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Industrial Pressure SwitchesTypes XML and XMLEGeneral Description

215/98 1998 Square D All Rights Reserved

GENERAL DESCRIPTION

Type XML

Type XML is an electromechanical pressure and vacuum switch which meets IEC and CENELEC

standards as well as UL, CSA and CE.

Adjustable differential (XMLB) and fixed differential (XMLA)

Range listed is on increasing pressure

External pressure setting window available

1 NO - 1 NC snap acting contact standard (2 NO - 2 NC Available)

Temperature range: -13 F to +158 F (-25 C to 70 C)

Enclosure Rating: IP65 with plug-in connector, IP66 with terminal connections

Operating Rate: up to 120 operations per minute for diaphragm and 60 per minute for piston

Media connection: 1/4" NPT

Conduit connection: 1/2" NPT

Repeat accuracy: < 2%

Type XMLE

Type XMLE pressure switches and analog pressure sensors use ceramic technology measuring load

cells. The XMLE pressure switch incorporates a solid state NPN or PNP N/C output. Two potentiometers

allow for adjusting the setting of the rising pressure (PH) and falling pressure (PB) switching points.

The XMLE analog pressure sensor provides a 4-20 mA output proportional to the measuring range. A

digital display unit can be directly plugged in between the male and female DIN connectors. The display

may be adjusted to enable reading from any direction (360 orientation both vertically and horizontally).

The XMLE meets CE, IEC, CENELEC, and UL standards and has the following features:

Adjustable differential

Range listed is on increasing pressure

Temperature range: +5 F to +176 F (-15 C to 80 C)

Enclosure Rating: IP65 conforming to IEC529 Operating Rate: up to 50 operations per minute

Conduit connection: DIN43650A or M12

Fluid connections 1/4" NPT male

Type XMLA

Type XMLE

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Industrial Pressure SwitchesType XMLApplication and General Information

1998 Square D All Rights Reserved22

5/98

The XML pressure and vacuum switches control or regulate the pressure or vacuum in hydraulic or

pneumatic systems. They transform the pressure change into an electrical signal which, when a preset

pressure or vacuum level is reached, changes the state of an output contact.

Type XML switches with standard electrical contacts are designed for control of contactors, relays,

power valves, PLC inputs, and other electrical control devices.

Terminology

Operating Range

The difference between the minimum low point (PB) and the maximum high point (PH) setting values.

Size

Pressure Switches and Vacuum-Pressure Switches (Vacu-Pressure Switches) - Maximum value of the

operating range.

Vacuum Switches - Minimum value of the operating range.

Switching Point on Rising Pressure (PH)

Pressure Switches - The upper pressure setting at which the pressure switch will actuate the contactson rising pressure.

Vacuum Switches - The lower vacuum setting at which the vacuum switch will reset the contacts on

rising pressure.

Switching Point on Falling Pressure (PB)

The pressure at which the switch output changes state on falling pressure.

Fixed Differential (Type XMLA) - The lower point (PB) is not adjustable and is entirely dependent on the

high point setting (PH) and the natural differential of the switch.

Adjustable Differential (Type XMLB) - The adjustable differential enables the independent setting of the

lower point (PB).

Differential

The difference between the switching point on rising pressure (PH) and the switching point on falling

pressure (PB).

Accuracy (switches with setting scale)

The tolerance between the point at which the switch actuates its contacts and

the value indicated on the setting scale. Where very high setting accuracy is

required, it is recommended to use separate measuring equipment, such as

a pressure gauge.

Repeat Accuracy (R)The tolerance between two consecutive switching operations; usually

expressed as a percent of the set value.

+

Settingpoint

R

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Drift (F)

The tolerance of the switching point throughout the entire service life of the

switch.

Accidental Overpressure

The illustration depicts an accidental pressure surge of a very short duration (a few milliseconds). If

accidental overpressures occur and their duration is less than 50 milliseconds, the pressure damping

device incorporated in the XML switches (sizes 10 bar and greater) will diminish the effect.

Maximum Permissible Pressure per Cycle

The pressure which the switch can withstand, without detrimental effect, in each cycle throughout the

service life of the switch. The minimum value is at least equal to 1.25 times the switch size.

Maximum Permissible Occasional Surge Pressure

The permissible occasional surge pressure is al least 2.25 times the switch size.

Destruction Pressure

The maximum guaranteed pressure the switch will withstand before its destruction (bursting, rupturing,

component failure). This value is at least equal to 4.5 times the switch size.

F

300

bar

200

100

00 50 100 150

ms

without damping device

with damping device

0 50 100 1500

50

100

bar

ms

Example 1: with destructivepressure level.

Example 2: with destructivepressure level and destructivepressure oscillations.

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Detection of a Single Threshold as a Pressure Switch

The type XMLA switch is used for detection of a single threshold (fixed differential), having a single

adjustable setting point (PH).

Regulation between Two Thresholds as a Pressure Switch

The type XMLB switch is used for regulation between two thresholds (adjustable differential). It has both

a high setting (PH) and a low point setting (PB). Both points can be independently adjusted.

1

1 2

2 1 2

Pressure

Contact state

Time

Adjustable value

Non-adjustable valuePH

PH = High point

PB = Low point

PB

FixedDifferential

13

14

12

11

13

14

12

11

11 2

2 1 2

Pressure

Contact state

Time

Adjustable valuePH

PH = High point

PB = Low pointPB

Adjustable

Differential

13

14

12

11

13

14

12

11

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Detection of a Single Threshold as a Vacuum Switch

The type XMLA switch is used for detection of a single threshold (fixed differential), having a single

adjustable setting point (PH).

Regulation between Two Thresholds as a Vacuum Switch

The type XMLB switch is used for regulation between two thresholds (adjustable differential). It has both

a high setting (PH) and a low point setting (PB). Both points can be independently adjusted.

1 1 22 1 2

Vacuum

Contact state

TimeAdjustable value

Non-adjustable value

PH

PH = High point

PB = Low point

PB

Fixed

Differential

13

14

12

11

13

14

12

11

11 2

2 1 2

Vacuum

Contact state

Time

Adjustable value

PH

PH = High point

PB = Low point

PB

AdjustableDifferential

13

14

12

11

13

14

12

11

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Selection of Switch

After establishing the type of switch required for the application (single threshold detection or regulation

between two thresholds), the final selection will depend on the following criteria:

the differential

the maximum pressure permissible per cycle

the repeat accuracy, precision, and drift

The following is an example of a fixed differential pressure switch with detection of a single threshold.

The principle criterion is a minimum differential.

The following is an example of a fixed differential pressure switch with detection of a single threshold.

The principle criterion is tolerance to high overpressure.

Example: The following is an example of a fixed differential pressure switch with detection of a single

threshold. The principle criterion is repeat accuracy, precision, and minimum drift.

10 bar

0.6

XMLA010

Differential = 0.5 bar

Select an XMLA010 (the lowest differential)

Example: for a selected high point (PH) of 7 bar

XMLA020

Differential = 1 bar

XMLA035

Differential = 2 bar

7 6.5

20 bar

1

7 6

35 bar

1.5

75

45 bar


Select an XMLA035 (the highest surge pressure permissable)

XMLA020

Permissable occasionalsurge pressure = 45 bar

XMLA035

Permissable occasionalsurge pressure = 80 bar

1

12

2025

80 bar

1.5

12

35

45

20 bar


Select an XMLA035

XMLA020Adjustable, 1 to 20 bar

XMLA035Adjustable, 1.5 to 35 bar

1

1835 bar

As a general rule, working

at the upper or lower limitsof the operating range shouldbe avoided.

1.5

18

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Operating Curves for Detection of a Single Threshold (Fixed Differential)

Fallingpressure

Max.

+

Min.

00

Rising pressure

Defined by the difference betweenthe minimum low point (PB) and themaximum high point (PH) settingvalues.

For a high set point (PH), the lower

point (PB) is fixed and cannot beadjusted.For a low set point (PB), the higherpoint (PH) is fixed and cannot beadjusted.

The upper pressure setting at whichthe pressure or vacuum switch willactuate the contacts on risingpressure.

Adjustable throughout the range onrising pressure.

The pressure at which the switchoutput changes state on fallingpressure.

Switches with fixed differential (typeXMLA).

The lower point (PB) is not adjustableand is entirely dependent on the highpoint (PH) setting and the naturaldifferential of the switch.

PH - PB = natural differentialThe difference between the switchingpoint on rising pressure (PH) and theswitching point on falling pressure.

This point is not adjustable and therefore,the value of the differential is fixed.It is the natural differential of the switch(contact differential, friction, etc.)

Consider a switching point on risingpressure (PH) of 40 bar (set value at

which the contact will change state onrising pressure).It can be seen that the switching pointon falling pressure (PB) is 28 bar (fixedvalue at which the contact will return toits original state).

Adjustment rangeof low point (PB)

Adjustme

ntrange

ofhighpo

int(PH)

Falling pressure

Falling pressure

Falling pressure

Falling pressure

PH

+

PH

PB

PB

PH

PB

PB

00

Rising pressure

+

0

0

Rising pressure

PH

PH - PB

PB

+

0

0

Rising pressure

0 3 20

20

40

60

28 40 60 bar

bar

0

Rising pressure

}

Adjustment range

Switching point on

rising pressure (PH)

Switching point on

falling pressure (PB)

Differential

Example:

Conclusion: The differential will be 40 - 28 = 12 bar

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Operating Curves for Regulation Between Two Thresholds (Adjustable Differential)

Fallingpressure

Max.

+

Min.

00

Rising pressure

Defined by the difference betweenthe minimum low point (PB) and themaximum high point (PH) settingvalues.

The upper pressure setting at whichthe pressure or vacuum switch willactuate the contacts on risingpressure.

Adjustable throughout the range onrising pressure.

The pressure at which the switchoutput changes state on fallingpressure.

Switches with adjustabledifferential (type XMLB).The adjustable differential enablesthe independent setting of the lowerpoint (PB).

Low point < High pointPH - PB = maximum differentialPH - PB' = minimum differential

The difference between the switchingpoint on rising pressure (PH) and theswitching point on falling pressure.

Note: The low point can be set atany value between PB and PB'.

Consider a switching point onrising pressure (PH) of 20 bar(set value at which the contactwill change state on risingpressure).It can be seen that the switchingpointon falling pressure (PB) canbe between 4.5 and 17 bar,inclusive (set value at which thecontact will return to its originalstate).

Adjustment rangeof low point (PB)

Adjustm

entrange

ofhighpoint(PH)

Falling pressure

Fallingpressure

Falling pressure

PH

+

PH

PB PB'

PH

PB

00

Rising pressure

PB'

PB

PB'

+

0

0

Rising pressure

Fallingpressure

PB PB'

PH

PH - PB

PH - PB'

1 - Maximum differential

2 - Minimum differential

+

0

0

Rising pressure

0 4.5 10

10

20

30

2017 30 bar

bar

0

Rising pressure

}

Adjustment range

Switching point on

rising pressure (PH)

Switching point on

falling pressure (PB)

Differential

Example:

Conclusion: Max. differential

will be 20 - 4.5 = 15.5 bar Min. differential

will be 20 - 17 = 3 bar

1 2

1 2

1 2

1 2

PB PB'

1 2

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Component Materials in Contact with the Fluid

Materials in contact with the fluid

Pressure

or Vacuum Switch

Component materials in contact with the fluid

Zinc AlloyStainless

SteelBrass Steel Nitrile PTFE FPM Aluminum

XMLM01V, XMLM02V

XMLM01T, XMLM02T

XMLM03R

XMLM03S

XMLM03P

XMLM05A

XMLM05B

XMLM05C

XMLM05P

XMLL35R

XMLL35S

XMLL35P

XML001R

XML001S

XML002A

XML002B

XML002C

XMLA004A

XMLA004B

XMLA004C

XMLA004P

XMLB004A

XMLB004B

XMLB004C

XMLB004P

XML010A

XML010B

XML010C

XML010P

XML020A, XML035A

XML020B, XML035B

XML020C, XML035C

XML020P, XML035P

XML070D, XML160D

XML070E, XML160E

XML070N, XML160N

XML300D

XML300E

XML300N

XML500D

XML500E

XML500N

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Industrial Pressure SwitchesType XMLTechnical Overview


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Description

Operating principle, setting

Switches with fixed differential (XMLA)

Contact actuation point

As the fluid pressure rises, a force is transmitted through the transducer (diaphragm or piston)5 which

pushes against the spring 2. When this force is strong enough to overcome the spring pressure (as set

by compressing it, using adjustment knob 6), lever 4 pivots and operates the electrical contact 1.

Actuation of the contact 1 is obtained on a rising pressure at a point relates to the compression of spring

2 (as set by adjustment knob 6).

Contact reset point

As the fluid pressure falls enough for spring2 to push back on the transducer 5, its associated lever 4

pivots back and resets the contact 1. The reset pressure (non adjustable) will always be lower than the

actuation pressure, and the difference between them is the natural differential of the switch (contact

block differential travel and friction within the switch).

Switches with adjustable differential (XMLB)

Contact actuation point

As the fluid pressure rises, a force is transmitted through the transducer (diaphragm or piston)5 which

pushes against the spring2. When this force is strong enough to overcome the spring pressure

(adjustable by screw 6), the contact actuation lever 4 rises and the contact trips.

Actuation of the contact 1 is thus obtained on a rising pressure which corresponds to a value of pressure

related to the compression of spring 2 (as set by adjustment screw 6).

Contact reset point

As the fluid pressure falls enough for spring2 to push back on the transducer5, its associated lever4

descends and engages the push rod 8. The push rod transmits the opposing effort of the differential

(reset) spring 3 to the transducer. This opposing effort is set by adjusting the compression of spring 3(using adjustment screw 7). The differential adjustment is effectively added to the force created by the

decreasing pressure, thus helping to prevent the switch resetting. It is only when the combined efforts

of spring 3 + the system pressure are finally overcome by spring2 that the contact 1 will reset (as lever

4 descends).

For a pressure switch or vacu-pressure switch, the required trip pressure is set first (red adjustment

screw6) then the required reset pressure (green adjustment screw7).

For a vacuum switch, the required reset vacuum is set first (red adjustment screw6) then the required

trip vacuum (green adjustment screw 7).

1

5

2

6

3

4

8

7 1. Snap action contact block

2. Adjustment spring for switching point PH (rising

pressure)

3. Adjustment spring for differential setting (only

applicable to XMLB switches)

4. Contact actuation lever

5. Pressure transducer (diaphragm or piston) which

transforms the pressure into an actuating force

6. Adjustment screw (red) for setting switching point

PH

7. Adjustment screw (green) for setting differential

(only applicable to XMLB switches)

8. Push rod

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Industrial Pressure SwitchesType XMLSpecifications


SPECIFICATIONS

Environment

Conforming

to standards

Products IEC 947-5-1, EN 60 947-5-1, VDE 0660-200, UL 508, CSA C22-2 No. 14

Machineassemblies IEC 204-1, EN 60 204-1, NF C 79-130

Product certifications CSA B300 - R300, UL B300 - R300 Listed. (BV, GL, RINA, LROS pending)

Protective treatment Standard version TC. Special version TH

Ambient air temperature Operation: -25 C to +70 C. Storage: -40 C to +70 C

Fluids or products controlledHydraulic oils, air, fresh water, sea water (0 C to +160 C), depending on modelSteam, corrosive fluids, viscous products (0 C to +160 C), depending on model

MaterialsCase: zinc alloyComponent materials in contact with fluid: see page 29.

Operating position All positions

Vibration resistance4 gn (30 - 500 Hz) to IEC 68-2-6 except XML iL35iiiii, XMLi001iiiii andXMLBM03iiiii: 2 gn

Shock resistance50 gn conforming to IEC 68-2-27 except XMLiL35iiiii, XMLi001iiiii andXMLBM03iiiii: 30 gn

Electric shock protection Class I conforming to IEC 1140, IEC 536 and NF C 20-030

Degree of protection Screw terminal models: IP 66 conforming to IEC 529Connector models: IP 65 conforming to IEC 529

Operating rateOperating

cycle/min.

Piston version switches: 60 (for temperatures > 0 C)Diaphragm version switches: 120 (for temperatures > 0 C)

Repeat accuracy < 2%

Fluid connections Either 1/4" BSP female, G 1/4" or 1/4" NPTF (please consult your Regional Sales Office)

Electrical connections- Screw terminal models: Either tapped for No. 13 (DIN Pg 13.5) cable gland, tapped M20 or tapped1/2" NPT (consult your regional Sales Office)- Connector models: Either type DIN 43650A or M12 connector (please consult your Sales Office)

Contact block characteristics

Rated operational characteristicscAC-15: B300 (Ue = 240 V, Ie = 1.5 A - Ue = 120 V, Ie = 3 A)a DC-13: R300 (Ue = 250 V, Ie = 0.1 A) conforming to IEC 947-5-1 Appendix A, EN 60 947-5-1

Rated insulation voltageUi = 500 V degree of pollution 3 conforming to IEC 947-1 and VDE 0110, group C conforming toNF C 20-040Ui = 300 V conforming to UL 508, CSA C22-2 No. 14

Rated impulse withstand voltage U imp = 6 kV conforming to IEC 947-1, IEC 664

Contact operation 1 C/O single-pole (4 terminal) snap action contact. Silver contacts

Resistance across terminals m < 25 conforming to NF C 93-050 method A or IEC 255-7 category 3

Terminal referencing Conforming to CENELEC EN 50013

Short-circuit protection 10 A cartridge fuse type gG (gl)

Cabling Screw clamp terminals. Clamping capacity, min.: 1 x 0.2 mm2, max.: 2 x 2.5 mm2

Electrical durabilityconforming to IEC 947-5-1 Appendix CUtilization categories AC-15 and DC-13Operating rate: 3600 operating cycles per hourLoad factor: 0.5

0.3 0.5 1 2 5 10 200.1

0.2

0.5

1

2

345

7

Millionsofoperatingcycles

220 V 127 V

lth

48 V

AC supply at 50/60 Hz DC supplyPower broken in Wfor 1 million operating cycles

Voltage V 24 48 120

W 31 29 26

Inductive circuit Ith = 10 A

Current in A

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Industrial Pressure SwitchesType XMLDimensions


5/98

6.12155.5

1.5740

0.79

20

0.79

20

5.7

1

145

2.2

056

2.5

665

0.3

910

(3)

(4)

3.17

80.5(1)

XMLBM03

(2)

(1) Fluid entry, 1/4" NPT female

(2) Electrical connections entry, tapped for 13 mm cable gland(3) 2 elongated holes 0.4 x 0.2 in ( 10.2 x 5.2 mm)(4) 1 elongated hole 0.6 x 0.2 in ( 15.2 x 5.2 mm)

5.2

2

.22

5

6.5

6.3

8

162

0.6

717

4.33 110

1.77450.43

110.4311

2.24

57

(1)

(1) Fluid entry, 1/4" NPT(2) Electrical connections entry, tapped for 13 mm cable gland

XMLL35, XML001

0.266.5

(2)

Dual Dimensions inchesmm

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Industrial Pressure SwitchesType XMLDimensions


3.4

1

86.5

6.8

9

175

4.33 110

2.1755

(1)

(1) Fluid entry, 1 1/4" NPT female(2) Electrical connections entry, tapped for 13 mm cable gland

XMLBL35P

(2)

1.9750

5.1

2

130

2.1

354

2x0.22x5.2

(2)

2.9976

1.3835

0.9825

(1)

1.4637

0.25

1.97

50

(1) Fluid entry, 1 1/4" NPT female(2) Electrical connections entry, tapped for 13 mm cable gland

XMLBM05P, XMLA004P, XML010P, XML020P, XML035P

Dual Dimensions inchesmm

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Industrial Pressure SwitchesType XMLASelection


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The Type XMLA is a single pole, fixed differential pressure or vacuum switch. It is specified by selecting

the range, actuator, setting scale, connector, and output.

In this example, a Type XMLA switch is specified with a range of 8.7 to 145 psi, a diaphragm rated for

oil/water/air at 70 C (non-corrosive), a setting scale, without a connector, and contacts for the output.

The following tables detail the information required to properly select a Type XMLA pressure or vacuum

switch for the desired application.

Class Type Range Actuator Setting Scale Connector Output Threads

XML A 010 A 2 S 1 3

Range (on increasing pressure)

Range Code

-4.06 to -14.5 psi M01

0.435 to 14.5 psi 001

2.17 to 36.25 psi 002

5.8 to 58 psi 004

8.7 to 145 psi 010

10.2 to 290 psi 020

21.75 to 507.5 psi 035

72.5 to 1015 psi 070

145 to 2320 psi 160

290 to 4350 psi 300

435 to 7250 psi 500

Actuator

Pressure

Switch

Type

Range

CodeFluids Controlled

Actuator

Code

Diaphragm

M01

Hydraulic oils, fresh water, seawater, air, up to 70 C

V

Hydraulic oils, fresh water, seawater, air, corrosive fluids, up to 160C

T

001

Hydraulic oils, air, up to 160 C R

Fresh water, sea water, corrosivefluids, up to 160 C

S

002004010020035


A


B

Corrosive fluids, up to 160 C C

004010020035

Viscous products, up to 70 C P

Piston

070

160300500

Hydraulic oils, up to 160 C D

Fresh water, sea water, up to 160 C E

Corrosive fluids, air, up to 160 C N

Setting Scale

Description Code

Without setting scale 1

With setting scale 2

Connector

Description Code

D12 micro connector D

Square C

Without connector S

Output

Description Code

Contacts 1

Threads

Description Code

1/4" NPT 3

File E164865 CCN NKPZ

File LR 44087 Class 3211 03

Type XMLA

terminal connection

with setting scale

Type XMLA

DIN connector with

setting scale

Type XMLA

terminal connection

without setting scale

Type XMLA

DIN connector

without setting scale

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Industrial Pressure SwitchesType XMLASelection


Add to PB to give PH

Subtract from PH to give PB

Additional Specifications for Type XMLA Pressure and Vacuum Switches

Type

Differential Maximum permissible pressureDestruction

pressure

(psi)

Mechanical life

(operating

cycles)At low setting

(psi)

At high setting

(psi)

Per cycle

(psi)

Occasional

surge

(psi)

XMLAM01 3.48 0.72 3.48 0.72 72.5 130.5 261 3 x 106

XMLA001 0.29 0.14 0.58 0.14 18.12 32.62 65.25 4 x 106

XMLA002 1.88 0.43 1.88 0.43 72.5 130.5 261 8 x 106

XMLA004 5.07 0.43 5.07 0.43 72.5 130.5 261 8 x 106

XMLA010 7.25 0.72 7.25 0.72 181.25 326.25 652.5 5 x 106

XMLA020 5.8 1.45 14.5 1.45 362.5 652.5 1305 5 x 106

XMLA035 18.12 3.62 18.12 3.62 652.5 1160 2320 5 x 106

XMLA070 43.5 11.6 108.75 11.6 1305 2320 4640 6 x 106

XMLA160 79.75 14.5 261 43.5 2900 5220 10440 6 x 106

XMLA300 239.25 43.5 507.5 87 5437.5 9787.5 19575 3 x 106

XMLA500 290 87 652.5 145 9062.5 16312.5 32625 3 x 106

3

2

1

1 2

3

11 and 13

Switch connector pin viewConnector model

12

14

13

14

12

11

ConnectionsTerminal model

XML A

Documents

Transcript of XML A