6
+    mZDAXQ1EVh//WfhxJB5gIbHgwFgOTOiVAgOuVQKAfKFg3weGwSBYFZMp4hpDGKyA
+    3lgJKECWgiMQyBVpW+0V4oJjNfhCNkR1IgWEb21QlRK9GdfFCgeOZYBsXgm4noYj
+    GEBhAQHYh0J8XenoQnFGdrkUciJY6FUAK15ogozakcBhliKsyZWHDMZQ0wWC/Aim
+    DB6h01KRr/lXQgFxAqDcWDACgCZpUnrVQJtjwTnWjS6MWAYqqfDnSaEkJOlVXQBo
+    2pWTMUJ53WgAuPncCR9q6VQMAYjZlXWJmknCoSUM2p4BC+SaKwG88hoZlvfFMM4f
+    hQh5TXkv+RklWYtC91mopJIAKFkJlDAW/wF25ShnLbeo5gmQ+1FGkJdrKCuCi2OR
+    BuwHBcwqKgABrMtVAgpem61XkLbAJ7n8uiIpvGVhO4KpH1QLbbpqLheZvQCkGoNL
+    thSzSTg2UGVBBzbtaxwKsYrmgLvRAlCmWgwMAADD66rKAgR3XlGspcdkZYK8ibU7
+    asgEl+XAyB8I7PCqMWiWncGGimpfAgO4ypXSPpOVLwsRCDJxRD2AoyeRRv5kApO5
+    fXwzwvfOKLKtaTWtbQxccmGLTZy8xYlVSvXbhbk0M2YzrYfJJ0K8m+V9NgxpyC04
+    UycI/aiuiH9Y8NftDUwWp1Wm5UABnAUKwwRsPFGBt4Oc9PZvGvNLwf8JOZt8Arpe
+    eY23yDovwIDiBX74NAsPVLDJj3Hh4JEExsKcjrlKf9DsCVx3ZfLqAKBuG1s/A90C
+    z2KjYHjjyPOdG1spz6BBUr+BcUxUb1nDCTa/VZD2Uv+YkLPAKJC9dNEh7628WgqI
+    ybzlaA+ufxMa6bxC6ciLUQLcx5UGIAAsAkDA6wQkOxrcY39yo4cQMNWCAPTKV1R4
+    wPkgaBxzOc8FtMiF1NoGoXBRJjgoPApmPsjCFlbMdzCM4TFy50IXxI2DPcHAv2rY
+    gghsEIeu8CAPW6ABIPYEFkOsAeaMyIz0JfGJUExBBGRIRX0IMYovWCIT1eBELNpA
+    i1vcgta8iANPCIQOghzQABl30J0tXqBla4wjFLFQxZzAUY42CIAd5OYBCuKxB2c4
+    I0b28EcrQKADgmSKB9RYyDhA4BqCxIBqrtjIMTwoFeCjYSU3KZMQAAA7
+
+BEGIN:VCALENDAR
+DCREATED:19960523T100522
+PRODID:-//Alden Roland/Hand Crafted In North Carolina//NONSGML Made By Hand//EN
+VERSION:0.3
+BEGIN:VEVENT
+START:19960523T120000
+END:19960523T130000
+SUBTYPE:PHONE CALL
+SUMMARY:VERSIT PDI PR Teleconference/Interview
+DESCRIPTION:VERSIT PDI PR Teleconference/Interview With Tom Streeter and Alden Roland
+END:VEVENT
+BEGIN:VEVENT
+START:19960523T113000
+END:19960523T115500
+SUBTYPE:LUNCH
+SUMMARY:Eat in the cafeteria today
+END:VEVENT
+END:VCALENDAR
+
+END:VCARD
+
+
+will conceptually be be represented as
+    vcard
+	VCNameProp
+	    VCFamilyNameProp=Alden
+	    VCGivenNameProp=Roland
+	VCFullNameProp=Roland H.Alden
+	....
+	
+note that
+    EMAIL;WORK;PREF;INTERNET:sf!rincon!ralden@alden.attmail.com
+will be represented as:
+	VCEmailAddress=sf!rincon!ralden@alden.attmail.com
+	    VCWork
+	    VCPreferred
+	    VCInternet
+where the lower level properties are properties of the property
+VCEmailAddress.
+
+Groupings are flattened out in the VObject representation such
+that:
+	a.b:blah
+	a.c:blahblah
+are represented as:
+	b=blah
+	    VCGrouping=a
+	c=blahblah
+	    VCGrouping=a
+i.e. one can read the above as:
+	 the property "b" has value "blah" and property "VCGrouping"
+		with the value "a".
+	 the property "c" has value "blahblah" and property "VCGrouping"
+		with the value "a".
+likewise, multi-level groupings are flatten similarly. e.g.
+	a.b.c:blah
+	a.b.e:blahblah
+-->
+	c=blah
+	    VCGrouping=b
+		VCGrouping=a
+	e=blahblah
+	    VCGrouping=b
+		VCGrouping=a
+which read:
+	 the property "c" has value "blah" and property "VCGrouping"
+		with the value "b" which has property "VCGrouping"
+		with value "a".
+	 the property "e" has value "blahblah" and property "VCGrouping"
+		with the value "b" which has property "VCGrouping"
+		with value "a".
+
+3. Iterating Through VObject's Properties or Values
+   ================================================
+The following is a skeletal form of iterating through
+all properties of a vobject, o:
+
+    // assume the object of interest, o, is of type VObject
+    VObjectIterator i;
+    initPropIterator(&i,o);
+    while (moreIteration(&i)) {
+	VObject *each = nextVObject(&i);
+	// ... do something with "each" property 
+	}
+
+Use the API vObjectName() to access a VObject's name.
+Use the API vObjectValueType() to determine if a VObject has
+	a value. For VCard/VCalendar application, you
+	should not need this function as practically
+	all values are either of type VCVT_USTRINGZ or
+	VCVT_RAW (i.e set by setVObjectUStringZValue and
+	setVObjectAnyValue APIs respectively), and the
+	value returned by calls to vObjectUStringZValue
+	and vObjectAnyValue are 0 if a VObject has no
+	value. (There is a minor exception where VObject with
+	VCDataSizeProp has value that is set by
+	setVObjectLongValue).
+Use the APIs vObject???Value() to access a VObject's value.
+	where ??? is the expected type.
+Use the APIs setvObject???Value() to set or modify a VObject's value.
+	where ??? is the expected type.
+Use the API isAPropertyOf() to query if a name match the name of
+	a property of a VObject. Since isAPropertyOf() return
+	the matching property, we can use that to retrieve
+	a property and subsequently the value of the property.
+
+4. Pretty Printing a VObject Tree
+   ==============================
+VObject tree can be pretty printed with the printVObject() function.
+The output of pretty printing a VObject representation of the input
+test file "vobject.vcf" is shown below. Note that the indentation
+indicates the tree hirerarchy where the immediate children nodes
+of a parent node is all at the same indentation level and the
+immediate children nodes are the immediate properties of the
+associated parent nodes.  In the following, {N,FN,ORG,TITLE,...}
+are immediate properties of VCARD. {F and G} are properties of N
+with value {"Alden" and "Roland"} respectively; FN has no property
+but has the value "Roland H. Alden"; EMAIL has value and
+the properties WORK, PREF, and INTERNET.
+
+
+VCARD
+    N
+        F="Alden"
+        G="Roland"
+    FN="Roland H. Alden"
+    ORG
+        ORGNAME="AT&T"
+        OUN="Versit Project Office"
+    TITLE="Consultant"
+    EMAIL="sf!rincon!ralden@alden.attmail.com"
+        WORK
+        PREF
+        INTERNET
+    EMAIL="ralden@sfgate.com"
+        INTERNET
+    EMAIL="242-2200"
+        MCIMail
+    LABEL="Roland H. Alden
+            Suite 2208
+            One Pine Street
+            San Francisco, CA 94111"
+        DOM
+        POSTAL
+        PARCEL
+        HOME
+        WORK
+        QP
+    LABEL="Roland H. Alden
+            Suite 2208
+            One Pine Street
+            San Francisco, CA 94111
+            U.S.A."
+        POSTAL
+        PARCEL
+        HOME
+        WORK
+        QP
+    TEL="+1 415 296 9106"
+        WORK
+        PREF
+        MSG
+    TEL="+1 415 296 9016"
+        WORK
+        FAX
+    TEL="+1 415 608 5981"
+        MSG
+        CELL
+    ADR
+        EXT ADD="Suite 2208"
+        STREET="One Pine Street"
+        L="San Francisco"
+        R="CA"
+        PC="94111"
+        C="U.S.A."
+    SOUND="ROW-LAND H ALL-DIN"
+    LOGO=[raw data]
+        GIF
+        BASE64
+        DataSize=1482
+VCALENDAR
+    DCREATED="19960523T100522"
+    PRODID="-//Alden Roland/Hand Crafted In North Carolina//NONSGML Made By Hand//EN"
+    VERSION="0.3"
+    VEVENT
+        START="19960523T120000"
+        END="19960523T130000"
+        SUBTYPE="PHONE CALL"
+        SUMMARY="VERSIT PDI PR Teleconference/Interview"
+        DESCRIPTION="VERSIT PDI PR Teleconference/Interview With Tom Streeter and Alden Roland"
+    VEVENT
+        START="19960523T113000"
+        END="19960523T115500"
+        SUBTYPE="LUNCH"
+        SUMMARY="Eat in the cafeteria today"
+
+5. Building A VObject Representation of A VCard/VCalendar
+   ======================================================
+The parser in vcc.y converts an input file with one or more
+VCard/VCalendar that is in their textual representation
+into their corresponding VObject representation.
+
+VObject representation of a VCard/VCalendar can also be built
+directly with calls to the VObject building APIs. e.g.
+
+	VObject *prop;
+	VObject *vcard = newVObject(VCCardProp);
+	prop = addProp(vcard,VCNameProp);
+		addPropValue(prop,VCFamilyNameProp,"Alden");
+		addPropValue(prop,VCGivenNameProp,"Roland");
+	addPropValue(vcard,VCFullNameProp,"Roland H. Alden");
+	....
+
+6. Converting A VObject Representation Into Its Textual Representation
+   ===================================================================
+The VObject representation can be converted back to its textual
+representation via the call to writeVObject() or writeMemVObject()
+API. e.g.
+   a. to write to a file:
+	// assume vcard is of type VObject
+	FILE *fp = fopen("alden.vcf","w");
+	writeVObject(fp,vcard);
+   a. to write to memory, and let the API allocate the required memory.
+	char* clipboard = writeVObject(0,0,vcard);
+	... do something to clipboard
+	free(clipboard);
+   b. to write to a user allocated buffer:
+	char clipboard[16384];
+	int len = 16384;
+	char *buf  = writeVObject(clipboard,&len,vcard);
+	... buf will be equal to clipboard if the write
+	is successful otherwise 0.
+
+In the case of writing to memory, the memory buffer can be either
+allocated by the API or the user. If the user allocate the
+memory for the buffer, then the length of the buffer needs to be
+communicated to the API via a variable. The variable passed as
+the length argument will be overwritten with the actual size
+of the text output. A 0 return value from writeMemVObject()
+indicates an error which could be caused by overflowing the
+size of the buffer or lack of heap memory.
+
+7. Miscellaneous Notes On VObject APIs usages
+   ==========================================
+a. vcc.h -- contains basic interfaces to the parser:
+    VObject* Parse_MIME(const char *input, unsigned long len);
+    VObject* Parse_MIME_FromFile(FILE *file);
+	-- both of this return a null-terminated list of
+	   VObject that is either a VCARD or VCALENDAR.
+	   To iterate through this list, do
+		VObject *t, *v;
+		v = Parse_Mime_FromFile(fp);
+		while (v) {
+		    // ... do something to v.
+		    t = v;
+		    v = nextVObjectInList(v);
+		    cleanVObject(t);
+		    }
+	    note that call to cleanVObject will release
+	    resource used to represent the VObject.
+
+b. vobject.h -- contains basic interfaces to the VObject APIs.
+	see the header for more details.
+	The structure of VObject is purposely (hiddened) not exposed
+	to the user. Every access has to be done via
+	the APIs. This way, if we need to change the
+	structure or implementation, the client need not
+	recompile as long as the interfaces remain the
+	same.
+
+c. values of a property is determined by the property definition
+	itself. The vobject APIs does not attempt to enforce
+	any of such definition. It is the consumer responsibility
+	to know what value is expected from a property. e.g
+	most properties have unicode string value, so to access
+	the value of these type of properties, you will use
+	the vObjectUStringZValue() to read the value and
+	setVObjectUStringZValue() to set or modify the value.
+	Refer to the VCard and VCalendar specifications for
+	the definition of each property.
+
+d. properties name (id) are case incensitive.
+
+8. Brief descriptions of each APIs
+   ===============================
+   * the predefined properties' names (id) are listed under vobject.h
+	each is of the form VC*Prop. e.g.
+		#define VC7bitProp		"7BIT"
+		#define VCAAlarmProp	"AALARM"
+		....
+
+   * consumer of a VObject can only define pointers to VObject.
+
+   * a variable of type VObjectIterator, say "i", can be used to iterate
+	through a VObject's properties, say "o". The APIs related to
+	VObjectIterator are:
+		void initPropIterator(VObjectIterator *i, VObject *o);
+			-- e.g. usage
+				initPropIterator(&i,o);
+		int moreIteration(VObjectIterator *i);
+			-- e.g. usage
+				while (moreIteration(&i)) { ... }
+		VObject* nextVObject(VObjectIterator *i);
+			-- e.g. usage
+				while (moreIteration(&i)) {
+				    VObject *each = nextVObject(&i);
+				    }
+
+    * VObject can be chained together to form a list. e.g. of such
+	use is in the parser where the return value of the parser is
+	a link list of VObject. A link list of VObject can be
+	built by:
+		void addList(VObject **o, VObject *p);
+	and iterated by
+		VObject* nextVObjectInList(VObject *o);
+			-- next VObjectInList return 0 if the list
+				is exhausted.
+
+    * the following APIs are mainly used to construct a VObject tree:
+	VObject* newVObject(const char *id);
+	    -- used extensively internally by VObject APIs but when
+		used externally, its use is mainly limited to the
+		construction of top level object (e.g. an object
+		with VCCardProp or VCCalendarProp id).
+	
+	void deleteVObject(VObject *p);
+	    -- to deallocate single VObject, for most user, use
+		cleanVObject(VObject *o) instead for freeing all
+		resources associated with the VObject.
+
+	char* dupStr(const char *s, unsigned int size);
+	    -- duplicate a string s. If size is 0, the string is
+		assume to be a null-terminated. 
+
+	void deleteStr(const char *p);
+	    -- used to deallocate a string allocated by dupStr();
+
+	void setVObjectName(VObject *o, const char* id);
+	    -- set the id of VObject o. This function is not
+		normally used by the user. The setting of id
+		is normally done as part of other APIs (e.g.
+		addProp()).
+
+	void setVObjectStringZValue(VObject *o, const char *s);
+	    -- set a string value of a VObject.
+
+	void setVObjectUStringZValue(VObject *o, const wchar_t *s);
+	    -- set a Unicode string value of a VObject.
+
+	void setVObjectIntegerValue(VObject *o, unsigned int i);
+	    -- set an integer value of a VObject.
+
+	void setVObjectLongValue(VObject *o, unsigned long l);
+	    -- set an long integer value of a VObject.
+
+	void setVObjectAnyValue(VObject *o, void *t);
+	    -- set any value of a VObject. The value type is
+		unspecified.
+
+	VObject* setValueWithSize(VObject *prop, void *val, unsigned int size);
+	    -- set a raw data (stream of bytes) value of a VObject
+		whose size is size. The internal VObject representation
+		is
+			this object = val
+			    VCDataSizeProp=size
+		i.e. the value val will be attached to the VObject prop
+		and a property of VCDataSize whose value is size
+		is also added to the object.
+		
+	void setVObjectVObjectValue(VObject *o, VObject *p);
+	    -- set a VObject as the value of another VObject.
+
+	const char* vObjectName(VObject *o);
+	    -- retrieve the VObject's Name (i.e. id).
+
+	const char* vObjectStringZValue(VObject *o);
+	    -- retrieve the VObject's value interpreted as
+		null-terminated string.
+
+	const wchar_t* vObjectUStringZValue(VObject *o);
+	    -- retrieve the VObject's value interpreted as
+		null-terminated unicode string.
+
+	unsigned int vObjectIntegerValue(VObject *o);
+	    -- retrieve the VObject's value interpreted as
+		integer.
+
+	unsigned long vObjectLongValue(VObject *o);
+	    -- retrieve the VObject's value interpreted as
+		long integer.
+
+	void* vObjectAnyValue(VObject *o);
+	    -- retrieve the VObject's value interpreted as
+		any value.
+
+	VObject* vObjectVObjectValue(VObject *o);
+	    -- retrieve the VObject's value interpreted as
+		a VObject.
+
+	VObject* addVObjectProp(VObject *o, VObject *p);
+	    -- add a VObject p as a property of VObject o.
+		(not normally used externally for building a
+		VObject).
+
+	VObject* addProp(VObject *o, const char *id);
+	    -- add a property whose name is id to VObject o.
+
+	VObject* addPropValue(VObject *o, const char *id, const char *v);
+	    -- add a property whose name is id and whose value
+		is a null-terminated string to VObject o.
+
+	VObject* addPropSizedValue(VObject *o, const char *id,
+			const char *v, unsigned int size);
+	    -- add a property whose name is id and whose value
+		is a stream of bytes of size size, to VObject o.
+
+	VObject* addGroup(VObject *o, const char *g);
+	    -- add a group g to VObject o.
+		e.g. if g is a.b.c, you will have
+		    o
+			c
+			   VCGroupingProp=b
+			       VCGroupingProp=a
+		and the object c is returned.
+		
+	VObject* isAPropertyOf(VObject *o, const char *id);
+	     -- query if a property by the name id is in o and
+		return the VObject that represent that property.
+
+	void printVObject(VObject *o);
+	     -- pretty print VObject o to stdout (for debugging use).
+
+	void writeVObject(FILE *fp, VObject *o);
+	     -- convert VObject o to its textual representation and
+		write it to file.
+
+	char* writeMemVObject(char *s, int *len, VObject *o);
+	     -- convert VObject o to its textual representation and
+		write it to memory. If s is 0, then memory required
+		to hold the textual representation will be allocated
+		by this API. If a variable len is passed, len will
+		be overwriten with the byte size of the textual
+		representation. If s is non-zero, then s has to
+		be a user allocated buffer whose size has be passed
+		in len as a variable. Memory allocated by the API
+		has to be freed with call to free. The return value
+		of this API is either the user supplied buffer,
+		the memory allocated by the API, or 0 (in case of
+		failure).
+
+	void cleanStrTbl();
+		-- this function has to be called when all
+		VObject has been destroyed.
+
+	void cleanVObject(VObject *o);
+		-- release all resources used by VObject o.
+
+	wchar_t* fakeUnicode(const char *ps, int *bytes);
+		-- convert char* to wchar_t*.
+
+	extern int uStrLen(const wchar_t *u);
+		-- length of unicode u.
+
+	char *fakeCString(const wchar_t *u);
+		-- convert wchar_t to CString (blindly assumes that
+		this could be done).
+
+9. Additional Programming Notes
+   ============================
+In the following notes, please refers to the listing
+of Example.vcf and its VObject Representation
+(shown at the end of this section).
+
+* Handling the Return Value of the VCard/VCalendar Parser
+    The example input text file contains two root VObjects
+    (a VCalendar and a VCard). The output of the VCard/VCalendar
+    parser is a null-terminated list of VObjects. For this
+    particular input file, the list will have two VObjects.
+    The following shows a template for iterating through the
+    output of the Parser:
+
+	VObject *t, *v;
+	v = Parse_Mime_fromFileName("example.vcf");
+	while (v) {
+	    // currently, v will either be a VCard or a VCalendar
+	    //	do whatever your application need to do to
+	    //  v here ...
+	    t = v;
+	    v = nextVObjectInList(v);
+	    cleanVObject(t);
+	    }
+
+* Iterating Through a VCard/VCalendar VObject
+    From the VObject APIs point of view, a VCard VObject
+    is the same as a VCalendar VObject. However, the application
+    needs to know what are in a VCard or a VCalendar.
+    For example, A VCalendar VObject can have VCDCreatedProp,
+    a VCGEOLocationProp, etc, and one or more VCEventProp and
+    or VCTodoProp. The VCEventProp and VCTodoProp can have
+    many properties of their own, which in turn could have
+    more properties (e.g. VCDAlarmProp can be a VCEventProp
+    VObject's property, and VCRunTimeProp can be a
+    VCDAlarmProp VObject's property. Because a VObject tree
+    can be arbitrarily complex, in general, to process all
+    properties and values of a VObject tree, a recursive walk
+    is desirable. An example recursive VObject tree walk
+    can be found in the vobject.c source lines for printVObject*
+    and writeVObject* APIs. Depending on what the application need
+    to do with a VCard or a VCalendar, a recursive walk
+    of the VObject tree may or may not be desirable. An example
+    template of a non-recursive walk is shown below:
+	
+    void processVCardVCalendar(char *inputFile)
+    {
+	VObject *t, *v;
+	v = Parse_Mime_fromFileName(inputFile);
+	while (v) {
+	    char *n = vObjectName(v);
+	    if (strcmp(n,VCCardProp) == 0) {
+		do_VCard(v);
+		}
+	    else if (strcmp(n,VCCalendarProp) == 0) {
+		do_VCalendar(v);
+		}
+	    else {
+		// don't know how to handle anything else!
+		}
+	    t = v;
+	    v = nextVObjectInList(v);
+	    cleanVObject(t);
+	    }
+    }
+
+    void  do_VCard(VObject *vcard)
+    {
+	VObjectIterator t;
+	initPropIterator(&t,vcard);
+	while (moreIteration(&t)) {
+	    VObject *eachProp = nextVObject(&t);
+	    //	The primarly purpose of this example is to
+	    //  show how to iterate through a VCard VObject,
+	    //	it is not meant to be efficient at all.
+	    char *n = vObjectName(eachProp);
+	    if (strcmp(n,VCNameProp)==0) {
+		do_name(eachProp);
+		}
+	    else if (strcmp(n,VCEmailProp)==0) {
+		do_email(eachProp);
+		}
+	    else if (strcmp(n,VCLabelProp)==0) {
+		do_label(eachProp);
+		}
+	    else if ....
+	    }
+    }
+
+    void  do_VCalendar(VObject *vcal)
+    {
+	VObjectIterator t;
+	initPropIterator(&t,vcard);
+	while (moreIteration(&t)) {
+	    VObject *eachProp = nextVObject(&t);
+	    //	The primarly purpose of this example is to
+	    //  show how to iterate through a VCalendar VObject,
+	    //	it is not meant to be efficient at all.
+	    char *n = vObjectName(eachProp);
+	    if (strcmp(n,VCDCreatedProp)==0) {
+		do_DCreated(eachProp);
+		}
+	    else if (strcmp(n,VCVersionProp)==0) {
+		do_Version(eachProp);
+		}
+	    else if (strcmp(n,VCTodoProp)==0) {
+		do_Todo(eachProp);
+		}
+	    else if (strcmp(n,VCEventProp)==0) {
+		do_Event(eachProp);
+		}
+	    else if ....
+	    }
+    }
+
+    void do_Todo(VObject *vtodo) { ... }
+
+    void do_Event(VObject *vevent) { ... }
+
+    ...
+    
+* Property's Values and Properties
+    The VObject APIs do not attempt to check for the
+    correctness of the values of a property. Nor do they
+    will prevent the user from attaching a non-VCard/VCalendar
+    standard property to a VCard/VCalendar property. Take
+    the example of line [11] of the example, "O.K" is not
+    a valid value of VCStatusProp.  It is up to the application
+    to accept or reject the value of a property.
+    
+* Output of printVObject
+    PrintVObject pretty prints a VObject tree in human
+    readable form. See the listing at the end of the file
+    for an example output of printVObject on the example
+    input file "Example.vcf".
+
+    Note that binary data are not shown in the output of
+    printVObject. Instead, a note is made ([raw data]) to
+    indicate that there exists such a binary data.
+
+* Note on Binary Data
+    When the value of a property is a binary data, it is only
+    useful to know the size of the binary data.
+
+    In the case of the VCard/VCalendar parser, it chooses
+    to represent the size information as a separate property
+    called VCDataSizeProp whose value is the size of the binary
+    data. The APIs sequence to construct the VObject subtree
+    of line [44] of Example.vcf is
+
+	    // VObject *vcard;
+	    VObject *p1 = addProp(vcard,VCLogoProp);
+	    (void) addProp(p1,VCGIFProp);
+	    (void) addProp(p1,VCBASE64Prop);
+	    VObject *p2 = addProp(p1,VCDataSizeProp);
+	    (void) setVObjectLongValue(p2,1482);
+	    setVObjectAnyValue(vcard,...pointer to binary data);
+	
+    Note the presence of VCBase64Prop will cause the
+    writeVObject API to output the binary data as BASE64 text.
+    For VCard/VCalendar application, having the VCBase64Prop
+    property is pratically always neccessary for property with
+    binary data as its value.
+	
+* Note on Quoted-Printable String
+    String value with embedded newline are written out as
+    quoted-prinatable string. It is therefore important
+    to mark a property with a string value that has
+    one or more embedded newlines, with the VCQutedPrintableProp
+    property. e.g.
+			
+	// VObject *root;
+	char *msg="To be\nor\nnot to be";
+	VObject *p = addPropValue(root,VCDescriptionProp,msg);
+	    // the following is how you mark a property with
+	    //	a property. In this case, the marker is
+	    //  VCQuotedPrintableProp
+	    addProp(p,VCQuotedPrintableProp);
+
+* Note on Unicode
+    Although, the current parser takes ASCII text file only,
+    string values are all stored as Unicode in the VObject tree.
+    For now, when using the VObject APIs to construct a
+    VObject tree, one should always convert ASCII string value
+    to a Unicode string value:
+
+	// VObject *root;
+	VObject *p = addProp(root,VCSomeProp);
+	setVObjectUStringZValue(p,fakeUnicode(someASCIIStringZvalue));
+
+    An API is provided to simplify the above process:
+
+	addPropValue(root,VCSomeProp,someASCIIStringZValue);
+
+    Note that someASCIISTringZValue is automatically converted to
+    Unicode by addPropValue API, where as, the former code
+    sequence do an explicit call to fakeUnicode.
+
+    To read back the value, one should use the vObjectUStringZValue
+    API not vObjectStringZValue API. The value returned by the
+    vObjectUStringZValue API is a Unicode string. If the application
+    do not know how to handle Unicode string, it can use the
+    fakeCString API to convert it back to ASCII string (as long
+    as the conversion is meaningful).
+
+    Note that fakeCString return a heap allocated memory. It is
+    important to call deleteStr on fakeCString return value if
+    it is not longer required (or there will be memory leak).
+
+    NOTE: Unfortunately, at the point when this document is written,
+    there is still no consensus on how Unicode is to be handled
+    in the textual representation of VCard/VCalendar. So, there
+    is no version of writeVObject and the parser to output and
+    input Unicode textual representation of VCard/VCalendar.
+   
+
+Example.vcf
+-----------
+line
+number Input Text (example.vcf)
+------ ----------
+1      BEGIN:VCALENDAR
+2      DCREATED:19961102T100522
+3      GEO:0,0
+4      VERSION:1.0
+5      BEGIN:VEVENT
+6      DTSTART:19961103T000000
+7      DTEND:20000101T000000
+8      DESCRIPTION;QUOTED-PRINTABLE:To be =0A=
+9      or =0A=
+10     not to be
+11     STATUS:O.K.
+12     X-ACTION:No action required
+13     DALARM:19961103T114500;5;3;Enjoy
+14     MALARM:19970101T120000;;;johny@nowhere.com;Call Mom.
+15     END:VEVENT
+16
+17     BEGIN:VTODO
+18     DUE:19960614T0173000
+19     DESCRIPTION:Relex.
+20     END:VTODO
+21
+22     END:VCALENDAR
+23
+24     BEGIN:VCARD
+25     N:Alden;Roland
+26     FN:Roland H. Alden
+27     ORG:AT&T;Versit Project Office
+28     TITLE:Consultant
+29     EMAIL;WORK;PREF;INTERNET:ralden@ralden.com
+30     LABEL;DOM;POSTAL;PARCEL;HOME;WORK;QUOTED-PRINTABLE:Roland H. Alden=0A=
+31     Suite 2208=0A=
+32     One Pine Street=0A=
+33     San Francisco, CA 94111
+34     LABEL;POSTAL;PARCEL;HOME;WORK;QUOTED-PRINTABLE:Roland H. Alden=0A=
+35     Suite 2208=0A=
+36     One Pine Street=0A=
+37     San Francisco, CA 94111=0A=
+38     U.S.A.
+39     TEL;WORK;PREF;MSG:+1 415 296 9106
+40     TEL;WORK;FAX:+1 415 296 9016
+41     TEL;MSG;CELL:+1 415 608 5981
+42     ADR:;Suite 2208;One Pine Street;San Francisco;CA;94111;U.S.A.
+43     SOUND:ROW-LAND H ALL-DIN
+44     LOGO;GIF;BASE64:
+45         R0lGODdhpgBOAMQAAP///+/v797e3s7Ozr29va2trZycnIyMjHt7e2NjY1JSUkJC
+    ... 30 lines of BASE64 data not shown here.
+76     END:VCARD
+
+
+VObject Representation of Example.vcf:
+-------------------------------------
+line
+in
+text
+file  VObject Tree as Printed by printVObject API
+----  -------------------------------------------
+1     VCALENDAR
+2         DCREATED="19961102T100522"
+3         GEO="0,0"
+4         VERSION="1.0"
+5         VEVENT
+6             DTSTART="19961103T000000"
+7             DTEND="20000101T000000"
+8             DESCRIPTION="To be
+9                     or
+10                    not to be"
+8                 QUOTED-PRINTABLE
+11            STATUS="O.K."
+12            X-ACTION="No action required"
+13            DALARM
+13                RUNTIME="19961103T114500"
+13                SNOOZETIME="5"
+13                REPEATCOUNT="3"
+13                DISPLAYSTRING="Enjoy"
+14            MALARM
+14                RUNTIME="19970101T120000"
+14                EMAIL="johny@nowhere.com"
+14                NOTE="Call Mom"
+17        VTODO
+18            DUE="19960614T0173000"
+19            DESCRIPTION="Relex."
+24    VCARD
+25        N
+25            F="Alden"
+25            G="Roland"
+26        FN="Roland H. Alden"
+27        ORG
+27            ORGNAME="AT&T"
+27            OUN="Versit Project Office"
+28        TITLE="Consultant"
+29        EMAIL="ralden@alden.com"
+29            WORK
+29            PREF
+29            INTERNET
+30        LABEL="Roland H. Alden
+31                Suite 2208
+32                One Pine Street
+33                San Francisco, CA 94111"
+30            DOM
+30            POSTAL
+30            PARCEL
+30            HOME
+30            WORK
+30            QUOTED-PRINTABLE
+34        LABEL="Roland H. Alden
+35                Suite 2208
+36                One Pine Street
+37                San Francisco, CA 94111
+38                U.S.A."
+34            POSTAL
+34            PARCEL
+34            HOME
+34            WORK
+34            QUOTED-PRINTABLE
+39        TEL="+1 415 296 9106"
+39            WORK
+39            PREF
+39            MSG
+40        TEL="+1 415 296 9016"
+40            WORK
+40            FAX
+41        TEL="+1 415 608 5981"
+41            MSG
+41            CELL
+42        ADR
+42            EXT ADD="Suite 2208"
+42            STREET="One Pine Street"
+42            L="San Francisco"
+42            R="CA"
+42            PC="94111"
+42            C="U.S.A."
+43        SOUND="ROW-LAND H ALL-DIN"
+44        LOGO=[raw data]
+44            GIF
+44            BASE64
+44            DATASIZE=1482
+