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#!F-adobe-helvetica-medium-r-normal--18*
#!N 
#!CNavyBlue #!N  #!Rinvdata Invalid 
Data #!N #!EC #!N #!N In order to support the elimination 
of unwanted items from a data set, positions, connections, faces, or 
polylines in a Field can be "invalidated" by placing a corresponding 
"invalid positions," "invalid connections," "invalid faces," or "invalid polylines" component in 
that Field. An "invalid" component lists the individual data items of 
the positions, connections, faces, or polylines component that are invalid. #!N 
#!N In position-, connection-, face-, and polyline-dependent components, data items that 
correspond to invalid elements are themselves invalid. Data may be invalidated 
by modifying (or creating, if necessary) these invalid components. If no 
invalid component exists, all data items are assumed to be valid. 
#!N #!N An invalid component is represented by one of two 
types of Array: #!N #!I0 #!N  #!F-adobe-times-medium-r-normal--18*   #!N #!N #!I30 #!N 
1. An Array of length equal to the length of the 
"positions," "connections," "faces," or "polylines" component. This component has the "dep" 
attribute of "positions," "connections," "faces," or "polylines" (i.e., the elements correspond 
one-to-one with the elements in the applicable Array). The Array is 
either  #!F-adobe-times-bold-r-normal--18*   TYPE_BYTE #!EF or  #!F-adobe-times-bold-r-normal--18*   TYPE_UBYTE #!EF ; its valid 
elements have a value of  #!F-adobe-times-bold-r-normal--18*   DATA_VALID #!EF (0), invalid elements 
a value of  #!F-adobe-times-bold-r-normal--18*   DATA_INVALID #!EF (1). #!N #!I30 #!N 2. 
An Array of length equal to the number of invalid members 
of the applicable component. This component has the "ref" attribute of 
"positions," "connections," "faces," or "polylines." The Array is either  #!F-adobe-times-bold-r-normal--18*   TYPE_INT 
#!EF or  #!F-adobe-times-bold-r-normal--18*   TYPE_UINT #!EF , and the indices of the 
invalid members are listed. #!N #!I0 #!N #!EF #!N #!N #!N 
If many elements of the component are invalid, the first type 
of Array is preferable. If only a few elements are invalid, 
the second is preferable. #!N #!N The routines described here simplify 
the handling of both types of invalid component. #!N #!N Once 
positions have been invalidated, their immediate connections, faces, or polylines can 
also be invalidated by calling  #!F-adobe-times-bold-r-normal--18*   DXInvalidateConnections() #!EF , which will 
create an "invalid connections," "invalid faces," or "invalid polylines" component if 
necessary. (Note that this component cannot be assumed to be up-to-date 
unless this routine is called.) #!N #!N Invalid positions, connections, faces, 
and polylines (and their dependent information) can be removed from the 
data set by calling  #!F-adobe-times-bold-r-normal--18*   DXCull() #!EF . This routine: #!N 
#!I0 #!N  #!F-adobe-times-medium-r-normal--18*   #!N #!N #!I30 #!N o Removes all invalidated 
elements and the corresponding elements of components that are dependent on 
invalidated elements. #!N #!I30 #!N o Renumbers components that reference positions, 
connections, faces, and polylines (inserting a -1 for indices that refer 
to removed positions, connections, faces, and polylines). #!N #!I30 #!N o 
Removes invalid positions, invalid connections, invalid faces, and invalid polylines components. 
#!N #!I0 #!N #!EF #!N #!N #!N Removal of invalid components 
may affect system performance significantly if it requires the conversion of 
regular positions and connections components to irregular form (i.e., by greatly 
increasing the memory used for these components). For example,  #!F-adobe-times-bold-r-normal--18*   DXCreateInvalidComponentHandle() 
#!EF creates a "handle" for a specified invalid component. Other routines 
set particular elements as valid or invalid or they determine the 
validity of a given element. The module writer can set up 
a handle to mark elements as either valid or invalid (e.g., 
initializing all elements to invalid and validating the appropriate elements or 
vice versa). #!N #!N When the time comes to create an 
invalid-component Array, the information stored in the handle is used to 
create one of the two kinds of Array just described, depending 
on the relative number of invalid elements. Note: Before adding a 
new invalid component to a Field, it is important to explicitly 
remove any invalid component having the same name. The reason for 
this requirement is that the attributes of an existing component will 
be copied to the new component. Overwriting a "dep" invalid component 
with a "ref" invalid component will result in a component with 
 #!F-adobe-times-medium-i-normal--18*   both #!EF attributes, which is self-contradictory. #!CForestGreen #!N #!N  #!F-adobe-courier-bold-r-normal--18*   
#!N #define DATA_VALID 0 #!N #define DATA_INVALID 1 #!EF #!N #!N 
#!EC #!N #!I0 #!N #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   Object DXInvalidateConnections() 
#!EF #!EF #!I50 #!N Propagates the invalidity of positions. See  #!Ldxic,dxall1285 h DXInvalidateConnections  #!EL  
. #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   Object DXInvalidateDupBoundary() #!EF #!EF #!I50 
#!N Invalidates all but one of the positions shared between partitions 
in a Composite Field. See  #!Ldxidb,dxall1286 h DXInvalidateDupBoundary  #!EL  . #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*   
 #!F-adobe-times-bold-r-normal--18*   Object DXInvalidateUnreferencedPositions() #!EF #!EF #!I50 #!N Determines which positions in 
the Fields of the input Object are not referenced by any 
connections element and invalidates them. See  #!Ldxiup,dxall1287 h DXInvalidateUnreferencedPositions  #!EL  . #!N #!I0 #!N 
 #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   Object DXCull() #!EF #!EF #!I50 #!N Removes invalid positions 
and connections (and their dependent information) from an Object. See  #!Ldxcul,dxall1193 h DXCull  #!EL  
. #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   InvalidComponentHandle DXCreateInvalidComponentHandle() #!EF #!EF #!I50 
#!N Creates an invalid-component handle. See  #!Lun9,dxall1119 h Examples  #!EL  . See  #!Ldxcich,dxall1191 h DXCreateInvalidComponentHandle  #!EL  . 
#!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   Error DXFreeInvalidComponentHandle() #!EF #!EF #!I50 #!N 
Frees all memory associated with an invalid-component handle. See  #!Ldxfich,dxall1215 h DXFreeInvalidComponentHandle  #!EL  . 
#!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   Error DXSaveInvalidComponent() #!EF #!EF #!I50 #!N 
Creates a new invalid-component Array containing the information stored in an 
invalid-component handle and stores it in a given Field. See  #!Lun9,dxall1119 h Examples  #!EL  
. See  #!Ldxsic,dxall1363 h DXSaveInvalidComponent  #!EL  . #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   Array DXGetInvalidComponentArray() 
#!EF #!EF #!I50 #!N Returns an Array containing the information stored 
in an invalid-component handle. See  #!Ldxgica,dxall1243 h DXGetInvalidComponentArray  #!EL  . #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*   
 #!F-adobe-times-bold-r-normal--18*   Error DXSetElementValid() #!EF #!EF #!I50 #!N Sets the validity state 
of a specified element in an invalid-component handle to  #!F-adobe-times-bold-r-normal--18*   DATA_VALID 
#!EF . See  #!Ldxsev,dxall1375 h DXSetElementValid  #!EL  . #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   Error 
DXSetElementInvalid() #!EF #!EF #!I50 #!N Sets the validity state of a 
specified element in an invalid-component handle to  #!F-adobe-times-bold-r-normal--18*   DATA_INVALID #!EF . 
See  #!Lun9,dxall1119 h Examples  #!EL  . See  #!Ldxsei,dxall1374 h DXSetElementInvalid  #!EL  . #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   
int DXIsElementValid() #!EF #!N int DXIsElementInvalid(); #!EF #!I50 #!N Return the 
validity state of a specified element of an invalid-component handle. See 
 #!Lun9,dxall1119 h Examples  #!EL  . See  #!Ldxiev,dxall1289 h DXIsElementValid, DXIsElementInvalid  #!EL  . #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   int 
DXIsElementValidSequential() #!EF #!N int DXIsElementInvalidSequential(); #!EF #!I50 #!N Return the validity 
state of a specified element of an invalid-component handle when the 
queries come in sequential order. See  #!Ldxievs,dxall1290 h DXIsElementValidSequential, DXIsElementInvalidSequential  #!EL  . #!N #!I0 #!N 
 #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   int DXGetValidCount() #!EF #!EF #!I50 #!N Returns the number 
of valid elements in an invalid-component handle. See  #!Ldxgvc,dxall1271 h DXGetValidCount  #!EL  . #!N 
#!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   int DXGetInvalidCount() #!EF #!EF #!I50 #!N Returns 
the number of invalid elements in an invalid-component handle. See  #!Ldxgic,dxall1244 h DXGetInvalidCount  #!EL  
. #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   Error DXSetAllValid() #!EF #!EF #!I50 
#!N Sets all elements valid. See  #!Ldxsav,dxall1366 h DXSetAllValid  #!EL  . #!N #!I0 #!N 
 #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   Error DXSetAllInvalid() #!EF #!EF #!I50 #!N Sets all elements 
invalid. See  #!Lun9,dxall1119 h Examples  #!EL  . See  #!Ldxsai,dxall1365 h DXSetAllInvalid  #!EL  . #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*   
 #!F-adobe-times-bold-r-normal--18*   Error DXInvertValidity() #!EF #!EF #!I50 #!N Reverses the validity state 
of every element in a specified invalid-component handle. See  #!Ldxiv,dxall1288 h DXInvertValidity  #!EL  . 
#!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   Error DXInitGetNextInvalidElementIndex() #!EF #!N Error DXInitGetNextValidElementIndex(); 
#!EF #!I50 #!N Prepare an invalid-component handle for iteration through the 
invalid or valid elements. See  #!Ldxignie,dxall1281 h DXInitGetNextInvalidElementIndex, DXInitGetNextValidElementIndex  #!EL  . #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*   
 #!F-adobe-times-bold-r-normal--18*   int DXGetNextInvalidElementIndex() #!EF #!EF #!I50 #!N Returns the index of 
the next invalid element after the index returned on the previous 
call. See  #!Ldxgniei,dxall1252 h DXGetNextInvalidElementIndex  #!EL  . #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*    #!F-adobe-times-bold-r-normal--18*   int DXGetNextValidElementIndex() 
#!EF #!EF #!I50 #!N Returns the index of the next valid 
element after the index returned on the previous call. See  #!Ldxgnvei,dxall1253 h DXGetNextValidElementIndex  #!EL  
. #!I0 #!N #!N #!N #!N #!N  #!F-adobe-times-medium-i-normal--18*   Next Topic #!EF 
#!N #!N  #!Lun9,dxall1119 h Examples  #!EL  #!N  #!F-adobe-times-medium-i-normal--18*   #!N 