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MoML element can be used to specify a relative or absolute URL pointing to a file that configures the entity, or it can be used to include the configuration information in line. That information need not be MoML information. It need not even be XML, and can even be binary encoded data (although binary data cannot be in line; it must be in an external file). For example, Here, url can give the name of a file containing data, or a URL for a remote file. (For the Sequence- Plotter actor, that external data will have PlotML syntax; PlotML is another XML schema for configuring plotters.) Configure information can also be given in the body of the MoML file as follows: configure information With the above syntax, the configure information must be textual data. It can contain XML markup with only one restriction: if the tag “” appears in the textual data, then it must be preceeded by a matching “”. That is, any configure elements in the markup must have balanced start and end tags. 4 You can give both a source attribute and in-line configuration information, as in the following: configure information In this case, the file data will be passed to the application first, followed by the in-line configuration data. In Ptolemy <strong>II</strong>, the configure element is supported by any class that implements the Configurable interface. That interface defines a configure() method that accepts an input stream. Both external file data and in-line data are provided to the class as a character stream by calling this method. There is a subtle limitation with using markup within the configure element. If any of the elements within the configure element match MoML elements, then the MoML DTD will be applied to assign default values, if any, to their attributes. Thus, this mechanism works best if the markup within the configure element is not using an XML schema that happens to have element names that match those in MoML. Alternatively, if it does use MoML element names, then those elements are used with their MoML meaning. This limitation can be fixed using XML namespaces, something we will eventually 4. XML allow markup to be included in arbitrary data as long as it appears within either a processing instruction or a CDATA body. However, for reasons that would only baffle anyone familiar with modern programming languages, processing instructions and CDATA bodies cannot be nested within one another. The MoML configure element can be nested, so it offers a much more flexible mechanism than the standard ones in XML. 202 Ptolemy <strong>II</strong>
MoML implement. 7.3.7 Doc Element Some elements can be documented using the doc element. For example, Initialize the ramp above the default because... This actor produces an increasing sequence beginning with 5. With the above syntax, the documentation information must be textual data. It can include markup, as in the following example, which uses XHTML 5 formatting within the doc element: Using HTMLText with markup. An alternative method is to use an XML processing instruction as follows: This requires that any utility that uses the documentation information be able to handle the xhtml processing instruction, but it makes it very clear that the contents are XHTML. However, for reasons we do not understand, XML does not allow processing instructions to be nested, so this technique has its limitations. More than one doc element can be included in an element. To do this, give each doc element a name, as follows: doc contents The name must not conflict with any preexisting property. If a doc element or a property with the specified name exists, then it is removed and replaced with the property. If no name is given, then the doc element is assigned the name “_doc”. 5. XHTML is HTML with additional constraints so that it conforms with XML syntax rules. In particular, every start tag must be matched by an end tag, something that ordinary HTML does not require (but fortunately, does allow). Heterogeneous Concurrent Modeling and Design 203
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PTOLEMY II HETEROGENEOUS CONCURRENT
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VOLUME 1 INTRODUCTION TO PTOLEMY II
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Volume 1 Contents Introduction to P
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2.10.3. Constructing Modal Models 8
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7. MoML 191 7.1. Introduction 191 7
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1 Introduction Author: Edward A. Le
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Introduction heterochronous dataflo
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Introduction A major emphasis in Pt
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Introduction determine when actors
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Introduction provides levels of vis
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Introduction is a guard, and the se
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Introduction well. All of these are
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Introduction clients to update thei
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Introduction will be supplied with
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Introduction 1.3.12 Synchronous Dat
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Introduction FIGURE 1.10. Refinemen
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Introduction occlusions due to terr
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Introduction tion. The overall arch
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Introduction kernel.attributes This
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Introduction 1.5.2 Overview of Key
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Introduction Actor interfaces are k
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Heterogeneous Concurrent Modeling a
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Introduction actor actor.gui data.e
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Introduction cient, scalable, and u
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Introduction 1.5.8 Future Capabilit
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Introduction Appendix A: UML — Un
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Introduction grams, the only constr
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2 Using Vergil Authors: Edward A. L
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Using Vergil 2.2.2 Executing a Pre-
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Using Vergil The Lorenz attractor m
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Using Vergil The Continuous-Time (C
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Using Vergil box in figure 2.11. En
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Using Vergil Don’t panic! Excepti
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Using Vergil tions are a normal par
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Using Vergil 2.4 Hierarchy Ptolemy
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Using Vergil Then using these ports
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Using Vergil the default 0.1 to 0.0
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Using Vergil pan window, it is easy
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Using Vergil FIGURE 2.33. The pan w
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Using Vergil we have modified the c
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Using Vergil model, simply copy (or
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Using Vergil A key issue is to deci
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Using Vergil instances. This proble
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Using Vergil quick tour for more de
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Using Vergil uses the index in the
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Using Vergil AddSubtract actor, and
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Using Vergil If you look inside the
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Using Vergil If you look inside the
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Using Vergil transition (or right c
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Using Vergil Once you have created
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Using Vergil The grid is turned off
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Authors: Edward A. Lee Xiaojun Liu
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Expressions classes to create a gen
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Expressions The % operation is a mo
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Expressions attribute, which includ
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Expressions 3.3.5 State Machines Ex
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Expressions whose value is an array
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Expressions from it. For instance,
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Expressions defined. For example, >
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Expressions length is given by the
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Expressions Thus, for example, you
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Expressions number. With one additi
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Expressions value. For example, fix
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Expressions In the example in figur
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Expressions A.2 Basic Mathematical
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Expressions A.3 Matrix, Array, and
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Expressions A.5 Signal Processing F
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Expressions TABLE 8: Functions perf
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4 Actor Libraries Authors: Elaine C
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Actor Libraries properly in the CT
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Actor Libraries ing that multiple c
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Actor Libraries TypedAtomicActor «
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Actor Libraries SequenceScope (exte
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Actor Libraries UnsignedByteArrayTo
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Actor Libraries MobileFunction (ext
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Actor Libraries LogicFunction (exte
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Actor Libraries Sleep (extends Tran
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Actor Libraries VariableFIR (extend
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Actor Libraries Integrator: Integra
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Actor Libraries Figure 4.4 shows th
Page 161 and 162: 5 Designing Actors Authors: Christo
Page 163 and 164: Designing Actors /** Javadoc commen
Page 165 and 166: Designing Actors although with most
Page 167 and 168: Designing Actors import ptolemy.act
Page 169 and 170: Designing Actors makes such actors
Page 171 and 172: Designing Actors same parameter val
Page 173 and 174: Designing Actors morphic actor comp
Page 175 and 176: Designing Actors To get data polymo
Page 177 and 178: Designing Actors public class Seque
Page 179 and 180: Designing Actors be used in domains
Page 181 and 182: Designing Actors alComm actor. Beca
Page 183 and 184: Designing Actors attribute has valu
Page 185 and 186: Designing Actors import ptolemy.act
Page 187 and 188: 6 Coding Style Authors: Christopher
Page 189 and 190: Coding Style /* One line descriptio
Page 191 and 192: Coding Style Copyright (c) 2004 The
Page 193 and 194: Coding Style @version $Id: NamedObj
Page 195 and 196: Coding Style } We use instead the i
Page 197 and 198: Coding Style * @exception MyExcepti
Page 199 and 200: Coding Style + "it does not impleme
Page 201 and 202: Authors: Edward A. Lee Steve Neuend
Page 203 and 204: MoML cutes it forever, until you hi
Page 205 and 206: MoML A second difference between ou
Page 207 and 208: MoML
Page 209 and 210: MoML 7.3.3 Names and Classes Most M
Page 211: MoML Here, the element named
Page 215 and 216: MoML It is also sometimes necess
Page 217 and 218: MoML then there will be a link t
Page 219 and 220: MoML found. For example, if the cla
Page 221 and 222: MoML it cannot collide with the nam
Page 223 and 224: MoML The rendering of the icon is d
Page 225 and 226: MoML 7.4.5 Deleting Entities, Relat
Page 227 and 228: MoML This unlinks a port from the s
Page 229 and 230: MoML model. The EntityLibrary class
Page 231 and 232: MoML Suppose that using incremental
Page 233 and 234: MoML Generate a sine wave.
Page 235 and 236: MoML
Page 237 and 238: MoML Number of iterations in
Page 239 and 240: MoML -P- The f
Page 241 and 242: MoML -P- The phase,
Page 243 and 244: 8 Custom Applets Authors: Edward A.
Page 245 and 246: Custom Applets html code, see the J
Page 247 and 248: Custom Applets public class Tutoria
Page 249 and 250: Custom Applets then the result of
Page 251 and 252: Custom Applets 8.3.5 Using Model Pa
Page 253 and 254: Custom Applets ptolemy/domains/doma
Page 255 and 256: References [1] G. Agha, Actors: A M
Page 257 and 258: [33] S. A. Edwards, “The Specific
Page 259 and 260: [67] E. Kohler, The Click Modular R
Page 261 and 262: [95] J. Liu, X. Liu, T. J. Koo, B.
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[132]W. R. Sutherland, "The on-Line
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Glossary abstract syntax ..........
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Ptolemy II ........................
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Index Symbols - in UML 41 # in UML
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coin flips 142 Color class 173 colo
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entity in XML 198 EntityLibrary cla
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Director class 159 inverse FFT 124
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CompositeEntity class 206 nextPower
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safety 34 SampleDelay actor 78, 138
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type constraint 155 type constraint
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