in embodiments , the present invention provides a preformed cornice molding corner cap for use in conjunction with a cornice molding trim strip as a part of an exterior siding installation at a corner structure provided by two mating walls . fig1 through 5 illustrate an exemplary embodiment of a cornice molding corner cap 10 for covering a cornice molding trim accessory strip at an “ outside corner ” of a structure . by “ outside corner ”, it is meant that the corner piece is shaped to cover the cornice molding on an outwardly protruding or “ outside ” corner of a structure as opposed to an inwardly formed or “ inside ” corner of a structure ( not shown ). while fig1 through 5 portray a cap for an outside corner , cornice molding corner caps of appropriate geometry to cover cornice molding trim strips at an inwardly formed corner or inside corner with many of the features and advantages of the cap for an outside corner are also contemplated . referring more specifically now to fig1 through 5 , the cornice molding corner cap 10 ( alternatively , 430 in fig1 or 1230 in fig1 d ) is of unitary ( i . e ., one - piece ) construction and with a body portion that has a top 11 and bottom 12 , a decorative exterior 13 and an interior 14 , an upper surface 15 and a lower surface 16 , first 20 and second 21 lateral edges , and upper and lower retainer flanges 23 and 26 . upper and lower retainer flanges 23 and 26 each include therebetween a horizontal receiver channel 24 and 27 extending to an interior corner 22 each retainer flange having a lip 25 and 28 . the cap includes first 17 and second 18 decorative exterior surfaces meeting at a corner 22 wherein the corner 22 extends to the interior of the body portion , the exterior surfaces being aesthetically of complementary shape and exterior finish to complement that of a cornice molding trim accessory strip 41 ( alternatively 90 , 103 , 111 , 320 , 321 , 420 , 421 , 1120 , 1121 , 1220 or 1221 referred to elsewhere herein ). the corner cap 10 also includes first 30 and second 31 interior surfaces , the profiles of which 32 and 33 are physically of complementary shape to the outer surfaces of the cornice molding trim accessory strips 41 so as to receive slidably horizontal cornice molding trim accessory strips 41 within the receiver channels 24 and 27 that extend laterally horizontal and through opposite sides of the cap 10 . in one presently preferred embodiment , the corner cap 10 has a dimension of about 2 . 6 inch between the upper and lower surfaces 15 , 16 and a dimension of about 2 inches between each given lateral edge 20 , 21 and the corner 22 measured while traveling horizontally across the upper surface 15 from the edge to the corner . fig6 discloses an assembly 40 including a cornice molding corner cap 10 engaged with a cornice molding trim accessory strip 41 . fig7 shows the assembly 40 from a different angle . the molding accessory strip 41 is assembled without fasteners while engaged horizontally slidably between and within the upper 24 and lower 27 receiver channels that open toward each other and are within the upper 23 and lower 26 retaining flanges of the cap 10 , the end 42 of the cornice molding accessory strip 41 and detailed portions of the cap within the interior 14 of the cap being shown in phantom . the molding accessory strip 41 is horizontally free without fasteners therethrough to move horizontally within and relative to the cap 10 due to environmental conditions , including but not limited to , thermal expansion and contraction , wind force and earth movement . the absence of fasteners avoids unsightly exposure thereof , as well as , avoids damage by hammer blows or screwdriver gouges , and permits ease of assembly by resiliently deflecting the flanges 23 and / or 26 of the cap 10 to widen the space between the upper and lower retaining flanges 23 , 26 , and snap fit and latch the cap 10 over the strips 41 , by resilient return of the cap 10 to its original configuration prior to resilient deflection thereof . in this embodiment , the retainer flanges 23 , 26 have a dimension of about 0 . 25 inch from upper or lower surface 15 , 16 to flange lip 25 , 28 . in some embodiments , preferably the upper and lower retainer flanges 23 , 26 are between about 0 . 1 and 0 . 4 inch in dimension , more preferably about 0 . 1 to 0 . 3 inches . this dimension provides a balance in adequate mechanically latching onto the cornice molding accessory strip 41 without interfering with the functionality of other parts of the molding accessory strip 41 , such as , for example , a mounting flange 91 ( alternatively 104 or 112 elsewhere herein ) in use with a cornice molding trim accessory strip 41 . fig8 shows a section of cornice receiver strip 80 ( alternatively 101 , 910 or 1010 elsewhere herein ) having a receiver channel 81 ( alternatively 114 , 102 , 214 , 314 , 911 or 1011 elsewhere herein ) and a fastening flange 82 . the receiver channel 81 has a retainer flange 84 for engaging a mounting flange 91 , 104 or 112 from an accessory strip , such as , a cornice molding trim accessory strip 103 , alternatively 41 , 90 , 111 , 320 , 321 , 420 , 421 , 1120 , 1121 , 1220 or 1221 , that is to be mounted to a surface by using the retainer flange 84 of the receiver strip 80 . in fig1 , the mounting flange 104 , alternatively 9 or 112 , is inserted into the receiver channel 81 by resiliently biasing the retainer flange 84 to move and widen the narrow entrance to the receiver channel 81 , followed by return movement of the retainer flange 84 due to stored spring energy to partially envelop the mounting flange 104 and interlock in place the accessory strip 103 . a ledge 85 is formed by doubling back the strip 80 at the entrance to the receiver channel 81 . the fastening flange 82 is equipped with fastening holes 83 to enable attachment to a wall by mechanical fasteners such as nails , screws , staples , rivets , snaps , hook and loop fasteners , or the like . adhesives could also be used to attach a receiver strip 80 to a wall . the fastening holes 83 are preferably elongated horizontally as shown in fig8 to accommodate thermal expansion and contraction of the strip and ease fastener placement during installation . fig9 shows a cornice molding trim accessory strip 90 having an exterior surface 92 and an exterior surface profile 93 . the exterior surface 92 and the exterior profile 93 provide aesthetic benefit to a siding installation , for example , in the transition region between the wall and a soffit or eave 108 in fig1 d . the cornice molding trim accessory strip 90 also has a mounting flange 91 ( alternatively 104 or 112 referred to elsewhere herein ) for attachment to a wall or other surface using a molding receiver strip 80 having a receiver channel 81 and a retainer flange 84 . the cornice molding trim accessory strip 90 has a projecting upper lip 94 defining an upper part of the profile 93 and an depending bottom 325 upturned at the end and providing a covering skirt or covering flange to cover and conceal an uppermost course of siding or siding panel 204 , 205 , 904 , 1005 , 1105 , 1106 , 1205 or 1206 and an uppermost part of a siding corner piece 2 - 8 , 408 , 1007 , 1107 or 1207 . the upper lip 94 may abut a soffit 1208 , fig1 d , below and against which the molding strip is installed , and / or may also provide a geometric feature to aid in the attachment of other items or accessories such as , for example , the cornice molding corner cap 10 of the present invention , to the cornice molding strip . fig1 depicts an assembly 100 in which a cornice molding trim accessory strip 103 is attached to a cornice receiver strip 101 . the receiver channel 102 of 101 receives the mounting flange 104 of 103 in a friction fit to hold the cornice molding trim accessory strip 103 in place . the retainer flange 84 biases as a resiliently deflected cantilever beam against the mounting flange 104 . subsequently , the assembly 100 is assembled with a cornice molding corner cap 10 , by snap fitting the cap 10 over the two cornice molding trim accessory strips 103 adjacent the corner . the upper retaining flange 23 is hooked onto and conforms tightly to the raised upper lip 94 of each accessory strip 103 and is wedged between the upper lip 94 and the doubled back flange 85 above the entrance to the receiver channel 102 . the corner cap 10 is present to cover a portion of the raised upper lip 94 without entering the receiver channel 102 to interfere with or distort the cornice receiver strip 101 or the f - channel cornice receiver strip 113 , fig1 , whichever is used . where the cap 10 is not present , the lip 94 is biased against the flange 85 by the inherent bias and friction fit of the mounting flange 104 and the retainer flange 84 . thus the thickness of the upper retaining flange 23 on the corner cap 10 has a thickness that is readily covered by the lip 94 without opening the lip 94 to form a gap behind the lip 94 . the flange 26 at the bottom 12 of the cap 10 snap fits over the bottom 325 or 327 of the corresponding cornice molding trim accessory strip 320 or 321 and wedges between the bottom 325 or 327 and an uppermost course of siding panel described hereafter with reference to 204 , 205 , 904 , 1005 , 1006 , 1205 or 1206 and between the bottom 325 or 327 and an uppermost course of siding corner piece described hereafter with reference to 208 , 408 , 1007 , 1107 or 1207 . in the absence of the corner cap 10 the bottom 325 or 327 is turned inward with a rounded chamfer to emulate a chamfered trim board when viewed . the bottom 325 or 327 is biased by inherent cantilever beam resiliency in the strip 320 or 321 to engage the uppermost courses of siding panel and siding corner piece , and the bottom 325 or 327 is flexible to conform against surface dimension irregularities without causing a visibly noticeable gap . accordingly , the thickness of the lower retaining flange 26 is sufficiently thin for being readily covered and conformed against by the bottom 325 or 327 without opening the bottom 325 or 327 to form a visibly noticeable gap behind the bottom 325 or 327 . fig1 depicts an assembly 110 in which a cornice molding trim accessory strip 111 is attached to an f - channel cornice receiver strip 113 ( alternatively 211 , 212 , 311 or 312 elsewhere herein ). the f - channel strip is equipped with a soffit receiver pocket 115 that serves to receive a soffit panel of a soffit 1208 , fig1 d , above the cornice molding trimmed siding installation . the receiver channel 114 of the f - channel cornice receiver strip 113 receives the mounting flange 112 in a friction fit to interlock and hold the cornice molding trim accessory strip 111 in place . except for having the f - channel receiver strip 113 the f - channel cornice receiver strip 113 has the same features as the cornice receiver strip 80 ( alternatively 101 , 910 and 110 elsewhere herein ). the cap 10 is subsequently assembled to the assembly 110 similarly as described with reference to fig1 wherein the cap 10 is assembled to the assembly 100 . the features of the cap 10 in the assembly 100 similarly apply to the assembly 110 . fig1 to 14 show there are sequential steps in the installation and placement of a cornice molding corner cap of the present invention on a wall . in fig1 , an assembly 200 is presented including siding panels , siding corner pieces and cornice molding retainer strips . a first wall 201 and a second wall 202 meet at a corner structure 203 having a corner structure edge 210 . an uppermost course of siding panels 204 on the first wall 201 and an uppermost course of siding panels 205 on the second wall 202 are shown in phantom under a siding corner piece 208 . the first uppermost course 204 has an upper edge 206 and the second uppermost course 205 has an upper edge 207 . the ends of the phantom siding panels 204 , 205 are covered by siding corner piece 208 , the corner piece having an upper edge 209 . first and second cornice receiver strips 211 and 212 , each having a soffit receiver pocket 213 and a cornice receiver channel 214 , are attached to the first and second walls 201 , 202 by fasteners 215 . the cornice receiver strip is preferably spaced above the upper edge of the siding panels 206 , 207 by a gap of about 0 . 25 inch . the ends of the cornice molding receiver strips 221 , 222 are spaced slightly back from the edge 210 of the corner structure 203 . this spacing allows for dimensional changes that may occur in the strips in use . a preferred spacing of the ends of the receiver strips 221 , 222 from the edge 210 is about 0 . 25 inch . spacing of the ends from the edge could be greater , however , if desired , as long as there is a sufficient length of receiver strip mounted on the wall to retain a subsequently applied molding strip in place . in fig1 , an assembly 300 is presented similarly to assembly 200 of fig1 , but with the addition of having had cornice molding strips 320 , 321 installed into cornice receiver channels 314 to mount the cornice molding accessory strips to the walls 301 , 302 . the first wall 301 and the second wall 302 meet at a corner structure 303 having a corner structure edge 310 . an uppermost course of siding panels 304 on the first wall 301 and an uppermost course of siding panels 305 on the second wall 302 are shown in phantom . the first uppermost course 304 has an upper edge and the second uppermost course 305 has an upper edge , the upper edges being not shown as they are covered by the cornice molding strip . the ends of the phantom siding panels 304 , 305 are covered by the uppermost course of siding corner piece 308 , the corner piece having an upper edge that is also concealed by the cornice molding strip . first and second cornice receivers 311 and 312 , each having a cornice receiver channel 314 , are attached to the first and second walls 301 , 302 by fasteners which are not shown , as they , too , are concealed by the cornice molding accessory trim strip . the cornice molding strips 320 , 321 are installed by being snapped into the receiver channels 314 of the receiver strips 311 , 312 . the cornice molding accessory strips each have a top 324 , 326 , a bottom 325 , 327 and ends 330 , 331 , respectively . the ends of the cornice molding receiver strips 314 and the ends 330 , 331 of the cornice molding accessory strips 320 , 321 are spaced slightly back from the edge 310 of the corner structure 303 . the ends of the two molding strips 330 , 331 have a gap 322 between them and the molding strips have a gap 323 between each end 330 , 331 and the edge 310 of the corner structure 303 . this spacing allows for dimensional changes that may occur in the strips in use . a preferred spacing of the ends of the receiver strips 311 , 312 and the molding strips 320 , 321 from the edge 310 is about 0 . 25 inch . spacing of the ends of the molding strips 320 , 321 from the edge 310 could be greater , however , if desired , as long as there is a sufficient length of cornice molding strip mounted on the wall at the corner to enter the receiver channels to be engaged by the retainer flanges 23 , 26 of a subsequently applied cornice molding corner cap 10 and to hold the cap 10 in place in place . fig1 shows assembly 400 , including first and second walls 401 , 402 that mate in a corner structure 403 having an edge 410 . first and second cornice molding strips 420 , 421 are mounted on the walls covering an upper edge of a siding corner piece 408 . a cornice molding corner cap 430 of the present invention is installed at the corner covering the ends of the cornice molding strips 420 , 421 and the upper edge of the siding corner piece 408 . the cornice cap 430 is installed by hooking the top of the cornice cap 430 over the end of the cornice molding strips 420 , 421 and pivoting the lower flanges 26 to engage and bias against the strips 420 , 421 and snapping the bottom 12 into place . alternatively , the cap 430 is installed by sliding the cap 430 over the end of the first of the cornice molding strips 420 or 421 until the second of cornice molding strips 420 or 421 is aligned with the receiver channel of the cap 430 , and followed by inserting the second cornice molding strip 420 or 421 into the cap 430 by biasing apart the upper and lower flanges 23 , 26 against the second cornice molding strip 420 or 421 and snap fitting the cap 430 onto and over the second cornice molding strip 420 or 421 . further details of the cap 430 will be described with reference to the cap 1230 in fig1 d . another assembly 900 is shown in fig1 a , in which a first wall 901 and a second 902 wall meet at a corner structure edge 903 . an uppermost course of siding panel 904 , the panel having an end edge 905 and a top edge 906 , is attached to the second wall 902 by a fastener 908 through fastener hole 907 . a cornice receiver 910 having a receiver channel 911 is attached to the wall 902 above the siding panel 904 . in finishing the upper edge 906 of uppermost course of siding 904 , the upper edge is trimmed for appropriate fit on the wall below the soffit area . a nail slot punch can be used to punch nail slots about 0 . 25 inch from the trimmed edge 905 of the siding panel so as to enable fastening of the panel to the wall in the case where the height of the top of the wall does not coincide with an integral number of courses of siding panel . such nail slots are necessary for fastening when a preformed nail hem has been trimmed from the upper edge 906 of the panel 904 . the end edge 905 of the panel will later be concealed under a siding corner piece in completing the installation . the cornice receiver 910 is preferably spaced about 0 . 25 inch above the top edge 906 of the uppermost course of siding panels 904 . in fig1 b , the next step of finishing of a siding corner installation is shown as assembly 1000 . first and second walls 1001 , 1002 meet at a corner structure edge 1003 . uppermost course of siding 1005 is attached to the first wall 1001 and uppermost course of siding 1006 is attached to the second wall 1002 . an uppermost siding corner piece 1007 is mounted on the corner , concealing the ends of the siding panels 1005 , 1006 . cornice receiver strips 1010 having receiver channels 1011 are mounted on the wall at a position above the top edge of the uppermost courses of siding such that the ends 1012 of the cornice receiver strips are recessed or spaced slightly away from the corner structure edge 1003 . the receiver strips are attached by fasteners 1014 through fastener holes 1013 . spacing of the receiver strips is preferably about 0 . 25 inch above the top edge of the siding panels . the spacing of the receiver strip ends 1012 away from the corner edge 1003 is preferably also about 0 . 25 . in fig1 c , the resulting assembly 1100 of a further step in the finishing of a corner is presented . adjacent a corner structure edge 1103 are provided an uppermost siding course 1105 on a first wall and an uppermost course of siding 1106 on a second wall , each course having a terminal end proximate to the corner structure edge , and having the terminal ends covered and concealed by an uppermost siding corner piece 1107 . the cornice receiver strips of fig1 b have been covered by cornice molding strips 1120 , 1121 , each molding strip having an end 1122 , 1123 near the corner structure edge 1103 . the cornice molding strips are retained without fasteners and horizontally slidable in receiver channels of receiver strips analogously to the representation of fig1 into which the mounting flange of the molding strips were snapped . there is a gap 1125 between each cornice molding strip end and the corner structure edge . the gap allows for horizontal thermal expansion and contraction of the cornice molding strips during use without the possibility of contact or interaction of the ends with each other and without restraint by fasteners therethrough , either of which could result in distortion or buckling of the molding strips . the gap also allows for ease and speed of installation , as the length of the molding strip near the edge of the wall does not need to be as precise as in the case of the forming of a fine structure such as a mitered corner of the molding strip itself . the gap is preferably on the order of about 0 . 25 inch , but could vary to the extent that once a cornice molding corner cap ( not shown in 15 c ) is installed , a sufficient portion of each of the molding strip ends 1122 , 1123 is contained within the cap to hold the cap in place . in the assembly 1200 of fig1 d , the cornice molding corner cap 1230 is in place at a wall corner covering the gap between the ends of two cornice molding strips 1220 , 1221 mounted on walls clad with uppermost courses of siding 1205 , 1206 and a siding corner piece 1207 . the molding strips 1220 , 1221 and corner cap 1230 cover the uppermost edges of the siding panels 1205 , 1206 and siding corner piece 1207 to create a finished wall corner . the cornice molding corner cap 1230 has an aesthetic aspect complementary to the cornice molding strips 1220 , 1221 . further , the cap 1230 is installed as described with reference to the cap 430 in fig1 , such that the body portion of the cap 1230 is in front of and concealing respective ends 1122 , 1123 of the cornice molding trim accessory strips 1220 , 1221 , while the respective ends 1122 , 1123 are spaced apart from each other at the interior corner 22 of the body portion of the cap 1230 to allow for said expansion and contraction without engaging each other and without abutting the interior corner 22 . further , in the cap 1230 the upper retainer flanges 23 are horizontally aligned with each other , and the lower retainer flanges 26 are horizontally aligned with each other , such that they interlock with and hold the cornice molding trim accessory strips 1220 , 1221 in horizontal alignment with each other and in horizontal alignment against a soffit 1208 , fig1 d , over the passage of time to retain an aesthetic appearance , as well as a barrier to weather conditions . further , the horizontally aligned flanges 23 and 26 will bias the ends of the molding trim accessory strips 1220 , 1221 into horizontal alignment with each other when they have been installed slightly out of alignment . fig1 d discloses an exemplary soffit 1208 against which the cap 1230 and cornice molding trim accessory strips 1220 , 1221 abut . the soffit receiver pocket 115 or 213 of an f - channel cornice receiver strip 113 , 211 , 212 , 311 or 312 receives a rear edge ( not shown ) of the soffit 1208 . the cap 1230 has a top 11 of sufficiently thin thickness to conform closely to the surface of the lip 94 such that the top 11 wedges between the lip 94 and the soffit 1208 without opening a visibly noticeable gap between the lip 94 and the soffit 1208 . the cornice molding corner caps 10 , 430 , 1230 of the present invention , in addition to providing aesthetic beauty to an architectural structure , have further functional attributes . the cap is easy to handle and easy to install as a substitute for constructing a finished corner on horizontal ends of the cornice molding made by assembling the cornice receiver strips and the cornice molding trim accessory strips . further , the cap avoids the need for fasteners at the corner , and solves a problem of how to allow for thermal expansion and contraction of a cornice molding at a corner thereof . the cap , because it is preformed , simplifies the process of finishing corner trim applications . the level of precision of trimming and carpentry work required at the end of a trim strip at a building corner is reduced as the ends of the trim pieces are covered by the corner cap . caps of the invention can be easily hooked or snapped over the terminal ends of molding strips at the corner of a structure to attain a finished look . the cap also serves the purpose of closing the cladding on a building structure . the gap at the end of trim strips is effectively covered . this covering prevents or reduces entry of insects and infiltration of water through the gap in the trim strip ends at the edge of a wall having an otherwise more open structure . the receiver channels in the cap allow the cornice molding strips to move freely to expand and contract as necessary with environmental changes such as thermal fluctuations or changes in humidity . the cap also should resist displacement or dislodgement by forces to which it may be exposed . in windy areas , the cap should remain in place . the cap should not be easily removed or disconnected from the structure unintentionally by impacts . to test the resistance to displacement , a cornice cap of the invention was mounted on cornice molding strips attached to a wall by an f - channel receiver strips nailed to a pair of strandboard walls having a 90 degree outside corner . the cornice molding strip was cornice molding , product code 55807 , available from certainteed corporation , valley forge , pa . the receiver strip was deluxe f - channel , product code 52503 , available from certainteed corporation , valley forge , pa . these experiments will now be described as examples 1 , 2 and 3 . the same cornice molding strips and receiver strips were used in each of the examples . the experiments were carried out at ambient temperatures . these examples are provided to better disclose and teach articles and methods of the present invention . they are for illustrative purposes only , and it must be acknowledged that minor variations and changes can be made without materially affecting the spirit and scope of the invention as described herein . in a first trial , a force gauge with a hook was used to pull the cornice molding , in the absence of a cornice molding corner cap , from the receiver until the molding was dislodged from the receiver . the pulling force was directed perpendicularly away from the wall near the end of the molding strip . the force was measured to remove the molding from the receiver channel . in a second trial , a cornice molding corner cap of the present invention was installed over cornice molding accessory strips mounted to the wall using f - channel receiver strips nailed to the wall . a pushing force was imposed against the cornice molding corner cap at a lateral edge of the cap adjacent to one of the molding strips in a direction parallel to a first molding strip toward the end of the molding strip covered by the cap . the force was applied to the cap until either the cap was dislodged or the second molding strip , perpendicular to the direction of the applied force , was forced out of the receiver strip . a force transducer was used to measure the imposed force through the course of the test . fig1 and 16 b depict the test in progress with assembly 500 , fig1 b being slightly later during the test than fig1 . a first cornice molding strip 501 was mounted on the wall by receiver strip 504 . second cornice molding strip 502 was mounted on the adjacent wall around the corner by receiver strip 507 . cornice molding corner cap 503 was installed in place over the ends of the two cornice molding strips 501 , 502 . force transducer 505 was placed in contact with the edge of the corner cap and pushed in a direction indicated by the arrow 506 . the force was applied until the cornice molding strip 502 was dislodged from its receiver strip 507 resulting in the separation gap 508 . in a third trial , a cornice molding corner cap of the present invention was installed over cornice molding accessory strips mounted to the wall using f - channel receiver strips nailed to the wall . a pulling force was imposed on the cornice molding corner cap using a force gauge with a hook fixture attached to the end of the force probe . the fixture was hooked over the top of the cap at the corner to engage a force on the cap . the force was imposed along an angle bisecting the legs of the corner and directly away from the wall . that is to say , the force was directed at an angle of 135 degrees from each of the two walls and in the same plane as the mounting of the two molding strips on the surface of the wall . the force was applied to the cap until either the cap was dislodged or at least one of the molding strips was forced out of its respective receiver strip . fig1 and 17 b depict the test in progress with assembly 600 , fig1 b being slightly later during the test than fig1 . first and second cornice molding strips 601 , 602 were mounted on an outside wall corner 612 having a first wall 610 and a second wall 611 , the walls having a 90 degree angle between the two walls at the corner 612 , by receiver strips 604 . cornice molding corner cap 603 was installed in place over the ends of the two cornice molding strips 601 , 602 . force transducer 605 was equipped with hook fixture that was hooked around the top edge of the cap and pulled in a direction indicated by the arrow 606 . the force was applied until the cornice molding strips 601 , 602 were dislodged from their receiver strips 607 resulting in a separation gap between the molding strips and the wall . the results of the testing of examples 1 through 3 are reported in the table below . the results provided in table 1 show the estimated forces to dislodge either a cornice molding corner cap or a cornice molding strip . the results shown in table 1 show that once the corner cap is installed , the corner cap is more resistant to displacement than the cornice molding strip itself under application of direct force in either a lateral pushing or pulling mode . also , when the cornice molding corner cap is in place , it is more difficult to disengage the cornice molding strip from its receiver . the presence of the corner cap provides a more stable mechanical attachment means for the molding strip to the wall , resulting in a more stable trim application . subsequent tests for blow off resistance under simulated high wind conditions were satisfactory for trim installations employing the cornice molding corner cap of the present invention . some dimensional aspects may be helpful in understanding the present invention . while the embodiment portrayed in a number of the figures has a height of about 2 . 6 inches and an upper face width of about 2 inches , other sizes are useful in accommodating cornice molding trims of various dimensions . also , the retainer flange dimension requirements , some examples of which have been previously noted , will vary to adapt to the cornice molding strip configuration employed in an assembly , as well as to accommodate differences in flexural modulus of various materials that may be employed in producing the cornice molding corner caps of the present invention . in some embodiments , preferably the upper and lower retainer flanges 23 , 26 are between about 0 . 05 and 0 . 5 inch in dimension , more preferably about 0 . 1 to 0 . 3 inches . with respect to thickness of the wall of the corner cap , in one especially preferred embodiment , the thickness of the shell of the main body corner cap is about 0 . 08 inch as measured at a lateral edge 20 , although some embodiments may have a shell thickness in the range from about 0 . 01 inch to about 0 . 3 inch , more preferably from about 0 . 04 to about 0 . 1 inches . thicker shells employ more material can be difficult to flex during installation of the cap . thinner shells can be more fragile , and more susceptible to damage during handling or in use . visual aspects of the molding cap are also important in producing particularly aesthetically appealing embodiments . for example , it is preferred that the gloss be moderately low , so as to avoid excessive sheen or shiny spots when viewing the part at natural viewing angles . it is preferred the gloss be between 5 and 40 measured at 60 degrees , more preferably between 10 and 30 , and even more preferably about 20 . both gloss and color should be such that the appearance of the molding cap is aesthetically pleasing when used in combination with a cornice molding strip , the molding strip having its own gloss and color attributes . presently preferred materials useful for producing or manufacturing of the cornice molding corner caps are thermoplastic polymers , although thermoset polymers could be employed . particularly preferred thermoplastics include polyvinyl chloride ( pvc ) polymers and copolymers , polypropylene ( pp ) polymers and copolymers , polyethylene polymers and copolymers , acrylonitrile butadiene styrene ( abs ) copolymers , acrylonitrile styrene acrylate ( asa ) copolymers , acrylonitrile / ethylene - propylene - diene monomer ( epdm ) rubber / styrene ( aes ) copolymers , and mixtures thereof . pvc , pp and asa polymers are especially preferred , asa based polymers even more so for darker colored articles , for example articles having a color with a value of l * in the 1976 cie l * a * b * color scale of less than about 50 . polymer composite materials such as pvc or polyolefin polymers or copolymers filled with wood fiber or flour or a cellulose based fiber may also be employed in corner caps of the present invention . in some embodiments , it is desirable to use a first material having good weatherability as an outer layer on the exterior surface of the corner cap and a second material of lesser durability or weatherability , but providing a balance of more favorable economics or bulk material properties as the main portion of the corner cap body , disposed so as to be protected from the elements by the outer layer . as an example , some embodiments may employ a capstock of an asa or aes based polymer over a core based on pvc polymers . another exemplary approach would be to use a core formulated with a polymer having less expensive fillers and a capstock formulated with higher levels of light stabilizers and antioxidants . recycled materials could be employed in part , or in whole , for such a main portion . organic or inorganic coatings may also be useful for protective and / or decorative purposes as an outer layer of the corner cap . such outer layers may be uniform in color or texture or may have variations or variegations for aesthetic effect . other components useful in producing the corner caps are known in the art such as flow aids , modifiers , heat stabilizers , antioxidants , light stabilizers , colorants , pigments , fillers and the like . colorants include both pigments and dyes . light stabilizers include hindered amines and antioxidants include hindered phenols . a variety of processes can be used to produce cornice molding corner caps of the present invention . these processes include typical ways of forming polymer materials into three dimensional shapes . such processes include molding , forming , extrusion , coextrusion , compression molding , stamping , vacuum forming , injection molding , coinjection molding , casting , coating , foaming and the like , injection molding and vacuum forming being particularly preferred . combinations of one or more of the aforementioned processes could also be employed , such as , for example , extrusion or coextrusion followed by vacuum forming or compression molding . foaming could be with conventional blowing agents , such as chemical or physical blowing agents , or could be a microcellular foaming . it will be understood that although the elements shown in the figures are relatively plain - surfaced , they may be shaped and decorated in any desired manner consistent with their interrelational functioning as described herein . such decorations could include colors , appliqués , beveling , molding , shaping and the like , or other aesthetic treatments . it will also be understood that by inverting the face of the structure through a symmetry plane transecting the corner of the cornice molding corner cap , an inside corner may be produced . that is to say that the angle between the decorative exterior faces of the corner cap could be about 90 degrees , rather than the approximately 270 degree angle shown in some of the figures included with this specification . in such an inside corner cap , the angle between the inside faces of the cap could be about 270 degrees as compared with the angle shown in some of the drawings being about 90 degrees . an inside corner could involve an angle of 90 degrees , or some other angle as desired for matching architectural detail , for example , having a larger angular sweep in a bay window area application , or a smaller angular sweep in an acute angular architectural detail . similarly , the angle of an outside corner piece according to the invention could take on a range of values to accommodate architectural features encountered in a building structure . various other modifications can be made in the details of the various embodiments of the processes , compositions and articles of the present invention , all within the scope and spirit of the invention . this description of the exemplary embodiments is intended to be read in connection with the accompanying drawings , which are to be considered part of the entire written description . in the description , relative terms such as “ lower ,” “ upper ,” “ horizontal ,” “ vertical ,”, “ above ,” “ below ,” “ up ,” “ down ,” “ top ” and “ bottom ” as well as derivative thereof ( e . g ., “ horizontally ,” “ downwardly ,” “ upwardly ,” etc .) should be construed to refer to the orientation as then described or as shown in the drawing under discussion . these relative terms are for convenience of description and do not require that the apparatus be constructed or operated in a particular orientation . terms concerning attachments , coupling and the like , such as “ connected ” and “ interconnected ,” refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures , as well as both movable or rigid attachments or relationships , unless expressly described otherwise . although the invention has been described in terms of exemplary embodiments , it is not limited thereto . rather , the appended claims should be construed broadly , to include other variants and embodiments of the invention , which may be made by those skilled in the art without departing from the scope and range of equivalents of the invention .